21
Configurable Parameters
Rover, Trane’s service tool, uses the
unit type “heat pump” to determine
and download unit configuration
information, such as the default
analog inputs, the default binary
inputs, and the default binary output
configurations. See Table 7 for
default configurations for heat
pumps.
Table 8
: Heat pump heating or cooling operation.
Unit Type
Heat pump
Cooling Source
Compressor
Heating Source
Compressor (none for cooling only units)
Compressors
1 (2 for 2-compressor units)
Binary Outputs
BOP 1: Fan on (normally open)
BOP 2: Reversing valve (normally open)*
BOP 3: Not used
BOP 4: Compressor 1 (normally open)
BOP 5: Compressor 2 (normally open)**
BOP 6: Outdoor Air Damper (normally open)***
Binary Inputs
BI 1: Low temperature detection, circuit 2 (normally closed)*
**
BI 2:
Condensate overflow
(normally closed)†
BI 3: Occupancy (normally open)
Analog Inputs
Zone: Space temperature (0.0 F calibration)
Set: Setpoint (0.0 F calibration)
Fan: Fan mode
AI 1: Leaving water temperature
AI 2: Discharge air temperature
Fan
Fan operation (heating): Cycling
Fan operation (cooling): Cycling
Fan speed default (heating): On/high
Fan speed default (cooling): On/high
Fan switch (hardwired): Enabled
Setpoints
Unoccupied cooling setpoint: 85 F
Occupied standby cooling: 78 F
Occupied cooling setpoint: 74 F
Occupied heating setpoint: 71 F
Occupied standby heating: 67 F
Unoccupied heating setpoint: 60 F
Cooling setpoint high limit: 115 F
Cooling setpoint low limit: 40 F
Heating setpoint high limit: 115 F
Heating setpoint low limit: 40 F
Thumbwheel set point: Enabled
Occupied Bypass
Timer
120 minutes
Leaving Water
Temperature
Low Limit
Unit specific (20 F ground source or 35 F standard)
Location Identifier
Unit specific (maximum of 30 characters)
Configuration
The heating and cooling setpoint
high and low limits only apply to the
occupied and occupied standby
setpoints. These limits never apply
to the unoccupied setpoints.
The leaving water temperature low
limit is used for freeze protection of
circuit 1 on heat pumps. Circuit 2 is
protected by a binary low
temperature detection device
(freezestat) with a fixed trip point.
* BOP 2, BI1: Not used on cooling only units.
** BOP 5: Not used on signal compressor unit.
*** Configured but not required.
† Optional model number dependent
The occupied bypass time is used for timed
override applications. The timed override
timer is maintained in the unit controller.
When the timed override is applicable, the
controller reports “Occupied Bypass” as its
effective occupancy mode.
