York MKC 12S Quick start guide

Cassette

MINISPLIT

MKC / MKH 12-18-24

Infrared remote

control

MOC / MOH

YORK

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List of Contents

Page

1 - Safety...................................................................................................................................................................................3

2 - Indoor and outdoor onits......................................................................................................................................3

2.1 - Indoor unit...........................................................................................................................................................3

2.2 - Panel with return grille for indoor unit..........................................................................................3

2.3 - Outdoor unit.......................................................................................................................................................3

2.4 - Auto restart and anti freeze protection.......................................................................................3

3 - Technical specifications........................................................................................................................................3

4 - Dimensions.....................................................................................................................................................................4

5 - Installation........................................................................................................................................................................5

6 - Condensate drainage.............................................................................................................................................6

7 - Refrigerant piping connections.......................................................................................................................7

8 - Wiring diagram.............................................................................................................................................................8

9 - Front panel installation..........................................................................................................................................8

10 - Maintenance...............................................................................................................................................................10

11 - Technical appendix................................................................................................................................................10

Parts List: (Contact York)

Decommissioning, Dismantling and Disposal

1 - Safety

Installation and maintenance of this air conditioning system

should only be carried out by trained and qualified personnel.

Regular maintenance operations such as cleaning the coils and

air filters must be performed to keep the units in proper

operating condition.

CAUTION

Before undertaking any work on the unit, make sure that the

power supply has been disconnected.

ELECTRICAL CONNECTIONS

All electrical wiring and connections must comply with local

standards.

GENERAL PRECAUTIONS

Check that the power supply available agrees with nameplate

voltage.

Use adequate line protection.

The unit must be grounded.

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2 - Indoor & outdoor units

3 - Technical specifications

2.1 - Indoor unit

Each unit is shipped with the following items:

-an indoor unit ready for connection to the condensing unit,

-mounting brackets,

-a technical tuide,

-a user's tuide,

-an infrared remote control with a wall bracket and 2 batteries,

-a cut-out template for the casing printed on the cassette

packing box.

2.2 - Panel with return grille for indoor unit.

2.3 - Outdoor unit

The units are shipped complete with a charge of R22 refrigerant

sufficient for a piping length of 7.5 metres.

2.4 - Auto restart and anti freeze protection

-After a power failure, the unit restarts automatically (when

power is resumed) in the same mode.

-When evaporator surface temperature is –2°C, the compressor

is stopped, the fan continues to run. Compressor operation is

resumed when temperature rises to 0°C.

Indoor MKC - MKH

Models unit 12S 18S 24S

Outdoor MOC - MOH

unit 12 18 25

Cooling Btu/h 12 000 18 000 24 000

kW 3.5 5.3 7

Capacities Heating Btu/h 12 500 18 500 25 100

kW 3.6 5.4 7.1

Electric heating kW 2 2 2

(option)

Compressor Type Rotary Reciprocating

Refrigerant R-22

Power supply V/Ph/Hz 220/240-1-50

Power input kW 1.3 2 2.8

Nominal current A 6.3 9.4 13

Current draw (Electric heat) A 9.1 9.1 9.1

Indoor air flow m3/h 640 850 950

Noise level at 3m

Indoor

dBA 18/24/27 26/30/33 32/36/38

Outdoor

37 55 56

Operating controls Wireless remote control

H (mm) 300/492 300/590 300/696

Dimensions Indoor/Outdoor W (mm) 575/764 575/820 575/850

D (mm) 575/230 575/280 575/287

Net weight Indoor kg 20 22 24

Outdoor 38 59 65

Type of connection Flared

Piping Diameter Gas 1/2" 5/8" 5/8"

Liquid 1/4" 3/8" 3/8"

Dehumidification l/h 1.7 2.5 3.2

Nominal cooling capacity based on : Nominal heating capacity based on :

- Indoor air temp. 27°C DB/19°C WB - Indoor air temp. 21°C DB - Outdoor air temp. 7°C DB/6°C WB

- Outdoor air temp. 35°C DB Piping length : 7.5 m

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4 - Dimensions

MOC - MOH

12-18 25

A200 200

B400 400

C100 100

D200 250

E600 600

Unit Clearances

Aminimum of clearance is necessary around the units to ensu-

re proper air circulation and easy access for maintenance.

Unit dimensions are shown in the technical characteristics

table on page 3.

Outdoor unit: MOC/MOH 12-18 Outdoor unit: MOC/MOH 25

Clearances required for outdoor units

B EA D

660 575

660

1. False ceiling

2. Condensate drainage

3. Gas line connection

4. Liquid line connection

5. Removable electrical box

6. Holes ø 2,9 mm

7. Pre-stamped knock-out for remote air discharge

8. Pre-stamped knock-out for outdoor air intake

Note:An outdoor air grille and an air filter must be used with the

outdoor air intake.

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5 - Installation

• Outdoor unit installation

•Location of the indoor unit

The unit should be installed in such a way that airflow around the

room is not hindered in any way. If possible, install the cassette

unit in the centre of the room (leave at least one meter of clea-

rance on all sides of the unit).

Air diffusion will be less efficient if the ceiling is at a height grea-

ter than 3 metres.

The cassette unit is fixed in place with two brackets and four

threaded rods (see diagram below).

ø8

630

The two brackets must be installed perfectly level.

When the cassette is in place on its supports, connect the refri- geration lines, the electrical power supply and the condensate

drainage line.

False ceiling

Infrared receiver board located behind the air

return grill.

View :

LED : OPE : Unit startup.

POWER : Unit power-up.

TIMER : Timer mode.

Emergency operation : Enables the unit to

be used without the remote control.In this

case, set the selector to "COOL" or "HEAT"

(MKH only) depending on the operating mode

required. The "OPE" LED flashes continuous-

ly when the unit is operated this way, and the

remote control is forced off-line. The tempera-

ture setpoint is set at 24°C both in the heating

and cooling mode. To revert to normal remote

control operation, set the selector to the

"NOR" position.

Connectors COOL NOR HEAT

OPE

POWER

TIMER

• Connections

Suction line

Liquid line

Electrical connections between sections

Electric heat supply (option)

Condensate water evacutation

Indoor unit

Outdoor unit

Remote control

Main electrical power supply

Optional electric heating coil AKR01A (2kW) :

MKC (cooling only) : The heating element, instal-

led around the coil like a belt, is activated by a

relay located on the control board. Installation of

this option requires no particular modification of

the equipment.

MKH (heat pump) :The heating element is acti -

vated by a relay located on the control board.

Installation requires a separate power supply

with 3 x 1,5 mm2conductors for the 2 kW heating

element.

In this instance, the heating element serves as a

backup heating source (1str stage :

COMPRESSOR

2nd stage :

ELECTRIC HEATER

) and is regulated

according to the temperature difference between

the setpoint and the return air temperature.

The heater element is supplied with an automa-

tic reset control thermostat and a manually reset

high temperature safety device.

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Condensate drainage

Condensates collected in the drain pan are piped to a tank fitted

with :

- a drainage pump, with a pumping height of 0.6 m measured

from the base of the cassette unit (see diagram opposite),

-a safety float switch that stops the entire unit in the event of a

problem with condensate drainage (pump failure, obstructed

drainage piping...).

The condensate drainage line must be insulated to prevent dro-

plets of condensation from dripping on the false ceiling.

Connect the drainage tube (ø int. 12 mm) coming from the pump

to a "P.V.C." drainage line (ø 32 mm mini). It is advisable to install

a U bend in the drainage line.Make sure that all piping joints are

leak tested.

Drainage piping should be installed with a 1% downward slope

(1cm per metre) without any rises.

6 - Condensate drainage

Verification of condensate water drainage:

Fill the drain pan and observe evacuation.

Fill the drain pan manually with water to check correct

evacuation.

Gradient > 1%

Max.0.6m

Max. 0.6 m

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7 - Refrigerant piping connections

Make piping runs as short as possible and avoid all

unnecessary changes in direction or elevation.

To prevent heat loss, the two lines must be insulated

separately.

Use an appropriate bending tool to form curves and avoid

flattening the refrigerant tubes.

Fix piping with pipe clamps and make sure that any eventual

pipe vibrations cannot be transmitted to the building structure.

Use refrigeration quality piping only with an operating pres-

sure rating of at least 30 bars. Never use ordinary «plum-

bing» quality piping : you MUST use special de-oxidised,

dehydrated, refrigerant quality copper piping.

Pipe lengths

• Maximum piping lengths

Note: Where the difference in elevation between the indoor

unit and the outdoor unit is greater than 5 metres, install

an oil trap every 5 metres.

The suction line must have a 2% gradient up to the compressor

on horizontal sections.

Where piping lengths are unusually long and include a large

number of oil traps, it may be necessary to adjust the compres-

sor oil charge.

•Refrigerant charge to be added per extra metre of

piping length when more than 7.5 m.

Refrigerant piping connections (FLARE connections)

To avoid alteration of unit capacities, make sure that piping

lengths and changes in elevation are kept to a strict minimum.

Before connecting the refrigerant lines, follow the procedures

below (if pre-charged connection lines are not supplied) :

-Select copper pipe diameters according to the size of unit to

be installed.

-Install the refrigeration lines, making sure that no foreign

bodies get inside the piping.

-Install the flare connectors and flare the ends of the pipes.

-Evacuate the piping. This operation, which should last at

least 15 minutes or even longer if there are large piping

lengths and changes in elevation, should be followed by a

leak test. To this effect, when the piping has been evacua-

ted, close the pressure guage tap, note the value on the

guage, then wait for 15 minutes. If the needle moves, there

is a leak in the system. Make the necessary adjustments or

repairs and repeat this procedure until the needle no longer

moves.

-Open the service valves and top up the refrigerant charge if

necessary.

Minimum thickness 6 mm

Insulation

Heat pump

(discharge)

Gas

Cooling

(suction)

Liquid

Cooling

Heat pump

(discharge)

Gas

Cooling

(suction)

Liquid

Cooling

Gas line

Liquid line

R22

Indoor unitOutdoor unit

Unit size

12 18 25

D (m) 15 15 22

L (m) 18 18 25

H (m) 12 12 20

Unit size 12 18 25

g/m 15 40 40

High pressure

Manifold

Gas valve

Liquid valve

Pressure

tap

Low pressure

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For details of indoor and outdoor unit wiring, see the diagram

supplied inside the units. Start the unit and check operation both

in cooling and heating mode.

Installing the "diffuser-grille" assembly

• Mounting

-Remove the return air grill by springing the 4 mounting clips

and 2 hinges (fig. 1, ref. a).

-Remove the air filter (fig. 2 & 3).

-Put the grill in place under the cassette chassis (fig. 4).

-Connect the panel heater wires.

-Fit the casing and grille together using the screws (fig. 5, ref. b).

- Put the filter (fig. 6) and the return air grille (fig. 6 & 7) back in

place.

8 - Wiring diagram

9 - Front panel installation

1NE 2

1NE A 2

Power supply

220V/1Ph/50Hz

Cooling only units - MKC

1NE 2

1NE A 2

Power supply

220V/1Ph/50Hz

Heat pump units - MKH

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Fig. 5

Fig. 4

Fig. 3

Fig. 2

Fig. 1

Wiring sizes

Unit size 12 18 25

Power supply mm23 x 2.5 3 x 4

Interconnection Cool. mm23 x 2.5 + ground 3 x 1.5 + ground

(Indoor/Outdoor) Heat. mm24 x 2.5 + ground 4 x 1.5 + ground

Fuse (Slow-blow) A 10 16 20

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Directing the airflow

With direct air discharge, pay particular attention to the direction

in which the air is discharged.

•Air deflectors (ref a)

These deflectors should be directed so that a maximum volume is

given to the envelope of the airstream. Below, the diagram shows

the optimum position required to acheive the best possible airflow

performance.

• Integral diffuser

In the cooling mode, cool air is discharged horizontally just below

the ceiling, ensuring even air distribution in the room due to the

«coanda» effect without causing drafts.

In the heating mode, airflow can be directed so as to prevent stag-

nation at certain places in the room (stratification of hot air).

9 - Front panel installation (cont’d)

Fig. 7Fig. 6

Cooling operation (summer)

Coanda effect

Heating operation (winter)

Detail A

Depending on the configuration of the room to be air conditioned,one or two of the deflectors may be left closed.

Summer position

Winter position

YES YES NO

Depending on the layout of the conditioned space, 1 or 2 dampers may be closed. This is necessary for air discharge through a

discharge satellite into an adjacent room or when the cassette unit is installed too close to a wall.

Operation in heating mode only : Although the unit has an anti-stratification

function, it may be necessary to offset the return air sensor setpoint, in cases

where ceilings are particularly high for example. This can be done with the two

microswitches on the control board. Setpoint offsetting is only effective in the

heating mode and has no effect on the cooling mode.

Temp. Switch

difference °C 2 1

0 OFF OFF

1 OFF ON

3 ON OFF

5 ON ON

1 2

OFF

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11 - Technical appendix

10 - Maintenance

The units are designed to operate for long periods of time with a minimum of maintenance. However, the following operations must be

performed regularly.

Component Maintenance operation Recommended frequency

Air filter 1 - Clean with a vacuum cleaner or tap gently then Every month or more

wash in warm water (40°C) with a mild detergent. often if necessary.

2 - Rinse and dry before replacing on unit.

3 - Never use petrol, alcohol or any other chemical

product.

Unit casing 1 - Remove dust from the front panel with a soft duster Every month or more

or wipe a damp cloth with a mild soap solution. often if necessary.

2 - Never use petrol, alcohol or any other chemical

product.

Drain pan and 1 - Clean and check for obstructions. Each season before start up.

evacuation piping

Indoor / outdoor coils 1 - Check condition and remove dust from between Each season before start up.

coil fins.

Compressor 1 - No maintenance required.

ALL OTHER SERVICE AND MAINTENANCE OPERATIONS MUST BE PERFORMED BY TRAINED

AND QUALIFIED PERSONNEL APPROVED BY THE SUPPLIER

Unit Capacity

Total cooling capacity can be determined by using correction fac-

tors C1, C2 and C3.

Given cooling capacity = Cooling capacity at standard rating

conditions x C1 x C2 x C3.

C1 = Capacity correction factor for temperature

C2 = Capacity correction for piping length

C3 = Capacity correction for indoor unit fan speed

Capacity correction factor for temperature (C1)

*Conditions applicable for the "Low ambient line" / +19°C for the "Export

line".

Correction factors (C1) determine the instantaneous capacity (which

does not take account of defrosting on heat pump units). These

capacities may vary slightly, depending on the size of the unit.

Cooling capacity correction factor

Indoor temp. Outdoor temp. °C DB

°C WB 19 25 30 35 40 46

23 - 1.20 1.15 1.11 1.06 1

19 1.10 1.08 1.04 1 0.96 0.90

14 0.88 0.86 0.84 0.82 0.79 0.74

Heating capacity correction factor

Indoor temp. Outdoor temp. °C WB

°C DB 14 10 6 0 -8

23 1.20 1.04 0.96 0.77 0.58

20 1.25 1.10 1 0.80 0.69

17 1.30 1.13 1.04 0.83 0.63

Maximum Minimum

Cooling mode +46°C 0°C

(-10 with fan stoppage)

Heating mode +28°C -10°C

(heat pump mode)

Unité intérieure

Fan speed High Medium Low

Correction factor C3 1 0.90 0.75

Capacity correction factor for indoor fan speed (C3)

Capacity correction factor for piping length (C2)

Operating temperature limits

Indoor unit

Piping length (m) 7.5 10

Correction factor C2 1 0.98

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