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LHT/LDT024, 036, 048, 060
FIGURE 15
FIELD WIRING WITH ELECTRONIC AND ELECTRO-MECHANICAL THERMOSTATS
(Thermostat Mode)
J262C
10
11
12
P297
J297A
1
2
B
3
4
5
6
7
8
C
9
10
24 V POWER
W1
W2
P262
A55
R
OCP
C
G
W1
W2
Y1
Y2
2
K55
B
A
K55−1
7
5
2
S86
R
OCP
C
G
W1
W2
Y1
Y2
TO R
TO G
TO Y1
TO PROVIDE SUPERMARKET REHEAT SCHEME
USE S86 DEHUMIDISTAT AND K55.
ALL OTHER THERMOSTAT
SIGNALS REMAIN CONNECTED
AS SHOWN ON THE RIGHT.
TO UNIT CONTROLLER
2
THERMOSTAT INPUTS
FIGURE 16
FIELD WIRING IN ZONE SENSOR MODE
(Zone Sensor Mode)
A2 SENSOR
OUTPUTS
SENSOR
SENSOR
24VAC
RC
IAQ
HUM
AI1
D01
TMP
D02
UNIT CONTROLLER
J298
Balance Point Setpoint
When outdoor air temperature is above setpoint (35F
default), the unit will operate in heat pump mode. When
outdoor air temperature falls below setpoint, the unit will
operate in gas heat mode.
Note - Only stage one is used; stage 2 is not used.
Although the recommended balance point setpoint is
35F, the setpoint can be adjusted. Weigh the comfort /
cost benefit when increasing the setpoint.
Unit Power-Up
A-General
1- Make sure that unit is installed in accordance with the
installation instructions and applicable codes.
2- Inspect all electrical wiring, both field and factory
installed, for loose connections. Tighten as required.
3- Check to ensure that refrigerant lines do not rub against
the cabinet or against other refrigerant lines.
4- Check voltage at main unit power connection.
Voltage must be within range listed on nameplate. If
not, consult power company and have voltage
condition corrected before starting unit.
5- Make sure filters are in place before start‐up.
6- Make sure there is no heating, cooling, or blower
demand from thermostat. Apply power to unit.
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