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UPM BOARD
DEFAULT
SETTINGS--Your
UPM board will
come from the factory with the following
default settings:
--
Freeze--"Terminals
not jumped"
on all the time
--
Temp--26°F
refrigerant
temp set-point
--
Lockout--2
--
Reset--"Y"
--
Alarm--"Pulse"
--
Test--"NO"
--
Hot/Dry
Alarm--
"Normally
Open (NO)"
Considerations
1. Always
check incoming
line voltage
power supply
and sec-
ondary
control voltage
for adequacy.
Transformer
primaries
are dual tapped
for 208 and 230 volts.
Connect
the appro-
priate tap to ensure
a minimum
of 18 volts
secondary
con-
trol 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
sup-
ply.
3. The following
guidelines
are recommended
for wiring
be-
tween
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.
SEQUENCE
OF OPERATION
Cooling
Mode
Energizing
the "0"
terminal energizes
the unit reversing
valve thus
placing
the unit into 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:
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 GB units.
11
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