Trane RTHD - Manual (Page 7)

7 RLC-PRC020-EN
Control Options:
Tracer Summit Communications
Link to factory-installed, tested
communication board, via single twisted-
pair wiring, adds Tracer Summit
communications to the system.
LonTalk LCI-C Interface
LonTalk (LCI-C) communications
capabilities are available, with
communication link via single twisted-pair
wiring to factory-installed, tested
communication board.
External Chilled Water Setpoint
External Chilled Water Setpoint is
communicated to a factory-installed,
tested communication board through a 2-
10Vdc or 4-20mA signal.
External Current Limiting
External Current Limit Setpoint is
communicated to a factory-installed,
tested communication board through a 2-
10Vdc or 4-20mA signal.
External Base Loading
External Base Loading is communicated
to a factory-installed and tested
communication board through a
2-10Vdc or 4-20mA signal.
Ice Making Control
Controls and safeties allow operation
with brine temperatures down to 20°F
(-6.7°C) , and dual setpoints enable both
ice making and daytime comfort cooling.
Options
Programmable Relays
Default-set, factory-installed,
programmable relays allow the operator
to select four relay outputs from a list of
eight. Available relays are: Alarm-
Latching, Alarm-Auto Reset, General
Alarm, Warning, Chiller Limit Mode,
Compressor Running, Head Pressure
Relief Request, and Tracer Control.
Chilled Water Reset – Outdoor Air
Temperature
Controls, sensors, and safeties allow
reset of chilled water temperature, based
on temperature signal, during periods of
low outdoor air temperature (chilled
water reset based on return chilled water
temperature is standard).
Condenser-Regulating Valve Control
Chiller applies a Proportional Integrative
Control (PID) algorithm to control water
regulating valve via 0-10Vdc signal.
Percent of Full Run Load Amps Output
Control system indicates the active chiller
percent of full run load amps, based on a
0-10Vdc signal.
Condenser Pressure Output
Control system indicates chiller
differential pressure or condenser
pressure, based on a 0-10Vdc signal.
Refrigerant Monitor Input
Control system indicates refrigerant
monitor status of 0-100 or 0-1000 ppm
(user selectable), based on a 2-10Vdc /
4-20 mA signal.