Carrier 48EN Manual

INSTALLATION, OPERATION AND

MAINTENANCE INSTRUCTIONS

48EN/EH

Nominal cooling capacity 58,9 - 135,5 kW

Nominal heating capacity 62,2 - 143,4 kW

50 Hz

Packaged rooftop cooling only / heat pumps

with integrated gas burner

Original document

Packaged rooftop units

with integrated gas burner

Contents

1. Introduction .......................................................................................................................................................................................................3

2. Operation limits.................................................................................................................................................................................................3

3. Technical characteristics...................................................................................................................................................................................4

4. General recommendations................................................................................................................................................................................5

Delivery of the unit ............................................................................................................................................................................................5

Unit identiﬁcation...............................................................................................................................................................................................5

Documentation provided...................................................................................................................................................................................5

Location.............................................................................................................................................................................................................5

Installation.........................................................................................................................................................................................................5

Unit maintenance..............................................................................................................................................................................................5

Safety advice.....................................................................................................................................................................................................5

Refrigerant safety..............................................................................................................................................................................................6

Burner safety.....................................................................................................................................................................................................6

5. Transport...........................................................................................................................................................................................................6

Gravity centre....................................................................................................................................................................................................7

6. Location and assembling ..................................................................................................................................................................................7

Location designation.........................................................................................................................................................................................7

Sound Level......................................................................................................................................................................................................7

Anchorage for antivibrators...............................................................................................................................................................................8

Minimum free space for commissioning and maintenance operations .............................................................................................................8

7. Gas Burner........................................................................................................................................................................................................9

Operating principle............................................................................................................................................................................................9

Control of the gas burner ................................................................................................................................................................................10

8. Safety elements ..............................................................................................................................................................................................11

Safety devices in the gas burner.....................................................................................................................................................................11

Safety devices in the 48EN/EH unit................................................................................................................................................................12

9. Checking before commissioning.....................................................................................................................................................................13

Electrical Connections.....................................................................................................................................................................................13

Gas Burner......................................................................................................................................................................................................13

Air ducts connections......................................................................................................................................................................................15

Checks in the axial fans...................................................................................................................................................................................15

Checks in the centrifugal fans.........................................................................................................................................................................15

Condensate drain connection .........................................................................................................................................................................16

10. Starting the unit...............................................................................................................................................................................................17

Checks prior to commissioning.......................................................................................................................................................................17

Operational checks .........................................................................................................................................................................................17

Possible problems at commissioning..............................................................................................................................................................17

11. Options ............................................................................................................................................................................................................18

Pre-assembly frames (optional)......................................................................................................................................................................18

Outdoor coil protection grille ...........................................................................................................................................................................18

Filters ..............................................................................................................................................................................................................18

Stop-drop ........................................................................................................................................................................................................18

12. Maintenance....................................................................................................................................................................................................19

13. Control and analysis of breakdowns................................................................................................................................................................22

Packaged rooftop units

with integrated gas burner

1. INTRODUCTION

2. OPERATION LIMITS

The 48EN/EH cooling units and heat pumps are autonomous air-air

units with a compact monoblock, horizontal rooftop design with a built

in natural or propane gas burner (in accordance with the gas Directive

90/396 EEC).

They are equipped with centrifugal and axial fans, air coils, hermetic

scroll compressors and electronic control with microprocessor,

components optimised for the R-410A refrigerant.

Theseunits havebeen designedfor theair conditioningof largesurface

areasused forbusinessorindustryin areaswith particularlylowoutdoor

temperatures in winter.

A vast number of options meet numerous operating demands thus

enabling quick installation and reliable operation.

Space 48EN Series

Autonomous air-air cooling units with a compact horizontal rooftop

design with a built in gas burner.

Space 48EH Series

Autonomous reversible air-air heat pump units with a compact

horizontal rooftop design with a built in gas burner.

After manufacturing, all units are charged with refrigerant and

are tested at the factory, verifying the correct operation of all

their components.

In this brochure are described the actions and safety norms for a

correct unit handling.

With a condensation pressure control operating down to -10ºC.

With high powered axial fan operating up to 52ºC.

With outdoor temperatures below -15ºC it is compulsory to select the anti-freeze

protection option for the electric panel.

Inlet air conditions Cooling Heating

Indoor coil

heat pump

Minimum 14ºC WB 10ºC

Maximum 22ºC WB 27ºC

Outdoor coil

heat pump

Minimum 12ºC -10ºC WB

Maximum 48ºC 15ºC WB

Gas Burner Minimum -- -30ºC 

Packaged rooftop units

with integrated gas burner

3. TECHNICAL CHARACTERISTICS

Cooling capacity calculated in accordance with the EN-14511 standard given for indoor temperature conditions 27ºC, 50% RH and 35ºC outdoor temperature.

Heating capacity calculated in accordance with the EN-14511 standard given for indoor temperature conditions 20ºC and 6ºC WB outdoor temperature.

Total power input by compressor and motorised fans under nominal conditions, calculated in accordance with the EN-14511 standard.

Climatic warming potential of a kilogram of ﬂuorinated greenhouse gas in relation to a kilogram of carbon dioxide over a period of 100 years.

48EN/EH 241 321 361 242 322 362 420 485 540 600

Cooling

capacities

Cooling capacity (kW) 58,9 72,1 82,7 60,3 73,6 84,8 101,7 110,3 123,3 135,5

Power input (kW) 21,4 28,1 32,7 21,1 27,5 32,0 33,0 37,0 42,8 49,8

EER performance 2,7 2,6 2,5 2,9 2,7 2,6 3,1 3,0 2,9 2,7

Heating

capacities

Heating capacity (kW) 62,2 76,7 92,3 62,2 76,1 91,6 105,5 115,5 129,0 143,4

Power input (kW) 18,2 21,8 26,6 17,4 20,9 25,5 31,2 35,3 39,1 43,6

COP performance 3,4 3,5 3,5 3,6 3,6 3,6 3,4 3,3 3,3 3,3

Outdoor circuit

fan

Nominal air ﬂow (m3/h) 30.000 42.000

Available static pressure (mm.w.c) 4

Type Axial

Number 24

Diameter (mm) 2 x 800 2 x 630 + 2 x 800

Output (kW) 2 x 2,0 / 1,3 2 x 0,7 / 0,4 + 2 x 2,0 / 1,3

Speed (r.p.m.) 895 / 685 875 / 650

895 / 685

Outlet fan

indoor

circuit

Nominal air ﬂow (m3/h) 12.000 14.300 15.900 12.000 14.300 15.900 18.000 18.200 20.400 24.000

Available static pressure (mm.w.c) 12 12 12 12 12 12 12 12 15 15

Type Centrifugal

Number / no. turbines 2 / 2

Motor output (kW) 2 x 1,5 2 x 2,2 2 x 3 2 x 1,1 2 x 2,2 2 x 2,2 2 x 2,2 2 x 2,2 2 x 3 2 x 4

Power input (kW) 2 x 1,13 2 x 1,67 2 x 2,11 2 x 0,93 2 x 1,35 2 x 1,68 2 x 1,70 2 x 1,74 2 x 2,40 2 x 3,42

Speed (r.p.m.) 847 939 995 762 829 870 708 713 790 860

Compressor

Type Scroll

Number of compressors 2

Number of circuits 2

Number stages 2

Oil type Copeland 3MAF 32cST, Danfoss POE 160SZ, ICI Emkarate RL 32CF, Mobil EALArtic 22CC

Volume of oil (l) 2 x 3,3 2 x 3,3 2 x 6,2 2 x 3,3 2 x 3,3 2 x 6,2 2 x 6,2 2 x 6,2 2 x 6,2 2 x 6,2

Gas

burner

Gas type Natural or propane

Standard model PCH-72 PCH-200

Max. heating capacity (kW) 73 197

Pressure drop (mm.w.c) 11,4 16,2 20,0 5,7 8,1 10,0 12,8 13,1 16,5 22,8

Electrical

features Electrical power supply 400 V / III ph / 50 Hz (±10%)

Power supply 3 Wires + Ground

Maximum

absorbed

current

Compressor(s) (A) 58,0 70,0 72,0 58,0 70,0 72,0 87,0 102,0 116,0 130,0

Outdoor fan(s) (A) 8,6 8,6 8,6 8,6 8,6 8,6 11,2 11,2 11,2 11,2

Indoor fan (A) 7,2 10,0 13,8 5,4 10,0 10,0 10,0 10,0 13,8 18,0

Control (A) 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0

Total (A) 75,8 90,6 96,4 74,0 90,6 92,6 110,2 125,2 143,0 161,2

Refrigerant

Type R-410A

Global warming potential (GWP) 2.088

Charge (kg) 18,4 19,8 27,0 18,8 20,1 27,4 42,5 42,4 51,0 51,0

Environment impact (tCO2eq) 38,4 41,3 56,4 39,3 42,0 57,2 88,7 88,5 106,5 106,5

Dimensions

Length (mm) 3.326 3.926 4.816

Width (mm) 2.205 2.205 2.205

Height (mm) 2.095 2.095 2.095

Weight (kg) 1.497 1.581 1.717 1.723 1.806 1.942 2.360 2.402 2.459 2.512

Condensates output Ø 1 1/4” adaptor

Packaged rooftop units

with integrated gas burner

Unit identiﬁcation

All units bear, legibly and indelibly, a data plate located in a prime

space, with the following data:

4. GENERAL RECOMMENDATIONS

For the gas burner the unit includes a second nameplate with its

features:

Note: The serial number mustbe used in allcommunications

regarding the unit.

Delivery of the unit

Check the condition of the equipment upon delivery. Check that the

details on the label, the packing and the rating plate match the order.

If equipment has been damaged, or there is a shortfall in delivery,

notify accordingly.

Documentation provided

The following documentation is provided with the 48EN/EH unit:

- This brochure for the installation, operation and maintenance.

- Electrical diagram: this diagram must be consulted for the electrical

connections of the 48EN/EH unit.

- CARRIERrtc electronic control brochure.

- Communicationsbrochure for theCARRIERrtc electroniccontrol(in

case the 48EN/EH unit is connected to a pLAN network or to a BMS

monitoring system).

- Manufacturer'sinstallationandmaintenancebrochure(APENGROUP)

for the burners in the PCH series.

- CE marking certiﬁcate.

- CARRIER warranty document.

Unit maintenance

The unit is to be inspected annually by a qualiﬁed technician. He will

check all the gas and electrical connections and make sure that the

burner motor and safety devices and control systems are in good

working order.

Attention: In compliance with the requirements of the Gas

Directive90/396 EECitisstrictlyprohibited toaltertheburner

or the electronic control unit.

Installation

The 48EN/EH units with built-in gas burner are to be installed in

accordancewith the applicablegas unitregulationsand normsin force

in the country of use.

Check that the supply, type, pressure and ﬂow rate of the gas are

compatible with the speciﬁcations on the burner rating plate. For

safety and maintenance purposes, ensure that the aforementioned

speciﬁcations are observed.

Safety advice

To avoid accidents during installation, commissioning or maintenance,

it is required to take into consideration the units specifications:

refrigerated circuits under pressure, refrigerant presence, voltage

presence and implantation.

Because of all of this, only qualiﬁed and experienced personnel can

perform maintenance tasks or unit repairs.

Itis requiredtofollow therecommendations andinstructions

in the maintenance brochures, the labels, and the speciﬁc

instructions. It is necessary to comply with the norms and

regulations in effect.

The compressor surfaces, the lines and hot components on

thegas burnercanreachtemperaturesabove100ºC, causing

physical burns. In the same fashion, under certain conditions

these surfaces can reach very cold temperatures that can

cause freezing risks.

Use safety gloves and gloves whilst working. Be careful with

sharp parts or elements in the unit.

V-220005

V-220004

Caution: Before intervening in the unit, verify that the main

power to the unit is cut off. An electric shock can cause

personal damage.

Note: In order to recycle these units follow the stipulations

of directives (EC) No. 96/2002 and No. 108/2003 regarding

electrical and electronic equipment and the management of

the resulting waste.

Location

These units are prepared for rooftop installation. Make sure they are

not ﬁtted near areas where there is a risk of ﬁre (ﬂammable dust)

or explosion, or in areas where aggressive products are kept, e.g.

trichloroethylene, perchloric acid, etc.

An.Year

CARRIER SCS

Route de Thil

01122 Montluel–France

Tél: 33(0)4 72 25 21 21

Ref. Produit\Item Nb

Designation\Description

Refrigerant kW Absorbee\Input Poids\Weight

Refrigerant kg Tension\Voltage Temperature Maxi C

BP Mini PSM\MOP Intensité\Current A IP

HP Maxi PSM\MOP Int. Kit Elect. No CE

0056

No Serie\Serial Nb

No Produit

Contains fluorinated greenhouse gases regulated by the Kyoto protocol

UTC BIS

P.I. Llanos de Jarata

14550 Montilla - SPAIN

Phone: 34 957 65 23 11

Made in Spain

COUNTRY

m3/h

GAS INFORMATION

GAS CONSUMMATION

GAS

GAS CATEGORY

GAS PRESSURE

TYPE

mbar

CE certification

number of unit

with gas burner

Packaged rooftop units

with integrated gas burner

5. TRANSPORT

The unit must be handled with care to avoid transport damage. Thus

we recommend:

- For transport in a container, one must be selected that has an easy

load and unload to the installation location.

- Do not dispose of the pallet or the packaging materials until the unit

is in its ﬁnal location.

Note: the skis for closed container transport can be removed by

unscrewing them from the unit struts.

- The unit can be handled with a forklift truck, taking all necessary

precautions to avoid sliding of the unit on the truck's fork.

- The unit must be lifted and ﬁxed with care and without inclination

(maximum inclination 15º), since it could harm its operation. Please

refer to the gravity centre coordinates of each model in accordance

with the assembly.

- For the transport and lifting to the roof using a crane cloth slings

with rings will be used, with the

appropriate resistance, separated

by a strut to avoid damaging the

casing. These slings are attached

to the grips on the strut.

Detail lifting grip

Ski for the container

Refrigerant leaks:

- Toxicity:Accordingto ASHRAE34,R-410AbelongstotheA1/A1group

with high safety both in the mix and also in the case of a leak.

- Although it is not toxic, in case of a leak to atmospheric pressure the

liquid phase evaporates. The resulting vapours are heavier than air

and can displace the technician local air. In case of an accidental

dischargein a closedenclosure, fansmust be usedto eliminatesaid

vapours.

- Although the R-410A is not ﬂammable, when in contact with a ﬂame

or hot spot it can decompose thus producing ﬂuorhydric acid HF and

ﬂuophosgene COF2which are highly toxic and corrosive.

- To detect leaks, an electronic leak detector, an ultraviolet lamp or

soapy water must be used . Flame detectors do not help.

Note: Repair immediately any refrigerant leak, using

recovery unit speciﬁc for R-410A that avoids a possible

mixture of refrigerants and/or oils.

Refrigerant safety

A periodical check must be performed for refrigerant gas leaks as per

Regulation (CE) Nº842/2006 over certain greenhouse effect ﬂuoride

gases.

R 410A

These units work with refrigerant gas

Components R-32 R-125

Chemical formula CH2F2 CHF2CF3

Weight ratio 50% 50%

Unitary global warming potential (GWP) 675 3.500

Global warming potential (GWP) 2.088

Natural or propane gas leaks in the burner:

- Do not operate electric switches or other objects which could cause

sparks.

- Close the gas supply valve.

- Improve the ventilation if the burner is located in a closed area.

- Ensure that there is no one in the vicinity of the leak and request the

intervention of site staff.

Burner safety

The gas burner has a built-in maximum safety system which cuts off

the supply of gas to the burner should the ﬂame go out. Ensure that

no objects impair the supply of air to the burner.

Note: If the generator is not going to be used over a

prolonged period the gas supply valve must be closed.

Grip

Attention: Check that the grips are perfectly screwed in before

attaching the slings.

- After the placing of the unit, it is recommended to remove the grips

as they can be a hindrance for maintenance. Put them back in case

of unit transport.

Packaged rooftop units

with integrated gas burner

48EN/EH Assembly Centre of gravity (mm) Weight 

(kg)

XYZ

241

MO 1062 1310 830 1497

MS 1127 1355 832 1578

MA/ MC0 1193 1385 804 1705

321

MO 1062 1310 830 1581

MS 1127 1355 832 1662

MA/ MC0 1193 1385 804 1789

361

MO 1062 1310 830 1717

MS 1127 1355 832 1798

MA/ MC0 1193 1385 804 1925

242

MO 1100 1300 845 1723

MS 1165 1345 847 1805

MA/ MC0 1223 1386 776 1925

322

MO 1100 1300 845 1806

MS 1165 1345 847 1888

MA/ MC0 1223 1386 776 2008

362

MO 1100 1300 845 1942

MS 1165 1345 847 2024

MA/ MC0 1223 1386 776 2144

420

M0 1024 2300 794 2360

MS 1085 2353 804 2458

MA/ MC0 1186 2469 746 2724

485

M0 1024 2300 794 2402

MS 1085 2353 804 2500

MA/ MC0 1186 2469 746 2766

540

M0 1024 2300 794 2459

MS 1085 2353 804 2557

MA/ MC0 1186 2469 746 2823

600

M0 1024 2300 794 2512

MS 1085 2353 804 2610

MA/ MC0 1186 2469 746 2876

The unit weight includes the burner installed as standard which matches the

heaviest one amongst those available.

Location designation

Beforemoving theunit,make surethat allpanels arefastened in place.

Lift and lower with care.

When choosing the location, in any way the selected fashion, the

following precautions have to be taken into consideration:

- It is mandatory to comply with norm EN 378-3 on Safety and

Environmental Requirements. Part 3: "In situ" installation and

protection to people.

- The area where the unit will be located must be perfectly accessible

forcleaning andmaintenance operations(checkminimumfreespace

formaintenance).Leave enoughspace for aircirculation around the

unit.

- Foresee appropriate damping devices throughout the installation to

ensure that noise and vibration transmission is avoided (refer to the

section "Anti-vibration Anchoring").

- Check that the structure can withstand the weight of the unit.

- Sincethe unitis designedto workoutdoors,somespeciﬁcinstallation

norms must be followed:

• The unit will be located on the roof of the premises. If it is foreseen

that it will work more on heating than on cooling, it is preferable to

direct the coil towards the sun. If little work on heating is foreseen,

choose North direction.

• Avoidplacing obstaclesin theair outletor return.Noobstacle may

impede the air aspiration into the coils. Do not ﬁx the outdoor coil

side in the predominant wind direction.

• Do not install the unit in a closed enclosure or in conditions that

originate air recirculation.

• Thechosen locationmustnot ﬂoodandmust beabove theaverage

height the snow reaches in that region.

• All models can be installed on the ﬂooror ona brick frameor steel

proﬁle (see optional preassembly frames in chapter 11). In any

case, check that the unit is perfectly level.

6. LOCATION AND ASSEMBLING

Sound Level

These units are designed to work with a low acoustic level. In any case,

in the design of the installation the outdoor environment, the kind of

building for the noisetransmitted in the airand the solid elements forthe

vibration transmission must be taken into consideration for the acoustic

radiation. If necessary, commission a study by an acoustic technician.

Sound power level

Note: The sound power spectrums can be consulted in the technical brochure

for the 48EN/EH series.

Sound pressure level

Measurement conditions: in free ﬁeld, measured at a distance of 5

metres, directivity 2 and at 1.5 metres from the ground.

Note: Thesoundpressurelevel dependsontheinstallation conditionsand,assuch,

it only indicated as a guide. Values obtained according to the ISO 3744 standard.

48EN/EH 241 321 361 242 322 362 420 485 540 600

Total dB(A) 90 90 91 88 88 89 94 95 95 95

48EN/EH 241 321 361 242 322 362 420 485 540 600

Total dB(A) 63 63 64 61 61 62 67 67 67 67

Gravity centre

Packaged rooftop units

with integrated gas burner

Anchorage for antivibrators

Whenselecting antivibration mountsboth theunit weightand reactions

in the supports must be taken in account and are featured in the

following table.

48EN/

EH Assembly A

(mm) B

(mm) Reactions in the supports (kg) Weight

(kg)

R1 R2 R3 R4 R5 R6

241

MO 1545 2095 100 349 271 119 368 290 1497

MS 1545 2095 133 384 290 121 372 278 1578

MA/MC0 1545 2095 170 433 323 121 384 274 1705

321

MO 1545 2095 105 369 286 126 389 306 1581

MS 1545 2095 140 405 306 127 392 293 1662

MA/MC0 1545 2095 178 454 339 127 403 288 1789

361

MO 1545 2095 114 400 311 137 422 333 1717

MS 1545 2095 152 438 331 137 424 317 1798

MA/MC0 1545 2095 192 489 365 136 433 310 1925

242

MO 1845 2095 69 412 378 70 413 380 1723

MS 1845 2095 102 450 404 66 414 368 1805

MA/MC0 1845 2095 137 498 438 63 424 364 1925

322

MO 1845 2095 72 432 397 74 433 398 1806

MS 1845 2095 107 471 423 69 434 385 1888

MA/MC0 1845 2095 143 520 457 66 443 380 2008

362

MO 1845 2095 78 464 427 79 466 428 1942

MS 1845 2095 114 505 453 74 465 413 2024

MA/MC0 1845 2095 153 555 488 70 473 406 2144

420

M0 2290 2095 250 536 306 309 595 365 2360

MS 2290 2095 298 582 328 312 596 342 2458

MA/MC0 2290 2095 409 689 373 337 616 300 2724

485

M0 2290 2095 254 545 311 314 605 371 2402

MS 2290 2095 304 592 334 317 606 347 2500

MA/MC0 2290 2095 415 699 378 342 626 305 2766

540

M0 2290 2095 260 558 318 322 620 380 2459

MS 2290 2095 310 605 341 325 620 355 2557

MA/MC0 2290 2095 424 714 386 349 639 311 2823

600

M0 2290 2095 266 570 325 329 633 388 2512

MS 2290 2095 317 618 348 331 633 363 2610

MA/MC0 2290 2095 432 727 394 355 651 317 2876

M12

Minimum free space for commissioning and maintenance operations

1500 mm

Packaged rooftop units

with integrated gas burner

CO2 CONTROL

OFFSET

CONTROL

CALIBRATED

VENTURI

GASINLET

TOTHEBURNER

PRESSURE COCK

GAS INLET

models 150/200

CALIBRATED

VENTURI

CO2 CONTROL

PRESSURE COCK

GAS INLET

OFFSET

CONTROL

GASINLET

TOTHEBURNER

models 032/092

7. GAS BURNER

Flue

Air

Gas

EVP

EV2 EV1

Condensation

drain

for mod.150/200 only

Operating principle

Connection / disconnection of the burner

Whenheatingis required(A),theburner remotecontrolstartstheworking

cycle of the modulation board which activates the ﬂame control device.

This device starts up the burner combustion air fan (A), thus starting an

air current in the combustion chamber for a preset period of time.

When this phase has been completed the ignition cycle begins: the

electromagneticvalve EV1opensat thesametime astheEVPvalve (B),

supplying the pilot burner. When the device detects the pilot ﬂame it will

open the main gas valve EV2 (C) to supply the main burner.

The pilot and main burner will work together for a short period of time.

After this, the modulation board will close the electromagnetic valve

EVP (D) and disconnect the pilot burner.

The one electrode only guarantees the detection of the ﬂame for the

pilot and main burner.

pilot burner

Burner group

EVP

EV1

EV2

detection

electrode

start-up

electrode

nozzle

Control device

On/off signal

Burner fan

EVP - pilot light flame

EV1 - 1st electromagnetic valve gas

EV2 - 2nd electromagnetic valve gas

ABC D E F Operation of the air-gas premix

The air and the gas mix inside the vanes of the motor fan assembly.

The air inlet is achieved via a calibrated Venturi pipe from which the

gas is taken in.

The air/gas pressure ratio is 1:1 and can be adjusted by turning the

offset screw in the gas valve. The burner is supplied with the offset set

and the screw sealed.

The burner can also be regulated by adjusting the screw located above

the Venturi which establishes the maximum air ﬂow rate value and, as

such, determines the carbon dioxide content in the condensates. This

screw is factory-set and must not be touched, although it is not sealed

thus allowing a changeover to another type of gas (before doing so this

must be consulted).

The modulation board installed in the burner regulates the fan speed (in

direct current) in accordance with the requirements of thermal capacity.

The gas ﬂow rate changes at the same time as the variation in the motor

speed. The minimum and maximum values for the motor speed are

stipulated on the plate and cannot be changed.

The ignition cycle connects the burner to half capacity (approx. 70% of

its maximum thermal capacity). Two minutes after starting the burner

reduces its capacity to the minimum and as from this moment starts to

have modulating control (0-10Vdc) in accordance with the installation

requirements.

Packaged rooftop units

with integrated gas burner

Control of the gas burner

Toestablish theelectric powersupply ofthe unit(wire intake,

conductor section and their calculations, protections, etc.),

refer to the information provided in the technical catalogue

for the 48EN/EH units, the wiring diagram included with

the unit as well as the regulations and standards in force

that regulate the installation of air conditioning units and

electrical receivers.

Important:All the connections to be established by the client

are featured on the wiring diagram included with the unit.

CARRIERrtc control

The CARRIERrtc control has a proportional output 0/10V (Y2) where

a natural gas or propane gas proportional actuator can be connected.

The control will manage its connection, in HEATING mode, through an

ON/OFF signal in digital output NO5.

- In cooling-only devices, the control will activate the burner the same

way as an electrical heater with one or two stages.

- In heat pump units it is possible to select three different methods for

controlling the burner for display:

• Operation of the compressors as one or two electrical heater

stages (both optional not compatible).

• Operation instead of the compressors.

• Operation instead of the compressors if the outdoor temperature

is less than the value set (5ºC by default).

When the return temperature drops below the value set for the burner

connection the burner will start to operate. The control of the power

will be carried out in accordance with the air outlet temperature and

the return temperature. The control will therefore compare both

temperaturesand although thereis ahigh burner powerdemand, ifthe

outlet temperature is excessively high it will limit the power supplied

by the burner. This avoids the stratiﬁcation of the hot air masses and

that the outlet air temperature exceeds a maximum safety level, 55ºC

by default, which will cause the burner to stop.

Moreover,units with gasburner always includea ambient temperature

probe to limit the difference between the air outlet pressure and the

ambient temperature and, with that, improve the feeling of thermal

comfort.

The gas burner integrates operations control and its safety devices.

The control CARRIERrtc will receive a safety signal from the burner in

the event of failure (digital input DI5), which will only serve to indicate

the failure.

Position of the outdoor

thermostat (located below

the 48EN/EH electric panel)

Wiring diagram:

The hose with all the wires required for the connection of the burner

control with the CARRIERrtc control must be wired in a box located

inside the 48EN/EH box.

230 Vac

RUN Signal

987654321 12111098 GNDLN

Burner remote control

On/Off

0/10Vcc

AL (DI5) Signal

N.O. N.C.010

(Y2)

ON/OFF (NO5) Signal

Burner remote

control

Instantaneous voltage

display screen

Burner in operation

Unit switched on

On the burner

remote control

screen the

instantaneous

voltage transmitted

to the control plate

is displayed.

Theburner remote control is alsoresponsible formanaging thesafety

devices. In the event of failure the CARRIERrtc control will be sent a

failure signal by way of indication.

In addition to the burner’s safety devices, the CARRIERrtc control

allows incorporating complementary safety elements in the unit for the

detection of smoke, excessively high temperatures, loss in the air ﬂow

rate etc. (consult the section on “Safety Devices”).

The connection of this hose is explained in the chapter “Burner

Installation”.

Access door

Main electric panel

(CARRIERrtc control)

Auxiliary electric panel

(burner remote control)

Access door

This manual suits for next models

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