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20 | Electrical
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MALFUNCTION OUTPUT: Alarm output is Normally
Open (NO) dry contact. If pulse is selected the alarm
output will be pulsed. The fault output will depend
on the dip switch setting for "ALARM". If it is set to
"CONST", a constant signal will be produced to
indicate a fault has occurred and the unit requires
inspection to determine the type of fault. If it is set
to "PULSE", a pulse signal is produced and a fault
code is detected by a remote device indicating the
fault. See L.E.D Fault Indication below for blink code
explanation. The remote device must have a
malfunction detection capability when the UPM
board is set to "PULSE".
If 24 VAC output is needed, R must be wired to
ALR-COM terminal; 24 VAC will be available o 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 Diagnostic 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.
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.
•
FREEZE SENSOR: The default setting for the freeze
limit trip is 26°F (sensor number 1); however this
can be changed to 15°F by cutting the R30 resistor
located on top of the DIP switch SW1. The default
setting for the freeze limit trip is 26°F (sensor
number 1); however this can be changed to 15°F by
cutting the R24 resistor located on top of the DIP
switch SW1. Since freeze sensor 2 is dedicated to
monitor the evaporator coil it is recommended to
leave the factory default setting on the board
.
NOTICE: Do not cut freeze sensor 2
The UPM controller will constantly monitor the
refrigerant temperature with the sensor mounted
closer to the condensing water coil between the
thermal expansion valve and water coil. 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 (3)
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 UPM controller
8733942411 (2017/07)
will enter into a hard lockout condition. Sensor
number 2 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 #5. 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 (six (6)
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: Do not cut freeze sensor 2
NOTICE: Freeze sensor will not guard
against the loss of water. Flow switch is
recommended to prevent unit from running
if water flow is lost or reduced.
•
INTELLIGENT RESET: If a fault condition is initiated,
the 5 minute delay on break time period is initiated
and the unit will restart after these delays expire.
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 setting 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 a 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 unit power at the circuit breaker when
the "RESET" dip switch is set to "R".
The blower motor will remain active during a lockout
condition.
Subject to change without prior notice
SM Series Heat Pump
SM Series Heat Pump
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