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RSMD-CM Technical Guide
INPUTS AND OUTPUTS
Inputs and Outputs
BI2 - Compressor Status 2
If wired non-tandem: When this wet contact input closes, a 24
volt signal to BI2 indicates Compressor 2 is running. If BI2
(Compressor Status Input) becomes de-energized while the
compressor is running, a high pressure alarm will be triggered.
The high pressure switch and low pressure switch are in
series. Check both switches if an alarm occurs. The alarm will
de-energize the compressor output for two minutes and then
re-energize the output.
If wired in tandem: When this wet contact input closes, a 24
volt signal to BI2 indicates that Compressor 2 is running. If
BI2 (Compressor Status Input) becomes de-energized while the
compressor is running, a compressor alarm will be triggered
and the compressor will de-energize RLY2, shutting down the
compressor, and lock it out.
BI3 - Outdoor Coil Temperature/Proof of Water Flow
Status
This input can be used for the following two options:
•
Air to Air Heat Pump:
This wet contact input monitors
a Defrost Coil Temperature Switch on air to air heat
pump units. If the compressors are operating in the
Heating Mode and this switch closes, it will initiate a
Defrost Mode.
•
Water Source Heat Pump:
This wet contact input is for
the Water Proof of Flow Switch. If the Water Proof of
Flow Switch contact opens while the condenser valve is
operating, the controller will react to protect the system
depending on the current mode of operation.
BI4 - Emergency Shutdown
This wet contact input is used to initiate shutdown of the HVAC
unit when a normally closed Smoke Detector (by others), Firestat
(by others), or other shutdown condition (by others) contact is
opened. The controller remains active and can initiate alarm
relays.
NOTE:
The binary inputs require wet contacts (24 VAC
only) to recognize an active input. If you provide
dry contacts, the contact closure will not be
recognized.
AO1 - Condenser 1 Fan Signal
This 0-10 VDC output is used to control/modulate the Condenser
1 Fan /Valve to maintain the Head Pressure Setpoint.
AO2 - Condenser 2 Fan Signal or Waterside
Economizer Bypass Actuator Valve
This 0-10 VDC output is used to control/modulate the Condenser
2 Fan /Valve to maintain the Head Pressure Setpoint or this output
signal is a Direct Acting 2-10 VDC output signal that is used to
modulate the waterside Economizer Bypass Actuator.
RLY1 - Compressor 1 Enable
This relay enables Compressor 1.
RLY2 - Compressor 2 Enable
This relay enables Compressor 2.
RLY3 - Condenser 1 Enable
This relay enables the Condenser 1 Fan/Water Valve.
RLY4 - Condenser 2 Enable
This relay enables the Condenser 2 Fan/Water Valve.
RLY5 - Reversing Valve Enable
This relay enables the Reversing Valve.
Summary of Contents for RSMD-CM
Page 1: ...RSMD CM Technical Guide ...
