www.desatech.com
121232-01A
8
serViCe ProCedures
Figure 5 - Removing Motor and Fan
Guard from Heater (Heater may vary
from illustration)
Screw
Screw
Motor.and.
Fan.Guard
POSSIBLE CAUSE
1..Propane. supply. may. be.
inadequate
2..High. surrounding. air. tem-
perature. causing. thermal.
limit. device. to. shut. down.
heater
3. Restricted air flow
4..Damaged.fan
5..Excessive.dust.or.debris.in.
surrounding.area
REMEDY
1. A) Refill tank
. B).Provide.additional.and/or.
larger.tanks..See.
Propane
Supply
,.page.4
2..This.can.happen.when.running.
heater.in.temperatures.above.
85°.F.(29°.C)..Run.heater.in.
cooler.temperatures
3..Check.heater.inlet.and.outlet..
Remove.any.obstructions
4..Replace. fan.. See.
Fan
,.
page.9
5..Clean.heater..See.
Mainte
-
nance
,.page.7
OBSERVED PROBLEM
Heater. shuts. down. while.
running
trouBLesHooting
Continued
WARNING: Never service
heater while it is plugged in,
connected to propane supply,
operating or hot. Severe burns
and electrical shock can occur.
MOTOR
1.. With. heater. on. its. side,. remove. access.
panel.
2.. Access.ground.screw.through.underside.
of. heater. base.. Remove. ground. screw..
Disconnect.the.green.motor.wire.and.the.
green.power.cord.wire.from.underside.of.
shell.(see.Figure.5).
3.. Remove. two. black. wires. from. motor. to.
terminal.board.
4.. Carefully.push.motor.wires.through.hole.
in.bottom.of.shell.
5.. Remove.screws.holding.motor.mount.to.
shell..Use.nut-driver.(see.Figure.5).
6.. Carefully.pull.motor.and.fan.out.of.shell..
IMPORTANT:
.Be.careful.not.to.damage.
fan..Do.not.set.motor.and.fan.down.with.
the.weight.resting.on.fan..This.could.dam-
age.fan.pitch..
7.. Use.hex.wrench.to.loosen.setscrew.which.
holds.fan.to.motor.shaft.
8.. Remove. fan.. Be. careful. not. to. damage.
the.fan.blade.pitch.
9.. Use. nut. driver. to. remove. two. nuts. that.
attach.motor.to.motor.mount.
10..Discard.old.motor.
11..Attach. motor. to. motor. mount. with. two.
nuts. Tighten nuts firmly.
12..Replace.fan.on.motor.shaft..Make.sure.
set screw contacts flat surface on motor
shaft.
13. Tighten set screw firmly (40-50 inch-
pounds.[46.08-57.60.kg-cm]).
14..Carefully.route.motor.wires.through.hole.in.
shell..Place.motor,.motor.mount..and.fan.
guard.into.rear.of.heater.shell,.as.shown.
in.Figure.5..
15..Insert. screws. through. heater. shell. and.
into motor mount. Tighten screws firmly.
16..Turn.heater.on.its.side.to.access.opening.
in.bottom.of.base..Connect.green.wires.
from.motor,.transformer..and.power.cord.
to.heater.shell.using.ground.nut.
17..Attach.two.black.wires.from.motor.to.ter-
minal.board.(see.
Wiring Diagram
,.page.
10,.for.correct.locations).
18..Replace.access.panel.
WARNING: Use
only in areas free of
high dust content.