8
ze protection
lt setting for the freeze limit trip is
b
l constantly monitor
e refrigerant temperature with the sensor
4. If
the
r down and enter into
nd the Alarm contact will be active. The
Free
The defau
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
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
LED will flash (three (3) times) the code
associated with this alarm condition.
Figure 4
reeze sensor locat
Brownout protection
The UPM controller will constantly monitor
the power supply, if the nominal voltage
tput
be de-energized and the unit will enter
e co
not monitor the power
pply du
first 500 illisecon
f
mpress
p to av
e a
the UPM detects a brownout condition
ive (5) times as error
code indication.
ondensation overflow
tors
e drain pan for high condensate water
impedance drops below 230KΩ +/-
5 % (ONLY when condensate sensor
the correspondent code
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.
drops below 25% of its value. (18 VAC
approximately), the unit will enter brownout
protection mode. The compressor CC ou
will
the soft lockout mode.
Th
ntroller will
su
ring the
m
ds o
co
or start u
oid nois
nd false
alarms.
Once
its fault LED will flash f
C
The UPM controller continuously moni
th
level, and to do so it utilizes a sensor and
identifies an alarm condition when the
sensor’s
1
option is present). Once the UPM senses
this resistance value it enters into a hard
lockout and reports
ion
- F
