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Quest 215 Dual Installation, Operation and Maintenance Instructions
13
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Unit Test to determine problem:
1. Detach field control wiring connections from main unit.
2. Connect the yellow and green pigtails from the main unit together; only the impeller fan should run. Disconnect the wires.
3. Connect the yellow and blue pigtails from the main unit together; the compressor and impeller fan should run.
4. If these tests work, the main unit is working properly. You should check the control panel and field control wiring for problems
next.
5. Remove the control panel from the mounting box and detach it from the field installed control wiring. Connect the blue,
yellow, and green wires from the control panel directly to the corresponding colored pigtails on the main unit. Leave the
violet, white and red wires disconnected!
6. Turn on the fan switch; the impeller fan should run. Turn o the fan switch.
7. Turn on the humidity control; the compressor and impeller fan should run.
8. If these tests work, the problem is most likely in the field control wiring.
8.4 Refrigerant Charging
If the refrigerant charge is lost due to service or a leak, a new charge must be accurately weighed in. If any of the old charge is left
in the system, it must be recovered before weighing in the new charge. Refer to the unit nameplate for the correct charge weight
and refrigerant type.
8.5 Impeller Fan Replacement
The motorized impeller fan is a unitary assembly consisting of the motor and impeller fan. If defective, the complete assembly
must be replaced.
1. Unplug the power cord.
2. Remove the cabinet access panel.
3. Remove the screw attaching the impeller fan support bracket to the base.
4. Disconnect the impeller fan leads inside the electric box.
5. Remove fan/bracket assembly by removing 3 screws from the bracket and inlet ring assembly.
6. Remove the defective impeller fan from the bracket and replace with it with the new impeller fan.
7. Reassemble the new impeller fan by reversing the above procedure. Note: There are two pins on the backside of the cabinet
that must align with the two holes in the impeller fan support bracket.
8.6 Compressor/Capacitor Replacement
This compressor is equipped with a two terminal external overload and a run capacitor, but no start capacitor or relay
(See Figure 4).
8.6A Checking Compressor Motor Circuits
Perform the following tests if the impeller fan runs but the compressor does not with the fan switch and ventilation timer OFF and
the humidity control ON.
1. Unplug the unit; remove the cabinet side and the electrical connection cover on the compressor top.
2. Plug in the unit and turn the humidity control to ON. Check for 220 volts from compressor terminal R to overload terminal
3 using an AC voltmeter. If voltage is present, go to step 3. If no voltage, there may be a loose connection in the compressor
circuit. Test each component for continuity. See the appropriate section if a defect is suspected.
3. Unplug the unit, and then disconnect the red and yellow wires from compressor terminals R & S. Using an ohmmeter check
continuity between the points listed below.
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