Service
Page 16
G
AS
V
ALVE
R
EMOVAL
1. Remove burner tray from heater as described in the
Burner Tray Removal section..
2. Disconnect pilot tubing (if removing a Millivolt valve).
3. Disconnect wires to gas valve.
4. Unscrew gas valve from manifold.
5. Reverse above procedure to reinstall.
M
AIN
B
URNER AND
O
RIFICE
R
EMOVAL
1. Remove burner tray.
2. Remove screws from rear burner hold-down bracket.
NOTE: If the heat exchanger is sooted badly, the
burner hold-down bracket and spacer can become
distorted from direct-flame impingement and this
usually necessitates replacement of these parts.
3. Lift burners from slotted spacers and slide from orifices.
Clean with a wire brush.
4. Orifices usually do not need to be replaced. To clean, run
either copper wire or wood toothpick through orifice. Do
not enlarge hole. To remove orifice, use a socket wrench
and remove from manifold. Do not overtighten when rein-
stalling.
5. Reverse above procedure to reinstall.
I
GNITER
R
EMOVAL AND
C
LEANING
(E
LECTRONIC
)
1. Disconnect high tension wire from igniter.
2. Remove (2) screws that mount the igniter to the
burner tray.
3. Remove igniter from burner tray.
4. Reverse above procedure to reinstall.
Figure 29. Direct Spark Igniter.
Spark Gap
0.15” - 0.18”
P
ILOT
R
EMOVAL AND
C
LEANING
(M
ILLIVOLT
)
Figure 30. Honeywell Millivolt Pilot.
1. Disconnect pilot tubing and wires from gas valve.
2. Remove pilot assembly from burner tray.
3. Remove pilot from bracket.
4. Remove pilot orifice and air opening (Honeywell MV unit
only), and clean with wire or small brush.
CAUTION
DO NOT ENLARGE HOLE IN PILOT ORIFICE.
5. Reverse above procedure to reinstall.
H
EAT
E
XCHANGER
R
EMOVAL
1. Shut water, gas and electricity off, close valves and
relieve pressure, then remove relief valve. Remove side
inspection panels.
2. Remove top jacket holding screws. Remove the jacket
top.
3. Remove the four (4) screws holding down the flue collec-
tor. Remove the flue collector.
4. Remove upper in/out access panel.
5. Disconnect all electrical wiring from in/out header.
6. Remove temperature sensor from in/out header.
7. Disconnect flange nuts on In/Out header.
8. Set aside heat exchanger side baffles.
9. Lift heat exchanger straight up using caution not to dam-
age refractory.
10. Reverse above procedure to reinstall.
Pilot
Thermopile
Air Opening
Orifice
Summary of Contents for 130A
Page 24: ......
