23
OPERATION
When heating or cooling calls are sent to the
RMOD
Relay Module by the
thermostat, the
RMOD
will treat these calls as votes to determine mode
When configured for Heat Pump operation, the cut-out is automatically
COOL CALLS
If the majority of calls are for cooling, the
RMOD
will energize Y1 and G
for 1st stage cooling. After 4 minutes, the
RMOD
will check the leaving
provided for compressor safety.
HEAT CALLS
If the majority of calls are for heating, the
RMOD
will energize W1 for 1st
stage heating. The
RMOD
will bring on additional stages in 3-minute
increments. See Gas Electric and Heat Pump staging.
CHANGEOVER
If the system is running in one mode and the majority of calls changes
to the other mode, a timer will start. The
RMOD
will give the current
operating mode another 4 minutes to try to satisfy the zone(s). It will
then go into the purge cycle before switching modes to the majority.
PURGE MODE
When a heat or cool call is satisfied, or before changing modes, the
RMOD
will go into a 3-minute purge cycle. The call for heat or cool will
be removed, and the dampers close.
VENTILATION MODES
The
RMOD
can be field configured for FAN Constant in the Occupied
mode or FAN Automatic. When all zones are satisfied, dampers will
modulate to 50% open.
EMERGENCY HEAT
Selected by the on-board switch or remote switch.
COMMUNICATION FAILURE
If the
RMOD
loses communications, it will then control the HVAC unit
based on the return air temperature. The
RMOD
will maintain 70° F heat
and 75° F cool as measured by the MIX Air sensor in the return air.
TEMPERATURE LIMITS AND STAGING
The
RMOD
monitors the leaving air temperature for staging and Hi /Low
145° F. Staging is based on the limit settings.
Gas Electric & Heat Pump
Example:
Gas Electric
Heating
W2 cut-in temperature is high limit minus 15° F (145° - 15°
= 130° F). The W2 cut-out is cut-in plus 10° F (130° + 10° = 140° F).
Example:
Adjustable high limit = 145° F
W2 Cut-in = 130° F (high limit minus fifteen)
W2 Cut-out = 140° F (cut-in plus ten)
W1 cut out = 145°
Heat Pump
Heating
– When the
RMOD
is configured for HP operation, the high
cut-out is automatically set to 121°.
• W2 energizes when the SA temperature is 88° or less after 4 minutes
of run time. W2 de-energizes when the SA temperature rises to 100°.
• Y2 energizes when the SA temperature is below 100° after 2 minutes
of run time and de-energizes above 115°.
• Y1 cuts out for 4 minutes when the SA temperature is above 120°.
TEMPERATURE LIMIT ADJUSTMENT
The high and low cut-out temperatures are field adjustable.
HVAC unit operation.
RMOD SEQUENCE OF OPERATION
NOTE: The RA and LV AIR sensors (P#
LAT
) must be installed for
of operation. Adjustable factory limits are 45°F cool and 145°F heat.
set for 121° heat.
at 45° F. Four-minute minimum run and four-minute off delays are
limit. The adjustable factory low limit is 45° F and the high limit is
Cooling
Y2 cut-in temperature is low limit plus 10°F (45°+ 10°= 55°F).
The Y2 cut-out is cut-in minus 8° F (55° – 8° = 47° F).
Adjustable low limit = 45° F
Y2 Cut-in = 55° F (low limit plus ten)
Y2 Cut-out = 47° F (cut-in minus eight)
energize. Y2 will stage off at 47° F and Y1 will stage off on low temperature
air temperature. If the leaving air temperature is above 55° F, then Y2 will
