Service Instructions; General; Safety Gas Control Valve & Burner Orifice; Thermostatic Head - L.B. White I-3 Owner's Manual And Instructions

18
I-3 Radiant Heater

Service Instructions

GENERAL

WARNING
Burn Hazard
■ Heater surfaces are extrememly hot for a period
of time after the heater has been shut down.
■ Allow the heater to cool before performing
service, maintenance, or cleaning.
■ Failure to follow this warning will result in burns
causing injury.
WARNING
Fire and Explosion Hazard
■ Do not disassemble or attempt to repair any
heater components or gas train components.
■ All component parts must be replaced if defects
are found.
■ Failure to follow this warning will result in gas
leaks leading to fire or explosions, causing
property damage, injury, or death.
1. Close the fuel supply valve to the heater before
servicing unless it is necessary to have it open for
your service procedure.
2. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened
securely.
3. After servicing, start the heater to ensure proper
operation and check for gas leaks.
4. Replace the burner orifice if it becomes plugged with
dirt. Do not use files, drills, broaches, etc. to clean the
orifice hole. Doing so will enlarge the hole, causing
combustion or ignition problems.
SAFETY GAS CONTROL VALVE & BURNER ORIFICE
1. Remove gas hose and disconnect thermocouple at
safety control valve.
2. Remove air intake retaining screw.
3. Pull gas control assembly from heater.
4. To remove orifice, use a 1/4 in. nut driver. Replace
orifice if plugged with dust.
Owner's Manual • I-3
FIG. 16
AIR INTAKE

THERMOSTATIC HEAD

The head assembly on the zone panel includes the
adjustable thermostatic head, capillary and sensor.
The Part # for the thermostatic head is 573712,
with 26 ft. capillary.
The symptom of component failure would be the
heater staying at full heat output and not respond-
ing to lower temperature setting of thermostatic
head.
1. Loosen the attachment knob located at the
thermostatic head and valve body, and discard
head. See Fig. 17.
2. Securely tighten the knob of the replacement
head to the valve body, otherwise temperature
sensing will be affected.
FIG. 17
ATTACHMENT
KNOB
SCREW
BURNER ORIFICE
THERMOSTATIC
HEAD