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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
R
C
IAQ
HUM
AI1
D01
TMP
D02
UNIT CONTROLLER
J298
Balance Point Setpoint
When outdoor air temperature is above setpoint (35
F
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
35
F, 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.
