Trane RTHD

68 RTHD-SVX01D-EN
Installation Electrical
When making field connections, refer to the appropriate field layout, wiring,
schematics and controls diagrams that ship with the unit. The diagrams in this
manual are typical only and may not match the unit.
Whenever a contact closure (binary output) is referenced, the electrical rating
is:
Whenever a dry contact input (binary input) is referenced, the electrical rating
is 24VDC, 12 mA.
Whenever a control voltage contact input (binary input) is referenced, the
electrical rating is 120 VAC, 5mA.
NOTE: Asterisked connections require the user to provide an external
source of power. The 115V control power transformer is not sized for
additional load.
Chilled Water Pump Control
CH530 has a evaporator water pump output relay that closes when the chiller
is given a signal to go into the Auto mode of operation from any source. The
contact is opened to turn off the pump in the event of most machine level
diagnostics to prevent the build up of pump heat. To protect against the
build-up of pump heat for those diagnostics that do not stop and/or start the
pump and to protect against the condition of a bad flow switch, the pump
shall always be stopped when the evaporator pressure is seen to be close to
the Low Side Evaporator Pressure relief valve setting.
Chilled Water Flow Interlock
CH530 has an input that will accept a contact closure from a proof-of-flow
device such as a flow switch. The flow switch is to be wired in series with
the chilled water pump starter's auxiliary contacts. When this input does not
prove flow within 20 minutes relative to transition from Stop to Auto modes
of the chiller, or if the flow is lost while the chiller is in the Auto mode of oper-
ation, the chiller will be inhibited from running by a non-latching diagnos-
tic.The flow switch input shall be filtered to allow for momentary openings
and closings of the switch due to turbulent water flow. This is accomplished
with a 6 seconds filtering time. The sensing voltage for the condenser water
flow switch is 115/240 VAC
IMPORTANT! DO NOT cycle the chiller through starting and stopping the
chilled water pump. This could cause the compressor to shut down fully
loaded. Use the external stop/start input to cycle the chiller.
Condenser Water Pump Control
CH530 provides a contact closure output to start and stop the condenser
water pump. If condenser pumps are arranged in a bank with a common
header, the output can be used to control an isolation valve and/or signal
another device that an additional pump is required.
At 120 VAC 7.2 amp resistive
2.88 amp pilot duty
1/3 hp, 7.2 FLA, 43.2 LRA
At 240 VAC 5.0 amp resistive
2.0 amp pilot duty
1/3 hp, 3.6 FLA, 21.6 LRA