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19
■
TOOLS NEEDED
— The following list includes rec-
ommended tools and devices for working on the heater
section of 52C,P units.
Perform the following steps to remove the Heater
Assembly.
1. DISCONNECT ALL POWER TO UNIT.
2. Remove heater by following instructions in
ACCESSING UNIT COMPONENTS section.
After the heater is removed, examine the heater
as follows to determine if it is operational:
Perform a visual inspection. The heater coil should be
free of breaks. If there are any breaks in the coil,
replacement of the heater assembly is necessary. See
Figure 35.
Coil resistance must also be checked to verify the
heater is operating correctly. The resistance of the
heater coils must meet approximate levels for the
heater to perform at its optimum efficiency. See
Figure 36 for approximate resistance for heaters at
75 F. Before checking the heater coil resistance, be
sure all power to unit is off.
To check resistance, set the volt-ohmmeter selector
switch to the lowest ohms value. Next connect the volt-
ohmmeter leads to each side of the heater coil at the
studs that hold the limit switches in place. Incorrect
readings can be obtained if the wires are not removed
from the limit switches on the heater assembly. If the
resistive reading is infinite or zero, the heater is failed
and replacement is necessary. Reinstall the heater
assembly.
FIGURE 36 — ACCEPTABLE HEATER
RESISTANCE VALUES
Phillips Head Screw Driver
Needle Nose Pliers
Volt-ohmmeter
Nut Driver
5
/
16
-in.
HEATER SIZE
WATTS
VOLTS
ACCEPTABLE RESISTANCE
(Ohms)
2.3 kW
2300
230
20-23
2300
265
28-31
3.4 kW
3400
230
13-16
3400
265
19-21
5.0 kW
5000
230
9-11
5000
265
13-15
FIGURE 35 — HEATER COIL (Removed)
Содержание P
Страница 32: ...52C P SERIES 32 FIGURE 58 52CQ TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT PUMP UNITS ...
Страница 33: ...33 FIGURE 59 52CE TYPICAL WIRING SCHEMATIC FOR STANDARD HEAT COOL UNITS ...
Страница 34: ...52C P SERIES 34 FIGURE 60 52CE TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT COOL UNITS ...
Страница 35: ...35 FIGURE 61 52PC TYPICAL WIRING SCHEMATIC FOR STANDARD COOLING ONLY UNITS ...
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