Manual 2100-347F
Page
17 of 24
THERMOSTAT INDICATORS
1F93-380 (8403-045) Thermostat:
In heating and cooling, the LED will illuminate green
for first stage and yellow for second stage. The same
LED will illuminate red for Emergency heating mode
and will flash red if there is a malfunction in the system.
The Malfunction indicator is accomplished by a relay
output from the heat pump control board. A condition,
such as loss of charge or high head pressure, will cause
the flashing red light to activate. This is a signal to the
operator of the equipment to place system in the
emergency heat position.
TH5220D1151 (8403-058) Thermostat:
Thermostat will display on the screen “Em Heat” when
the thermostat is set on emergency heat.
TABLE 4
WALL THERMOSTAT AND SUBBASE COMBINATIONS
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
8
5
0
-
3
0
4
8
)
1
5
1
1
D
0
2
2
5
H
T
(
t
a
e
h
e
g
a
t
s
2
;
l
o
o
c
e
g
a
t
s
2
e
l
b
a
m
m
a
r
g
o
r
P
-
n
o
N
c
i
n
o
r
t
c
e
l
E
r
e
v
o
e
g
n
a
h
c
l
a
u
n
a
M
r
o
o
t
u
A
9
4
0
-
3
0
4
8
)
0
8
3
-
3
9
F
1
(
t
a
e
h
e
g
a
t
s
3
;
l
o
o
c
e
g
a
t
s
2
c
i
n
o
r
t
c
e
l
E
e
l
b
a
m
m
a
r
g
o
r
P
r
e
v
o
e
g
n
a
h
c
l
a
u
n
a
M
r
o
o
t
u
A
