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14 | Installation
If 24 VAC output is needed. R must be wired to
ALR-COM terminal; 24 VAC will be available to the
ALR-OUT terminal when the unit is in the alarm
condition.
•
DISPLAY OUTPUT: The display output is a pulse
output connected to the Unit Diagnostics Display
(UDD) and it pulses 24VAC when the unit is in an
lockout alarm condition.
•
TEST DIP SWITCH: A test dip switch is provided to
reduce all time delays settings to 10 seconds during
troubleshooting or verification of unit operation. In
test mode the fault LED will flash 5 times in cooling
or 3 times in heating for five minutes.
NOTICE: Operation of unit in test mode can
lead to accelerated wear and premature
failure of components. The "TEST" switch
must be set back to "NO" after
troubleshooting/servicing.
Table 4: UPM Fault Blink Codes
LED Blinks
Fault
None
None
1
High Pressure
2
Low Pressure
Water Coil
3
Freeze
Condition
4
Condensate
Overflow
5
Air Coil Freeze
Condition
6
Brown Out
UPM Board Factory Default Settings
TEMP
LOCKOUT
RESET
ALARM
TEST
8 733 944 336 (2016/09)
Fault Criteria
All fault conditions
nominal
Refrigerant discharge
pressure has
exceeded 600 PSIG
Refrigerant suction
pressure has fallen
below 40 PSIG
Refrigerant
temperature to the
water coil has fallen
below 26°F for 30
seconds
Condensate levels in
the unit drain pan are
too high
Refrigerant
temperature to the air
coil has fallen below
26°F for 30 seconds
Control voltage has
fallen below 18 VAC
26°F
2
Y
PULSE
NO
Subject to change without prior notice
Freeze Sensor
The default setting for the freeze limit trip is 26
(sensor number 1); however this can be changed to 15
by cutting the R30 resistor located on top of the DIP
switch SW1, freeze limit trip should only be changed to
15°F when a closed loop system with appropriate
antifreeze mixture is used.Since freeze sensor 2 is
dedicated to monitor the evaporator coil it is
recommended to leave the factory default setting on the
board. The complete UPM controller will constantly
monitor the refrigerant temperature with the sensor
mounted close to the condensing water coil between the
thermal expansion valve and water coil. If temperature
drops below or remains at the freeze limits for 30
seconds. The controller will shut the compressor down
and enter into a soft lockout condition. Both the status
LED and the alarm contact will be active. The LED will
flash three times the code associated with this alarm
condition. If this alarm occurs 2 times (or 4 if DIP switch
is set to 4) within an hour the complete UPM controller
will enter into a hard lockout condition. It will constantly
monitor the refrigerant temperature with the sensor
mounted close to the evaporator between the thermal
expansion valve and evaporator coil as shown in figure #
11
If temperature drops below or remains at the freeze limit
trip for 30 seconds, the controller will shut the
compressor down and enter into a soft lockout
condition. Both the status LED and the alarm contact
will be active. The LED will flash three times the code
associated with this alarm condition. If this alarm occurs
2 times (or 4 if DIP switch is set to 4 within an hour the
controller will enter into a hard lockout condition.
NOTICE: It is recommended to have a flow
switch to prevent the unit from running if
water flow is lost.
Intelligent Reset
If a fault condition is initiated, the 5 minute delay on
break time period is initiated and the unit will restart
after this delays expire and if the fault condition has
been resolved. During this period the fault LED will
indicate the cause of the fault. If the fault condition still
exists or occurs 2 or 4 times (depending on 2 or 4
settings for lockout dip switch) before 60 minutes, the
unit will go into a hard lockout and requires a manual
lockout reset. A single condensate overflow fault will
cause the unit to go into hard lockout immediately, and
will require a manual lockout reset.
Lockout Reset
A hard lockout can be reset by turning the unit
thermostat off and then back on. When the RESET dip
switch is set to "Y" or by shutting off power at the circuit
breaker when the RESET DIP switch is set to "R".
LV Heat Pump Series
°
F
°
F
LV Heat Pump Series
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