N
OTE:
The blower motor will remain active during a
lockout condition.
•
UPM BOARD DEFAULT SETTINGS—Your UPM
board will come from the factory with the following
default settings:
•
F
reeze
—“Terminals not jumped” on all the time
•
Temp—30°F
•
Lockout—2
• Reset—“Y”
•
Alarm—“PULSE”
•
Test—“NO”
•
Dry Contact—“Normally Open (NO)”
CONSIDERATIONS
1. Always check incoming line voltage power supply and
secondary control voltage for adequacy. Transformer
primaries are dual tapped for 208 and 230 volts.
Connect the appropriate tap to ensure a minimum of
18 volts secondary control voltage. 24 volts is ideal for
best operation.
2. Long length thermostat and control wiring leads may
create voltage drop. Increase wire gauge or up-size
transformers may be required to insure minimum
secondary voltage supply.
3. FHP recommends the following guidelines for wiring
between a thermostat and the unit: 18 GA up to 60
foot, 16 GA up to 100 ft and 14 GA up to 140 ft.
4. Do not apply additional controlled devices to the
control circuit power supply without consulting the
factory. Doing so may void equipment warranties.
5. Check with all code authorities on requirements
involving condensate disposal/over flow protection
criteria.
S
EQUENCE OF OPERATION
Cooling Mode
See Typical Wiring Diagram page 24. Energizing the “O”
terminal energizes the unit reversing valve in the cooling
mode. The fan motor starts when the “G” terminal is
energized.
When the thermostat calls for cooling (Y), the loop pump or
solenoid valve if present is energized and compressor will
start.
Once the thermostat is satisfied, the compressor shuts
down accordingly and the fan ramps down to either fan
only mode or off over a span of 30 seconds (ECM Motors).
Note that a fault condition initiating a lockout will de-
energize the compressor.
Heating Mode
Heating operates in the same manner as cooling, but with
the reversing valve de-energized. The compressor will run
until the desired setpoint temperature on the thermostat is
achieved.
Once the thermostat is satisfied, the compressor shuts
down and the fan ramps down in either fan only mode or
turns off over a span of 30 seconds. Auxiliary electric
heating coils are not available on the AP product line.
UNIT OPTIONS
HOT GAS REHEAT (HGR)
Hot gas reheat allows the user to not only control space
temperature, but also humidity levels within the
conditioned space. An excess of moisture in the space can
allow mold growth leading to damage in the structure or
interior surfaces as well as reducing the air quality and
creating an unhealthy environment.
The typical control of a unit is by a thermostat that senses
the temperature in the space. By utilizing a humidistat in
addition to the thermostat we are able to monitor the
humidity levels in the space as well. The HGR option allows
cooling and dehumidification to satisfy both the
thermostat and humidistat.
7
AP SERIES
970-292 Revised 5-12
AP SERIES
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