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105339
PROPANE CONSTRUCTION HEATER
SERVICE
PROCEDURES
WARNING: Never service
heater while it is plugged in, con-
nected to propane supply, oper-
ating, or hot. Severe burns and
electrical shock can occur.
You can also visit DESA International’s
Technical Service web site at
www.desatech.com.
ELECTRICAL SYSTEM
The entire electrical system for this heater is
contained within the motor. If any part of the
electrical system is damaged, you must re-
place motor.
MOTOR
1. Remove three screws that attach fan
guard to heater shell.
2. Remove motor and fan guard from
heater shell (see Figure 10).
3. Use hex wrench to loosen set screw
which holds fan to motor shaft (see Fig-
ure 11). Remove fan. Be careful not to
damage the fan blade pitch.
4. Remove two nuts and two screws that
attach fan guard to motor using nut-
driver. Remove fan guard from motor
(see Figure 12).
5. Disconnect the green power cord wire
from motor and remove black and
white wire terminals.
6. Discard old motor.
7. Attach green power cord wire to motor.
8. Attach fan guard to new motor with two
nuts and two screws.
9. Replace black and white terminals.
10. Place fan onto motor shaft of new mo-
tor. Make sure set screw contacts flat
surface on motor shaft. Tighten set
screw firmly (40-50 inch-pounds).
11. Place motor and fan guard into rear of
heater shell. Make sure power cord is
properly located (see Figure 13).
12. Insert three screws through heater shell
and into fan guard. Tighten screws
firmly.
Figure 10 - Removing Motor and Fan Guard from Heater
Figure 11 - Setscrew Location
Figure 12 - Removing or Attaching Fan
Guard from Motor
Setscrew
Figure 13 - Replacing Motor and Fan Guard into Heater