www.desatech.com
118531-01C
21
Blue
Variable
Fan Switch
Fan Switch
(N.O.)
Green
White
On
110/115
V.A.C.
Blower
Motor
Black
Off
1
2
Black
FIREPLACE INSTALLATION
Continued
3.
Place blower against lower rear wall of
firebox outer wrapper with exhaust port
directed upward and thermodisc positioned
up near the fireplace bottom. Thermodisc
must be oriented near fireplace bottom as
shown in Figure 30, page 20, in order to
sense temperature and properly operate.
Blower will be held in position against back
wall by magnets incorporated onto blower
housing (see Figure 30, page 20).
4. Be certain that all wire terminals are
securely attached to terminals on blower
motor and thermal switch and that screw
for thermodisc bracket and green ground
wire is tight.
5. Mount speed control box by placing plastic
control shaft through opening in switch
bracket (see Figure 28, page 19).
6. While supporting speed control, secure
control shaft with lock nut by pushing
and turning lock nut with pliers clockwise
until it is tight against mounting plate.
Place control knob provided on shaft
(see Figure 28, page 19).
7. Check to make sure that power cord is
completely clear of blower wheel and
that there are no other foreign objects in
blower wheel. Also double check all wire
leads and make sure wire routing is not
pinched or in a precarious position. Cor-
rect accordingly.
8. Turn on power to duplex outlet if previ
-
ously turned off per warning in column 1,
page 19.
9. Plug in blower power cord to duplex
outlet.
10. Blower will only run when speed control
knob is in the ON position and the thermal
switch senses temperature after fireplace
begins to heat up. The blower speed can
be adjusted by rotating control knob. To
turn off, turn knob fully counterclockwise
until it clicks off. If blower is ON and has
been running with fireplace operating,
blower will continue to run for a short time
after fireplace has been turned off. As
thermal switch cools down, blower shuts
down automatically.
11. Peel off backing paper and stick supplied
wiring diagram decal on firebox bottom
approximately 12" in front of blower (see
Figure 29, page 20).
WIRING DIAGRAMS
CAUTION: Label all wires
prior to disconnection when
servicing controls. Wiring errors
can cause improper and dan-
gerous operation. Verify proper
operation after servicing.
Figure 31 - Blower Wiring Diagram for
Thermostat-Controlled Models
DO NO
T
CONNECT T
O
120V
RE
D
REPLACE
FA
CT
OR
Y
WIRING WITH 105°
C
EQUI
VA
LENT
OR
HIGHER RA
TIN
G
EXTERNA
L
WIRIN
G
USE ON
LY
CLASS
2
THERMOST
AT
WIRE
18 GA. RED/WHITE
WHITE
TH/TP
TP
TH
W
A
LL
SWITC
H
THERMOPILE
PILO
T
BURNE
R
IGNIT
OR
PILO
T
GA
S
LINE
O
F F
PIL
OT
ON
PILO
T
SAFET
Y
VA
LV
E
INCOMING MAIN GA
S
SUPPL
Y
Figure 32 - Millivolt Ignition Wiring
Diagram
