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safety devices and the uPM controller
The UPM includes the following features:
• aNti-sHort cycle tiMe—5 minute delay on
break timer to prevent compressor short cycling.
• raNdoM start—Each controller has a unique
random start delay ranging from 270 to 300 seconds to
reduce the chances of multiple units simultaneously
starting after initial power up or after a power
interruption, creating a large electrical spike.
• loW Pressure ByPass tiMer—If the compressor is
running and the low pressure switch opens, then the
control will keep the compressor on for 120 seconds.
After 2 minutes if the low pressure switch remains
open, the control will shut down the compressor and
enter a soft lockout. The compressor will not be
energized until the low pressure switch closes and the
anti-short cycle time delay expires. If the low pressure
switch opens 2–4 times in 1 hour, the unit will enter a
hard lock out and need to be reset.
• BroWNout/surGe/PoWer iNterruPtioN
ProtectioN—The brownout protection in the UPM
board will shut down the compressor if the
incoming power falls below 18 VAC. The compressor
will remain off till the voltage goes above 18 VAC and
the anti short cycle timer (300 seconds) times out.
The unit will not go into a hard lockout.
• MalFuNctioN outPut—Alarm output is Normally
Open (NO) dry contact. If 24 VAC output is needed
R must be wired to the ALR-COM terminal; 24VAC
will be available on the ALR-OUT terminal when the
unit is in alarm condition. If pulse is selected the
alarm output will be pulsed. The fault output will
depend on the dip switch setting for "ALARM". If it
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 explanations. The remote device must have a
malfunction detection capability when the UPM
board is set to "PULSE".
• test diP sWitcH—A test dip switch is provided
to reduce all time delay settings to 10 seconds
during troubleshooting or verifi cation of unit
operation. Note that operation of the unit while in
test mode can lead to accelerated wear and
Revised 05-12
Caution
Subject to change without prior notice
premature failure of the unit. The "TEST" switch
must be set back to "NO" for normal operation.
• FreeZe seNsor—The freeze sensor input is
active all the time, if a freeze option is not selected
the freeze terminals will need a jumper. There are
2 confi gurable freeze points, 30°F & 15°F. The unit
will enter a soft lock out until the temperature
climbs above the set point and the anti-short cycle
time delay has expired. The freeze sensor will shut
the compressor output down after 90 seconds of
water fl ow loss and report a freeze condition. It is
recommended to have a fl ow switch to prevent the
unit from running if water fl ow is lost.
If unit is employing a fresh water system (no
anti-freeze protection), it is extremely important to
have the "Freeze" jumper R42 resistor set to 30°F
in order to shut down the unit at the appropriate
leaving water temperature and protect your heat
pump from freezing if a freeze sensor is included.
• l.e.d. Fault iNdicatioN—Two L.E.D. indicators
are provided:
• Green: Power L.E.D. indicates 18—30 VAC
present at the board.
• Red: Fault indicator with blink codes as follows:
- One blink—High pressure lockout
- Two blinks—Low pressure lockout
- Three blinks—Freeze sensor lockout
- Four blinks—Condensate overfl ow
- Five blinks—Brownout
• 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 overfl ow fault will cause
the unit to go into a hard lockout immediately, and
will require a manual lockout reset.
6 720 220 045
cP/BP series
9
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