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
d
evice 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 verification of unit operation. Note
that operation of the unit while in test mode can lead
to accelerated wear and 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 configurable
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 flow loss and report a freeze
condition. It is recommended to have a flow switch to
prevent the unit from running if water flow is lost.
NOTE: 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 overflow
- 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 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”.
970-292 Revised 5-12
Freeze Protection Sensor
6
AP SERIES
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