Trane SSC-APG002-EN User guide

Application Guide

SSC-APG002-EN

For Trane XR Style Split Condensing Units and Heat Pumps

Low OD Ambient Operation

Unit Mounting

Minimum Clearances

Purpose:

The purpose of this bulletin is to provide cumulative application criteria as related to the Trane XR

style cooling units and heat pumps.

This bulletin discusses:

I. Definitions and terms

II. Off Season Cooling Operation

III. Unit Mounting

IV. Minimum Operating Clearances

ISSUED BY:

Product Application Engineering Department

Trane

Tyler, Texas

Pg 2

POSITION STATEMENT:

The Trane Company has always recommended installing Trane approved, matched indoor

and outdoor systems. All Trane split systems with a nominal rating of 13 SEER and above

are listed in the ARI Certified Directory with thermostatic expansion valves (TXV) only.

Pg. 3

All 2.5 to 5 ton three phase split system cooling units and heat pumps are shipped from

the factory with compressor crankcase heat. Three phase compressor do not require

start capacitors or start relays.

CCHT - Compressor Crankcase Heater, sometimes called a compressor sump heater.

This device is designed to warm the compressor crankcase (or sump) in order to prevent

or deter refrigerant migration during the compressor off cycle. Compressor crankcase

heaters are required for low ambient cooling operation.

TXV - Thermostatic Expansion Valve. This is a type of refrigerant flow control device

designed to maintain constant superheat throughout the operating envelope. For low

ambient cooling applications, a non-bleed TXV is required.

Bleed TXV: This type of TXV will allow the refrigerant pressures between the high side

and low side to equalize through the valve during the off cycle.

Non Bleed TXV: This type of TXV will not allow the refrigerant pressures between the

high side and low side to equalize through the valve during the off cycle. When using this

type of valve on single phase units with reciprocating style compressors, compressor

start components are required. Check product data specifications for most current infor-

mation.

Head pressure controller - A device that is field installed on a condensing unit or heat

pump designed to maintain system head pressure that will allow safe system operation

without indoor coil icing in colder outdoor ambients. The BAYLOAM103 will cycle the

condenser fan motor in order to achieve adequate operating head pressure. The control

is adjustable.

Evaporator Defrost Control - A device that is field installed on the system’s indoor coil

in order to prevent the system from running during the cooling cycle when the indoor coil

approaches or reaches a temperature in which frost will form on the coil surface. When

the indoor coil approaches a safe temperature for cooling operation, the control will close

and allow the outdoor unit to restart. This controller makes and breaks the control volt-

age to the condensing unit.

Quick Start Component - This component may be factory installed or offered as a field

installed accessory ( BAYKSKT***). A quick start kit consist of a capacitor with a high

microfarad rating and a potential relay. It is installed so that the start capacitor is wired in

parallel with the compressor’s run capacitor. Prior to start-up the potential relay contacts

are closed, therefore placing the start capacitor in the compressor circuit, as the com-

pressor motor reaches operating speed, electrical current flows through the potential

relay’s coil and the the relay contacts are opened, thus taking the start capacitor out of

the system until the next compressor start up.

Unit Base Size - Unit base size may be determined by looking at the cabinet size. This is

located on the unit dimension page in product data or the installation manual. Dimensions

are also noted in this document. However, for the most up to date information, the Instal-

lation manual and / or product data should be referenced.

Definitions and information:

Three phase products:

Section I - Off Season Cooling Operation:

The Trane XR models may be operated in the cooling mode to 45oF as shipped from the factory when

applied with an indoor TXV. Where required, these units, with appropriate accessories, may be

applied to operate at outdoor temperatures below 450F.

Please refer to the accessory table below when determining if the desired model unit will operate at the

specified conditions and required accessories

AY28X079: Cooling only

AY28X084: Heat pumps

Head Pressure Controller:

BAYLOAM103: Approved for heat pumps and cooling units

Evaporator Defrost Control Kits:

Compressor Crankcase Heaters:

Reciprocating Compressor: BAYCCHT300

Scroll Compressor: BAYCCHT301

Pg. 4

As noted in the above table, the XR13 outdoor units may be operated to 0oF if necessary, by applying

the BAYLOAM103 head pressure controller and other required accessories. The BAYLOAM103 is a

newly developed head pressure controller that cycles the OD fan as needed to maintain liquid line

temperature as set by the DIP switches located on the control. There is no need to change the outdoor

fan motor on approved products since the controller does not vary the frequency to the motor. For

more information publication number 18-HE46D1-1or latest version, should be consulted.

* Unit requires a compressor crankcase heater and start accessory only if it is not factory installed.

Check general specifications located in product data to determine if unit is equipped with factory

installed quick start components.

* *Solenoid valve required if:

1. Liquid line is one size larger than factory connection. (example: factory connection is 3/8” and the

existing liquid line is 1/2”) Please refer to publication 32-3009-03 or latest edition for approved line sizes.

2. Off cycle time will be longer than 30 minutes during low ambient cooling operation.

More Information:

Wind Shields:

Please refer to page 14 of this document for information regarding wind shields when low ambient cooling

operation is required.

Ambient Temperature in Cooling Mode Operation

Model

Family 45 F 30 F 0 F

2TTR3 As Shipped AY28X079 CCHT* BAYLOAM103 AY28X079 Quick Start

Accessory CCHT* Solenoid

Valve**

2TWR3 As Shipped AY28X084 CCHT* BAYLOAM103 AY28X084 Quick Start

Accessory CCHT*

4TTR3 As Shipped AY28X079 CCHT* BAYLOAM103 AY28X079 Quick Start

Accessory CCHT* Solenoid

Valve**

4TWR3 As Shipped AY28X084 CCHT* BAYLOAM103 AY28X084 Quick Start

Accessory CCHT*

2TTR4 As Shipped AY28X079 CCHT* Not Approved

2TWR4 As Shipped AY28X084 CCHT* Not Approved

4TTR4 As Shipped AY28X079 CCHT* Not Approved

4TWR4 As Shipped AY28X084 CCHT* Not Approved

Typical wiring when using the evaporator defrost control (EDC):

Cooling Split System and AY28X079 Evaporator Defrost Control

Red (R)

Y Low

Orange

Green (G)

White (W1)

White (W2)

White (W3)

Blue (B)

Red

Yellow

Orange

Brown / X2

Blue

EDR-1

EDC

EDR

Red (R)

Y Low

Green (G)

White (W1)

White (W2)

White (W3)

Blue (B)

EDC

Heat Pump Split System and AY28X084 Evaporator Defrost Control

Thermostat

Air handling unit

Thermostat

Pg. 5

Heat pump

unit

Air handling unit

Cooling

unit

SECTION II - Unit Mounting:

This section describes appropriate methods for mounting and securing the XR13 and XR14 style split

system cooling and heat pump units. However, if these units are to be mounted in a region where high

winds are an issue, please refer to the Trane BAYECMT001 extreme conditions mounting kit. In

seizmic zones the unit shall be secured according to local code; this may require a local P.E.’s stamp.

When mounting or securing Trane residential style condensing units and heat pumps please observe the

following.

1. Anytime the unit is to be supported from the edge, the supporting material must extend minimum two

inches beyond the perimeter of the unit’s base.

2. The mounting hole locations are molded in the basepan, however, must be drilled through.

a) Hole locations are identified on page 7 and 8 of this document as well as the unit installation guide.

3. Washers should be placed in between the fastener head and the basepan.

4. Trane recommends supporting the center of the unit with a cross member if unit is not mounted on

plate.

5. Base 2, 3, and 4 pans have four mounting hole locations.

6. Drill size / bolt diameter shall be 5/16”.

Drawings for illustration purposes only.

Pg. 6

If supporting the base pan from the perimeter, the support must extend under the base pan at least 2”. Trane recommends

supporting the middle of the base pan with a cross member.

support must extend 2” from the basepan perimeter

support center of unit

Pg 7

BASE PAN MOUNTING HOLE LOCATIONS

( location only, holes must be drilled )

BASE PAN MOUNTING HOLE LOCATIONS

( location only, holes must be drilled )

support must extend 2” from the basepan perimeter

support center of unit

support must extend 2” from the basepan perimeter

support center of unit

If supporting the base pan from the perimeter, the support must extend under the base pan at least 2”. Trane recommends

supporting the middle of the base pan with a cross member.

Pg 8

Section III - Minimum Operating Clearances

This section discusses installating the XR style condensing unit / heat pump where spacing is limited.

When installing Trane outdoor units in a location where clearance to other units, walls, fences, etc. is

limited, the concerns listed below must be addressed:

1. System Operation - Adequate airflow must be provided to and away from the condensing unit / heat

pump in order to enable appropriate heat transfer. If this is accomplished, head pressure will remain

within an effective operating range.

2. System Servicability - Sufficient working space must be allowed for the HVAC service technician to

properly maintain the condensing unit / heat pump. Furthermore, space must be allowed for major

component change out in the event of a failure. Working space is determined by the Local, State and

National Codes. (See National Electric Code Table 110.26 for explanation.)

3. Space Maintenance - Appropriate area must be allowed in order to maintain the ground area where

the units are positioned to prohibit debris from collecting on the panels, thus further providing

unobstructed airflow to the condensing unit.

3. State, Local Codes, and National Codes shall prevail. Check with the local jurisdiction before

installation to assure compliance.

Numerous projects require minimum clearances between outdoor units and adjacent walls, fences and other

units. The obstruction in question is usually one of the following:

1. One or more walls of an adjacent building.

2. Fences or barriers provided to reduce sound transmission or visually screen the equipment.

3. Other outdoor units in a multi-unit installation.

4. Acombination of the above.

5. Overhangs

The prime considerations involved in establishing minimum clearances are:

1.Adequate airflow to the outdoor coil with minimum recirculation.

2. Service access to the equipment.

3. Compliance with the National Electric Code and other applicable codes.

4. Design temperature - Design temperatures greater than 105F require additional consideration.

I. In order to assure that adequate airflow reaches the condensing unit, size free air passages at 300

Feet Per Minute maximum velocity. See condensing unit airflow performance on page 23 of this

document.

II. The importance of providing proper service access to equipment cannot be overemphasized. The HVAC

service technician’s job may be performed with greater ease and lower cost if adequate service space is

allowed.

III. Knowledge of the National Electric Code and other applicable codes for the job sight location is a

necessity in order to satisfy local inspectors. These codes are in place for service as well as safety.

IV. Be sure to read all provisions and footnotes contained in this document. When ambient temperatures

exceed 105F, more space may be required for minimum operating clearances.

Pg. 9

1. Installation of a single condensing unit / heat pump in a corner with free air space on top.

A) For locations where the design ambient temperature is below 105F:

1) 1.0 feet clearance on 2 sides - If shrubbery is to be placed by the unit other side, then allow 1.0

Feet minimum clearance from the unit

2) Service access side requires 3 feet minimum clearance. Consult Local, State, and National

Electric Codes for minimum service clearance.

B) For locations where the design ambient temperature exceeds 105F:

1) 1.5 feet clearance on 2 walls. - If shrubbery is to be placed by the unit other side, then allow 1.0

Feet minimum clearance from the unit.

2) Service access side requires 3 feet minimum clearance.

C) If unit is located in such a way that service panel is facing the wall

1) NEC requires 3 feet minimum clearance between the unit and the wall

a) This space may be increased to 3 1/2 feet. Consult the National Electric Code for more

information regarding minimum clearances for working spaces.

2. Installation of two or more units where two adjacent walls form a corner.

A) For locations where the design ambient temperature is below 105F:

1) Note the unit base size and obtain the minimum clearance values from the table below.

B) For locations where the design ambient temperature exceeds 105F:

1) 2.0 feet clearance from both walls.

2) 3.0 feet clearance in between units, unless service panels face each other. (if service panels

face each other, this clearance may be increased to 4 feet per NEC)

C) If unit’s are located in such a way that the service panels are facing the wall

1) NEC requires minimum 3 feet between the unit and the wall

a) This space may be increased to 3 1/2 feet. Consult the most current edition of the National

Electric Code for more information regarding minimum clearances for working spaces.

SERVICE ACCESS PANEL SIDE 3’minimum clearance

Service Panel

-1.0’-

min

-1.0’-

min

A2B 2B

Pg. 10

-1.0’-

min

3.0’ min 5 feet minimum unrestricted top

clearance shall be provided.

5 feet minimum unrestricted top

clearance shall be provided.

eziSesaBAB

ecivreS

ecnaraelC

2'0.1'0.1"63

3'2.1'2.1"63

4'5.1'4.1"63

minimum clearance table

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