RSMD Technical Guide
INPUTS & OUTPUTS
9
RSMD - Inputs & Outputs
+5V VDC Power
This output is a 5 VDC output that supplies power to the Suction
Pressure Transducers.
SP-1 & SP-2 - Suction Pressure Transducers
The Suction Pressure Sensors are used to measure suction pressure
at the HVAC unit’s DX evaporator coil suction line. This suction
line pressure is converted to saturated refrigerant temperature. The
saturated refrigerant temperature is used to properly control the
compressors to maintain a given Suction Coil (Saturated) Temperature
Setpoint. In Cooling mode, the VCC-X / VCCX2 resets the Suction
Coil (Saturated) Temperature Setpoint to maintain a given supply air
temperature setpoint. In Dehumidifi cation mode, the Suction Coil
(Saturated) Temperature Setpoint is a user confi gurable setpoint that
can be reset based on indoor humidity levels.
+5V VDC Power
This output is a 5 VDC output that supplies power to the Head Pres-
sure Transducer.
HP-1 & HP-2 - Head Pressure Transducers
The Head Pressure Transducers are used to measure Head Pressure at
the discharge line. This Head Pressure is used to drive the Condenser
Fans to maintain a given Head Pressure Setpoint.
TEMP1 & TEMP2 - Compressor Discharge Tem-
perature Sensor 1 & Sensor 2 Input
The Digital Compressor Discharge Temperature Sensors monitor
the discharge temperature from the Digital Compressor to protect
against overheating.
TEMP3 - Leaving Water Temperature Sensor Input
This input monitors the Condenser Leaving Water Temperature and
determines if the water source condenser is operating in a safe water
temperature range.
BIN1 - Compressor Status 1
When this wet contact input closes, a 24 volt signal to Binary Input
#1 indicates that Compressor 1 is running. Typically, the source for
this is relay output 1. If Binary Input 1 opens, Compressor 1 Enable
Relay will de-energize and a Compressor Alarm will be generated.
BIN2 - Compressor Status 2
When this wet contact input closes, a 24 volt signal to Binary Input
#2 indicates that Compressor 2 is running. Typically, the source for
this is relay output 2. If Binary Input 2 opens, Compressor 2 Enable
Relay will de-energize and a Compressor Alarm will be generated
.
BIN3 - Outside 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.
BIN4 - Emergency Shutdown
This wet contact input is used to initiate shutdown of the HVAC unit
when a N.C. 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.
AOUT1 - Condenser Fan 1 Signal
This 0-10 VDC output is used to control/modulate the Condenser 1
Fan /Valve to maintain the Head Pressure Setpoint.
AOUT2 - Condenser Fan 2 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 Water Side Economizer Bypass Actuator.
RLY1 - Compressor 1 Enable
This relay enables the Compressor 1.
RLY2 - Compressor 2 Enable
This relay enables the 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.
RSMD Inputs & Outputs
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