
5
AP SERIES
970-292 Revised 5-12
NTE: If the thermostat is provided with a malfunction light
powered off of the common (C) side of the transformer, the
unit must be provided with a malfunction relay ( HP option
# 660-006) to properly energize the light. The relay coil will
be wired across the (ALR) and (C) contacts on the unit’s UPM
board and the relay’s normally open contacts across (ALR)
and the malfunction light connection on the thermostat. If
the thermostat is provided with a malfunction light powered
off of the hot (R) side of the transformer, then the thermostat
malfunction light connection should be connected directly
to the (ALR) contact on the unit’s UPM board.
To the left of the thermostat connection block are a row of
2 red and 4 green LED’s. These LED’s indicate the operating
status of the unit. They are labeled as follows:
EM (red) Emergency Heat On
W1 (red) Auxiliary Heat On
O (green) Reversing Valve Energized, unit is
in cooling mode
Y2 (green) Second Stage Compressor On
Y1 (green) irst Stage Compressor On
G (green) an On
Just above the connector block is a single red LED labeled
C M that will blink intermittently when the unit is running
and may flicker when the unit is off. This LED indicates the
air delivery of the blower at any given time. Each blink of
the LED represent 100 C M of air delivery so if the LED
blinks 12 times, pauses, blinks 12 times, etc. the blower is
delivering 1200 C M. Refer to igure #7 for factory
programmed air delivery settings for the ES Series.
To the right of the thermostat connection block is a green
LED labeled dehumidify.
Just above and to the right of the thermostat connection
block are four sets of jumper pins labeled ADJ, DELAY, HEAT
and COOL. The ADJ set of pins are labeled NORM, (+), (-)
and TEST. AP units will all be set on the NORM position from
the factory, however, airflow can be increased (+) or
decreased (-) by 15% from the pre-programmed setting by
relocating the jumper in this section. The TEST position is
used to verify proper motor operation. If a motor problem
is suspected, move the ADJ jumper to the TEST position and
energize G on the thermostat connection block. If the
motor ramps up to 100% power, then the motor itself is
functioning normally. Always remember to replace the
jumper to NORM, (+) or (-) after testing and reset the unit
thermostat to restore normal operation.
NTE: Do not set the ADJ jumper to the (-) setting when
electric heaters are installed. Doing so may cause the
heaters to cycle on their thermal overload switches,
potentially shortening the life of the switches.
The other three sets of jumper pins are used to select the
proper program in the ECM motor for the unit. Refer to
igure #7 for the proper jumper placement.
N TE: Always disconnect power before changing jumper
positions on the interface board and reset the unit
afterward.
To the left of the red and green status LED’s is a row
of 1/4” male quick connects. These are used to pass
thermostat inputs on to the rest of the control circuit.
Remember to always turn off unit power at the circuit
breaker before attaching or disconnecting any wiring
from these connections to avoid accidental short
circuits that can damage unit control components.
SAFETY DEVICES AND THE UPM C NTR LLER
Each unit is factory provided with a Unit Protection
Module (UPM) that controls the compressor operation and
monitors the safety controls that protect the unit.
Safety controls include the following:
• High pressure switch located in the refrigerant discharge
line and wired across the HPC terminals on the UPM
• Low pressure switch located in the unit refrigerant suction
line and wired across terminals LPC1 and LPC2 on the UPM.
• Optional freeze protection sensor, mounted close to
condensing water coil, monitors refrigerant temperature
between condensing water coil and thermal expansion
valve. If temperature drops below or remains at freeze
limit trip for 30 seconds, the controller will shut down the
compressor and enter into a soft lockout condition. The
default freeze limit trip is 30° , however this can be
changed to 15° by cutting the R42 resistor located on top
of DIP switch SW1.
• The condensate overflow protection sensor is located
in the drain pan of the unit and connected to the
‘COND’ terminal on the UPM board.
N TE: If freeze protection sensor is not installed, a jumper
between freeze contacts must be installed on the UPM
board otherwise unit will not start.
The UPM includes the following features:
•ANTI-SH RT CYCLE TIME—5 minute delay on break
timer to prevent compressor short cycling.
•RAND M 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.
•L W 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.
M T R PR FILE AIR FL W TABLE CFM
TWO STAGE UNITS
FAN Y1 Y2 AUX. EMERG. PLUS MINUS TAP
MODEL ONLY
COOL/HEAT COOL/HEAT
HEAT HEAT ADJ ADJ
COOL/HEAT/DELAY
AP025 600 750 950 950 950 1090 800 A
AP035 900 1000 1200 1200 1200 1400 1000 A
AP049 1200 1300 1700 1700 1700 1950 1450 B
AP061 1300 1500 2000 2000 2000 2100 1900 A
AP071 1300 1500 2100 2100 2100 2300 1900 A
( igure #7)