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262673-UIM-B-0707
Hum Stat Jumper
The HUM STAT jumper configures the control to monitor the humidity
switch input. With the jumper in the NO position, the control will ener-
gize the HUM terminal with 24 VAC continually. With the jumper in the
YES position, the control will monitor the HUM input to control the HUM
OUT output to control an external humidifier.
If the jumper is not present, the control will operate as if the jumper is in
the YES position.
Mode Jumper
The MODE jumper configures the control to operate properly with an air
conditioner (AC position) or heat pump (HP position). With the jumper in
the AC position, the control will energize the O terminal with 24 VAC
continually. With the jumper in the HP position, the O input signal is
received from the room thermostat.
If the jumper is not present, the control will operate as if the jumper is in
the HP position.
SPARE Jumper
The control includes a spare jumper that can be used if a jumper is lost.
The SPARE jumper does not have any effect on the operation of the
control.
Status and Fault Codes
The control includes an LED that displays status and fault codes. These
codes are shown in Table 3. The control will display the fault codes until
power is removed from the control or the fault condition is no longer
present.
TABLE 3: Fault Codes
Fault or Status Condition
Status
No power to control
Normal operation
Control in test mode
Control failure
Limit Faults
Limit switch currently open (not in lockout)
Multiple limit openings with no call for heat
Multiple limit openings during one call for heat
Single long duration limit opening
Multiple long duration limit openings
Fan failure
Wiring Related Faults
Simultaneous call for heating and cooling
Internal Control Faults
Control recovered from internal event
External Relay Outputs
The control includes three outputs to drive external relays having 24
VAC coils. The outputs have a maximum rating of 1.0 Amp pilot duty at
24 VAC.
HUM OUT
The HUM OUT output can be used to drive an external relay or solenoid
(24 VAC coil) to control a humidifier. The output is energized when the
HUM input is energized, the HUM STAT is in the YES position, and the
control has a thermostat call for heating (heat pump or electric heat).
EAC
The EAC output can be used to drive an external relay (24 VAC coil) to
control an electronic air cleaner. The output is energized whenever the
blower relay on the control is energized. Models having a high effi-
ciency non-variable speed motor use the EAC output as an input to the
motor. The EAC output can also be used to drive an electronic air
cleaner relay as long as the load of the EAC relay does not exceed 1.0
Amp. An additional connection to the EAC terminals must be made
using a piggyback terminal or similar device.
6
LOW FAN
The LOW FAN output can be used to drive an external relay (24 VAC
coil) that switches the power input to the motor to a lower speed tap. An
accessory kit is available for this application.
The LOW FAN output is energized when the control has the following
inputs as shown in Table 4.
TABLE 4: Low Fan Control Inputs
Y/Y2 and HUM de-energized with
HUM STAT jumper in YES position
Blower Delays
The control includes the following blower delays as shown in Table 5:
TABLE 5: Blower Delays
Condition
Following call for cooling
Following call for heat pump heating
SECTION VI: LINE POWER CONNECTIONS
Power may be brought into the unit through the supply air end of the
unit (top when unit is vertical) or the left side panel. Refer to Figure 3.
Use the hole appropriate to the unit's orientation in each installation to
bring conduit from the disconnect. The power lead conduit should be
terminated at the electrical control box. Refer to Table 7 to determine
LED1 (RED)
proper wire sizing. To minimize air leakage, seal the wiring entry point at
Flash Code
the outside of the unit.
OFF
2s ON / 2s OFF
Rapid Flash
ON
1
2
3
FIGURE 6: Line Power Connections
4
SECTION VII: BLOWER SPEED
5
CONNECTIONS
6
All air handlers, contain 3-speed blower motors which are prewired to
7
the control board.
Adjust blower motor speed to provide airflow within the minimum and
9
maximum limits approved for evaporator coil, electric heat and outdoor
unit. Speed tap adjustments are made at the motor terminal block, See
Figure 7. Airflow data is shown in Table 8.
Connect motor wires to motor speed tap receptacle for speed desired.
See wiring label for motor wiring details.
FIGURE 7: Blower Speed Connections
Input
G
Continuous Fan operation
Y1 or Y1 and O
First stage compressor operation
Dehumidification during cooling
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND.
GND. LUG
LUG
POWER
SUPPLY
FACTORY WIRED TO
TRANSFORMER
CAP
FACTORY WIRED TO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
HIGH
115 VOLT
MED
BLOWER MOTOR
LOW
Operational Mode
Blower Delay
60 seconds
30 seconds
GND.
Unitary Products Group
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