Phase Unbalance Limit Enable; Soft Load Current Limit Rate Of Change; Momentary Power Loss Protection Enable; Lwt Control Proportional Gain - Trane RTHC Installation Operation & Maintenance

Phase Unbalance Limit Enable

The UCM provides non-defeatable phase unbalance
protection that stops compressor operation with more
than 30% phase unbalance. If this unbalance limit is
enabled, the motor will be "limited" from running at
full load as a function of % unbalance. This feature
prevents excessive overheating that otherwise would
result. If the limit is disabled, then no current limit is
imposed due to phase unbalance.
Phase Unbalance Limit:
Press (+)(-) to Change Setting
where enabled is the ROM default.

Momentary Power Loss Protection Enable

Momentary Power Loss Protection:
Press (+)(-) to Change Setting
where enabled is the ROM default.
Soft Load Control Enable
Soft Load Control:
Press (+)(-) to Change Setting
where disabled is the ROM default
Soft Load Starting Current Limit
Soft Load Starting Current Limit:
Press (+)(-) to Change Setting
The range of values is 40 to 100% in increments of
1%. The ROM default is 100%.
Installation, Operation and Maintenance

Soft Load Current Limit Rate Of Change

Soft Load Current Limit Rate:
The range of values is 0.5 to 5%/Min in increments of
1 or 0.1%/Min depending on the service setup
screen. The ROM default is 5%/Min.
[d/e]
Soft Load Lvng Wtr Temp Rate of Change
Soft Load Lvg Water Rate:
The range of values is 0.5 to 5°F/Min (0.3 to 2.8°C/
Min) in increments of 1 or 0.1°F/Min depending on
[d/e]
the service setup screen. The ROM default is 5°F/
Min (2.8°C/MIn).

LWT Control Proportional Gain

LWT Control Proportional Gain:
[d/e]
The range of values is 0 to 100%/F (0 to 180%/C) in
increments of 0.1. The ROM default is 6.0%/F
(10.8%/C).
LWT Control Integral Reset Time
LWT Control Integral Reset Time:
xxx%
The range of values is 5 to 500 Seconds in
increments of 1. The ROM default is 60 sec.
LWT Control Rate Time
LWT Control Rate Time:
The range of values is 0 to 25 in increments of 0.1.
The ROM Default is 0 sec.
x.x%/min
Press (+)(-) to Change Setting
x.x F/min
Press (+)(-) to Change Setting
xxx.x%/F
Factory Default is 6.0%/F & 10.8%/C
Press (+)(-) to Change Setting
Press (+)(-) to Change Setting
xx sec
xx sec
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