10MHGRVX-B2 Module Technical Guide
INPUTS AND OUTPUTS
Outputs
Relay Outputs
FAN: Fan Enable
When a call for Dehumidication, Cooling Override, or Heating
Override is received, this relay will be closed to energize the HVAC
unit Supply Fan.
CMP: Compressor Enable
When a call for Dehumidication or Cooling Override is received,
this relay will be closed to energize the Compressor(s).
VALVE: Flush Active Signal / Compressor 2
If congured as Flush, this relay will be active any time a Flush
Cycle is active. When the Flush Cycle ends this relay will turn o
until the next ush occurs.
If congured as Compressor 2, this relay will be used to control
a second Compressor when there is a call for Dehumidication.
Compressor 2 will come on 30 seconds after the rst Compressor
activates. Compressor 2 has a minimum run time of 10 minutes,
and will turn o if the Reheat Valve is at 100% and the Supply Air
Temperature is 5°F below setpoint for one minute. After being o
for 10 minutes, it can come back on if the Supply Air Temperature
is 5°F above setpoint and the valve is at 0%.
AUX: Two-Position HGR Valve / Reversing Valve
If congured as standard, this relay will be used to control a two-
position HGR valve. Used on larger capacity systems that have an
optional two-position HGR Valve in addition to the Modulating
HGR Valve. When a call for Dehumidication is received, if the
modulating HGR valve is at 100% and the Supply Air Temperature is
at least 5°F below setpoint, this relay output will energize to enable
the two-position HGR valve. The relay will de-energize when the
modulating HGR valve closes to 0% and the Supply Air Temperature
is at least 5°F above setpoint.
The modulating valve is then enabled to modulate to maintain the
Supply Air Temperature Setpoint.
If congured as Reversing Valve, this relay will control a Reversing
Valve on a Heat Pump unit. Any time there is a call for Cooling or
Dehumidication, this relay will be energized.
COM: Relay Common
Requires 24 VAC from transformer.
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