Reznor LDAP Unit Installation Manual - Manual (Page 40)

Form I-LDAP, P/N 207733R6, Page 40
10.1.9. Combustion
Air Pressure
Switch(es)
See FIGURE 22, page 35, for location of the heat sec-
tion pressure switch. If it is determined that a pressure
switch needs replacing, use only the factory-authorized
replacement part that is designed for the model and size
of heater being serviced.
Size 400 has one pressure switch; Size 800 has two
heat section pressure switches and a main combustion
air pressure switch; and Size 1200 has three heat sec-
tion pressure switches and a main combustion air pres-
sure switch. The main combustion air pressure switch is
located on the top of the first heat section (see the illustra-
tion in Paragraph 10.1.6, page 38).
Main
Combustion
Air Pressure
Switch -
Models 800
and 1200
Heat
Section
Pressure
Switch
2) With the manual valve turned off to prevent flow to the gas valve, connect
a manometer to the 1/8” outlet pressure tap in the valve. NOTE: A
manometer (fluid-filled gauge) is recommended.
3) Turn the manual valve to the ON position and the heater OFF. Use your
finger to fully block the main burner orifice for several seconds. Observe
the manometer with the orifice blocked, and if any pressure is indicated,
the gas valve is leaking. A leaking gas valve must be replaced before
the heater is placed back in operation.
NOTE: A heater operating above 6000 ft elevation requires high altitude heat
section pressure switch(es). See Paragraph 5.
10.1.12 Transformer See FIGURE 22, page 35, for location. Use a voltmeter to
verify that there are 24 volts output from the transformer. If
the transformer is not functioning, it must be replaced. Use
a replacement transformer identical to the factory-installed
model.
10.1.11 High Limit
Control
A manual reset high limit control is located at the top of each
heat section. Do not reset high limit control without correct-
ing the problem. If it is determined that the limit control needs
replacing, use only a factory-authorized replacement part that
is designed for the size of heater.
10.1.14 Vent System Check the complete vent system at least once a year. Inspection should
include all joints, seams, and the vent terminal cap. Clean openings. Replace
any defective parts.
10.1.13 Adjustable
Fan Control
See FIGURE 22, page 35, for location. Check the wiring connec-
tions and the adjustment knob.
If it is determined that the destratification fan control needs
replacing, use only a factory-authorized replacement part that is
designed for the heater.
10.1.10 Limit Control If it is determined that the automatic reset limit control needs
replacing, use only a factory-authorized replacement part that
is designed for the size of heater.
For approximate limit location, see
FIGURE 22, page 35.
10.0 Maintenance
and Service
(cont’d)
10.1.8 Operating Gas Valve(s) (cont’d)
10.1 Maintenance
Procedures
(cont’d)