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24
UPM Dip Switch Settings — The DIP switches are used to
configure most of the available features of the UPM as follows:
• Lockout mode: two (2) or four (4) strikes
• Reset mode: Y signal or R signal
• Alarm mode: Constant or Pulse
• Test mode: Normal or Test operation
Figure 23 shows the factory default settings for most heat
pump applications. However, the unit wiring diagram is the
ultimate guide for factory DIP switch default settings.
Fig. 23 — Typical DIP Switch Factory Defaults
Table 10 shows the available options on the UPM board
DIP switch banks.
Table 10 — UPM DIP Switch Options
Freeze Sensor — The default setting for the freeze limit trip is
30°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. Since freeze sensor 2 is dedicated to monitor the evapo-
rator coil it is recommended to leave the factory default setting
on the board. The UPM board will constantly monitor the re-
frigerant temperature with the sensor mounted close to the con-
densing 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 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 board 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 Fig. 21. 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 oc-
curs 2 times (or 4 if DIP switch is set to 4) within an hour the
controller will enter into a hard lockout condition.
Intelligent Reset — If a fault condition is initiated, the 5 min-
ute 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 sin-
gle 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”.
Selectable Alarm Mode — The UPM board can be config-
ured to have either a constant or pulse signal. If constant
(CONT) is selected the UPM will provide a closed contact at
the alarm output until the alarm is cleared. If pulsed (PULSE)
is selected the UPM will sequence the alarm contact with the
fault LED flashes.
Test Mode (TEST) — In test mode the ASC and Random
Start time delays are reduced (5 seconds and 10 seconds
respectively), and serve no function to the end user equipment.
The alarm and display relays also pulse for both soft and hard
lockout conditions, and are both cleared through a manual
reset.
UPM Sequence of Operations — Figure 24 shows the UPM
sequence of operations.
IMPORTANT: 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 con-
dition.
SWITCH
NUMBER
DIP SWITCH
ON
OFF
4
LOCKOUT
4
2
3
RESET
R
Y
2
ALARM
CONT
PULSE
1
TEST
YES
NO
CAUTION
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.
IMPORTANT: It is recommended to have a flow switch to
prevent the unit from running if water flow is lost.