Manual 2100-510E
Page
14 of 38
THERMOSTAT INDICATORS
8403-060 (1120-445) Temperature/Humidity Control:
In heating or cooling, the display may be black and light
gray, or backlit in blue depending on configuration. In the
event of a system malfunction such as a loss of charge or
high head pressure, the heat pump control board will issue
a signal to the thermostat causing the screen to be backlit in
RED and the display to read “Service Needed”. If this
occurs, the control will continue to function, but you will
not be able to make any adjustments until the problem is
corrected and the fault device is reset.
WIRING INSTRUCTIONS
GENERAL
All wiring must be installed in accordance with the
National Electrical Code and local codes. In Canada, all
wiring must be installed in accordance with the Canadian
Electrical Code and in accordance with the regulations of
the authorities having jurisdiction. Power supply voltage
must conform to the voltage shown on the unit serial plate.
A wiring diagram of the unit is attached to the inside of the
electrical cover. The power supply shall be sized and fused
according to the specifications supplied. A ground lug is
supplied in the control compartment for equipment ground.
The unit rating plate lists a “Maximum Time Delay Fuse”
or “HACR” type circuit breaker that is to be used with the
equipment. The correct size must be used for proper
circuit protection and also to assure that there will be no
nuisance tripping due to the momentary high starting
current of the compressor motor.
CONTROL CIRCUIT WIRING
The minimum control circuit wiring gauge needed to insure
proper operation of all controls in the unit will depend on
two factors.
1. The rated VA of the control circuit transformer.
2. The maximum total distance of the control circuit
wiring.
Table 6 should be used to determine proper gauge of
control circuit wiring required.
Example:
1. Control Circuit transformer rated at 50 VA
2. Maximum total distance of control circuit
wiring 85 feet.
From Table 6 minimum of 16 gauge wire
should be used in the control circuit wiring.
WALL THERMOSTAT
The following thermostat should be used as indicated,
depending on the application.
TABLE 6
CONTROL CIRCUIT WIRING
f
o
A
V
d
e
t
a
R
t
i
u
c
r
i
C
l
o
r
t
n
o
C
r
e
m
r
o
f
s
n
a
r
T
r
e
m
r
o
f
s
n
a
r
T
y
r
a
d
n
o
c
e
S
V
4
2
@
A
L
F
l
a
t
o
T
m
u
m
i
x
a
M
f
o
e
c
n
a
t
s
i
D
t
i
u
c
r
i
C
l
o
r
t
n
o
C
t
e
e
F
n
i
g
n
i
r
i
W
0
5
1
.
2
5
4
-
e
g
u
a
g
0
2
0
6
-
e
g
u
a
g
8
1
0
0
1
-
e
g
u
a
g
6
1
0
6
1
-
e
g
u
a
g
4
1
0
5
2
-
e
g
u
a
g
2
1
TABLE 7
WALL THERMOSTAT
t
a
t
s
o
m
r
e
h
T
s
e
r
u
t
a
e
F
t
n
a
n
i
m
o
d
e
r
P
0
6
0
-
3
0
4
8
)
5
4
4
-
0
2
1
1
(
t
a
e
H
e
g
a
t
s
3
;
l
o
o
C
e
g
a
t
s
3
c
i
n
o
r
t
c
e
l
E
e
l
b
a
m
m
a
r
g
o
r
P
-
n
o
N
/
e
l
b
a
m
m
a
r
g
o
r
P
l
a
n
o
i
t
n
e
v
n
o
C
r
o
P
H
r
e
v
o
e
g
n
a
h
c
l
a
u
n
a
M
r
o
o
t
u
A
EMERGENCY HEAT MODE
The operator of the equipment must manually place the
system switch in this mode. This is done when there is a
known problem with the unit.
When the 8403-060 (1120-445) Temperature/Humidity
Control is placed in the Emergency Heat mode, the display
will be backlit in RED to indicate that service is needed.
The display will remain backlit in red until the mode is
switched out of Emergency Heat.
