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Free
ze protection
The defau
lt setting for the freeze limit trip is
30°F, however this can e changed to 15°F
by cutting the R42 resistor located on top of
the DIP switch SW1.
The UPM controller wil
th
e refrigerant temperature with the sensor
mounted close to the condensing water coil
between the thermal expansion valve and
water coil as shown in figure
temperature drops below or remains at
freeze limit trip for 30 seconds, the controller
will shut the compresso
a soft lockout condition. Both the status LED
a
nd the Alarm contact will be active. The
LED will flash (three (3) times) the code
associated with this alarm condition.
Figure 4
- F
reeze sensor locat
Brownout protection
The UPM controller will constantly monitor
the power supply, if the nominal voltage
b
l constantly monitor
4. If
the
r down and enter into
ion
drops below 25% of its value.
approximately), the unit will enter brownout
protection mode. The compressor CC ou
will
be de-energized and the unit will enter
the soft lockout mode.
Th
e co
ntroller will
su
pply du
ring the
first 500
co
mpress
or start u
p to av
alarms.
Once
the UPM detects a brownout condition
its fault LED will flash f
code indication.
C
ondensation overflow
The UPM controller continuously moni
th
e drain pan for high condensate water
level, and to do so it utilizes a sensor and
identifies an alarm condition when the
sensor's
impedance drops below 230KΩ +/-
1
5 % (ONLY when condensate sensor
option is present). Once the UPM senses
this resistance value it enters into a hard
lockout and reports
via its status LED (4 flashes).
To exit the hard lockout water has to return
to its normal level the UPM has to be reset
by removing the power from the Y terminal
(R if set on the DIP switch) the compressors
will be turned on after anti short cycle
expires.
(18 VAC
not monitor the power
m
illisecon
ds o
oid nois
e a
nd false
ive (5) times as error
the correspondent code
tput
f
tors
8
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