Desa R35D Service Manual page 16

Hot Surface Ignition Models Service Manual
6 Defective Ignition Control Assembly
Disconnect motor wires from control. Attach voltmeter
leads to motor terminals on control. Use 0 to 200 V.A.C.
scale on meter. Plug power cord into a 120V/60 Hz
grounded outlet. Meter should read 0 volts for five sec-
onds, 120 volts for 3 to 4 seconds, then drop to 0 volts. If
the meter remains at 0 volts, the control is defective and
should be replaced.
7 Defective Start/Run Capacitors
Motors used in 70,000 to 200,000 Btu model heaters are
the Permanent Start Capacitor (PSC) type and are
equipped with an integral start/run capacitor. If the resis-
tance of the motor windings read correctly and the igni-
tion control assembly is found to be working properly,
the capacitor may be "open" circuit. The capacitor is wired
internally and cannot be replaced. No service parts are
available and entire motor assembly should be replaced.
8 Improper Voltage Input to Heater
The specified voltage operating range for this product is
108 to 132 volts (rms) 60 hertz. Verify that the voltage
applied to the heater while the motor is running is at least
108 volts and does not exceed 132 volts. Refer to the
Electrical section of this manual (page 5) for proper ex-
tension cord sizing.
For replacement parts contact:
www.PartsFor.com
16