Service Procedures - DESA Heating Products BLP55VA Manual Del Propietário

OBSERVED PROBLEM
Heater shuts down while
running
WARNING: Use
only in areas free of
high dust content.
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.
8
trouBLesHooting
Continued
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

serViCe ProCedures

www.desatech.com
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
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.
Figure 5 - Removing Motor and Fan
Guard from Heater (Heater may vary
from illustration)
Motor and
Fan Guard
Screw
Screw
121231-01B