Farm Fans C-2120A, Operator'S Manual, Page: 50 / 68

48
NOTE: Make sure to install and tighten the propeller in
accordance with earlier instructions.
HEATER PARTS REMOVAL AND
INSTALLATION
Most of the heater parts can be removed by simply
identifying any attached wiring and then disconnecting
the obvious mounting parts.
The following list provides information and procedures
for some of the more important components:
1. FLAME SWITCH — For removal, disconnect the two
slip-on connectors and unscrew flame switch from its
mounting bracket. Make sure to use a wrench.
Do not
attempt to turn by twisting the terminals, as it may
ruin the switch.
For installation, finger-tighten only —
do not use a wrench.
2. GAS SOLENOID VALVE COIL — Unsnap either the
plastic cap, or the metal clip, on the gas valve and slide
the housing and coil off the valve stem and body.
Do
not energize the coil when it is removed, as the coil
may become damaged due to excessive current
flow.
3. REGULATOR AND GAS SOLENOID VALVE(S) — The
gas regulator and solenoid valve(s) are DIRECTIONAL
and must be connected as indicated by markings near
the port openings. Make sure gas is shut off and
purged from the system (including LP vaporizer) before
removing parts.
When installing a liquid gas solenoid valve on LP mod-
els, do not over-tighten the connection into the inlet
side, as the inlet orifice may become partially blocked.
4. MAIN GAS ORIFICE — With fuel shut off and gas
purged from system, proceed as follows:
Starfire Burners:
A. Disconnect gas supply line close to the fan-heater
control box and disconnect the plumbing closure plate
from side of control box.
B. Disconnect the pressure gauge line fitting from the
pipe tee.
C. Disconnect electrical connections to gas solenoid
valve(s) located within control box.
D. Lift pipe tee (with orifice, solenoid valve, and other
parts attached) straight up and remove from control
box. Orifice and other parts can now be removed from
pipe tee, if desired.
Octagonal Burners:
Disconnect the gas supply line where it connects with
the octagonal burner, loosening nearby plumbing
elbows and joints as required. Orifice is located where
gas supply line joins with octagonal burner. See Fig. 7-
8.
5. BURNER CUP — Remove the screws which secure
the cup within the venturi portion of burner weldment.
Remove burner cup, clean all parts and remove any
foreign material in venturi. Reinstall burner cup and
tighten screws.
NOTE: To aid in future removal of these parts, use
NEW stainless steel hardware during reassembly.
Apply a light coating of "anti-seize" lubricant (or equiv-
alent extreme temperature product) to screw threads.
6. REASSEMBLY — To reassemble parts, reverse the
disassembly procedure, noting the following special
points.
A. Make sure all parts are thoroughly cleaned and
free of obstruction.
B. Use a dependable brand of high temperature pipe
caulking compound when assembling gas connections.
Apply only a slight coating onto MALE threaded end of
fittings.
C. Solenoid valves and gas regulator are directional
and must be properly installed. Do not try to connect
gas solenoid valve by applying force to valve core stem
as it may ruin the unit.
D. Make sure all electrical wires are properly con-
nected. Refer to wiring diagrams for details.
E. The flame switch is a precision part. Tighten by
hand, do not use a wrench.
VAPOCT.DS4
SIDE
VIEW
GAS ORIFICE
LOCATION
Fig. 7-8 Octagonal burner orifice