Section I - Off Season Cooling Operation:
The Trane XR models may be operated in the cooling mode to 45
o
F 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 45
0
F.
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 0
o
F 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
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