www.desatech.com
113170-01E
11
Temperature
Temperatura
Thermostat
Termostato
LO
HI
Ig
nito
r
• E
nce
nd
ed
or
All
um
eu
r
Vo
ltag
e •
Ten
sió
n •
Ten
sio
n
Fla
m
e • L
lam
a • F
lam
m
e
Sta
rt/R
un
En
cie
nd
a/O
per
ació
n
Dé
m
arr
e/M
arc
he
5
6
4
3
2
1
Upper Fuel Line
Figure 13 - Fuel Filter Removal
5. Adjust pressure. Turn relief valve to right to
increase pressure. Turn relief valve to left to
decrease pressure. See specifications below
for correct pressure (see Figure 12).
6. Remove pressure gauge. Replace pressure
gauge plug in filter end cover.
Fuel Filter,
Bushing and
Lower Fuel Line
Control Cover
Screw
SERVICE PROCEDURES
Continued
Figure 12 - Adjusting Pump Pressure
Pressure
Gauge
Pump
Model Pressure
125T
6.0 PSI
170T
6.0 PSI
200T
6.2 PSI
WARNING: HIGH VOLTAGE
WARNING: To avoid risk of burn
and electrical shock, never at-
tempt to service heater while it is
plugged in, operating or hot.
IGNITOR
1. Remove upper shell (See
Upper Shell Re-
moval
, page 10).
2. Remove fan (see page 10).
3. Remove 2 control cover screws with a phil-
lips screwdriver. Remove control cover (see
Figure 13).
4. Disconnect ignitor wires from ignition control
assembly (see Figure 14). Pull the ignitor
wires up through the hole in the lower shell.
5. Disconnect fuel line hose and air line hose.
Remove photocell from photocell bracket (see
Figure 14).
6. Remove combustion chamber. Stand com-
bustion chamber on end with nozzle adapter
bracket on top (see Figure 15, page 12).
7. Remove ignitor screw with a 1/4" nut driver
for models using ignitor HA1000 or 5/16"
nut driver for models using ignitor HA1100.
Carefully remove ignitor from nozzle adapter
bracket.
8. Carefully remove replacement ignitor from
styrofoam packing.
Tem
peratu
re
Tem
peratu
ra
Ther
mo
stat
Termo
stato
LO
HI
Ig
nitor •
En
c
en
d
e
d
o
r
A
ll
um
e
u
r
V
o
lt
a
g
e
•
T
en
s
ión
•
T
e
n
s
io
n
Fl
a
me
•
L
la
m
a
•
F
la
mm
e
S
ta
r
t/
R
u
n
E
n
c
ie
n
d
a
/O
p
e
r
ac
ió
n
D
é
m
a
r
r
e
/M
ar
c
he
5
6
4
3
2
1
11293
5-01
Figure 14 - Disconnecting Ignitor Wires
from Ignition Control Assembly
(170T Model Shown)
Combustion
Chamber
Photocell
Bracket
Air Line Hose
Fuel Line
Hose
Ignitor
Wire
Ignitor
Nozzle Adapter
Bracket
Ignition
Control
Assembly
Control Cover
Ignitor
Wire
Photocell
Assembly
FUEL FILTER
1. Unplug heater.
2. Remove control cover screws using medium
phillips screwdriver.
3. Remove control cover.
4. Pull upper fuel line off fuel filter neck (see
Figure 13).
5. Carefully pry bushing, fuel filter and lower
fuel line out of fuel tank (see Figure 13).
6. Wash fuel filter with clean fuel and replace in
tank.
7. Attach upper fuel line to fuel filter neck.
8. Replace control cover.
