Manual 2100-408C
Page
14
EMERGENCY HEAT POSITION
The operator of the equipment must manually place the
system switch in this position. This is done when there
is a known problem with the unit, or when the red LED
comes on indicating a problem.
COMPRESSOR MALFUNCTION LIGHT
Actuation of the red LED is accomplished by a relay
output from the heat pump control board which is
factory installed. Any condition such as loss of charge,
high head pressure, etc., that will prevent compressor
from operating will cause the red LED to come on. This
is a signal to the operator of the equipment to place
system in emergency heat position.
COMPRESSOR CUT OFF THERMOSTAT
AND OUTDOOR THERMOSTATS
Heat pump compressor operation at outdoor
temperatures below 0° F are neither desirable nor
advantageous in terms of efficiency. Since most
equipment at time of manufacture is not designated for
any specific destination of the country and most of the
equipment is installed in areas not approaching the
lower outdoor temperature range, the compressor cutoffs
are not factory installed.
Outdoor thermostats are available to hold off various
banks of electric heat until needed as determined by
outdoor temperature. The set point of either type of
thermostat is variable with geographic region and sizing
of the heating equipment to the structure. See Figures 9
and 10. Utilization of the Heating Application Data and
the heat loss calculation of the building are useful in
determining the correct set points.
TABLE 3
WALL THERMOSTATS
t
a
t
s
o
m
r
e
h
T
s
e
r
u
t
a
e
F
t
n
a
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i
m
o
d
e
r
P
2
4
0
-
3
0
4
8
)
0
7
0
1
G
1
1
5
8
T
(
t
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h
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g
a
t
s
2
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g
a
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1
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l
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m
m
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-
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N
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M
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A
9
4
0
-
3
0
4
8
0
8
3
-
3
9
F
1
t
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e
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t
s
3
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7
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TABLE 2
THERMOSTAT WIRE SIZE
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A
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A
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5
5
3
.
2
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0
2
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8
1
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6
1
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4
1
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2
1
5
4
0
6
0
0
1
0
6
1
0
5
2
FOR UNITS EQUIPPED WITH 1F93-380
THERMOSTAT (8403-049)
THERMOSTAT INDICATOR LAMPS
The LED comes on and stays on whenever the system
switch is placed in the emergency heat position. The
LED will flash red if there is any problem that prevents
the compressor from running when it is supposed to be.
EMERGENCY HEAT POSITION
The operator of the equipment must manually place the
system switch in this position. This is done when there
is a known problem with the unit, or when the red
flashing LED comes on indicating a problem.
COMPRESSOR MALFUNCTION LIGHT
Actuation of the flashing red LED is accomplished by a
relay output from the heat pump control board which is
factory installed. Any condition such as loss of charge,
high head pressure, etc., that will prevent compressor
from operating will cause the red LED to flash. This is
a signal to the operator of the equipment to place system
in emergency heat position.
FOR UNITS EQUIPPED WITH T8511
THERMOSTAT (8403-042)
THERMOSTAT INDICATOR LAMPS
The red LED will come on if there is any problem that
prevents the compressor from running when it is
supposed to be.
