26
LDAP-IOM (01-22) 207733-A
CONTROLS
NOTE: Refer to the
section for probable causes and reset instructions for
the following controls.
Locations for the following controls are shown in
.
Heat Section Pressure Switch
Venter Motor Capacitor
Fan Motor Capacitor
Adjustable Destratification
Fan Control
Manual-Reset High
Temperature Limit Control
Disconnect Switch
Transformer
Combination Gas Valve
DSI Control
(Circuit Board)
Fan Permissive
Relay
Ignitor
Heat Permissive Relay
(Models 800 and 1200)
Heat Section
Venter Motor
24 V Thermostat
Terminal Board
Destratification
Relay
Remote Destrat
Relay
Vent Permissive
Relay (Models 800
and 1200)
Auto-Reset High
Temperature Limit
Control
Terminal
Boards
Flame
Sensor
Fan
Motor
Heat Section
Flue Wrapper
Burner Orifice
Burner Assembly
Optional Relay
Figure 15. Component Locations (Typical)
Pressure Switches
⚠ DANGER ⚠
Safe operation of this unit requires proper venting flow. NEVER bypass the pressure switch or
attempt to operate the unit without the venter running and the proper flow in the vent system.
Hazardous conditions could result.
•
The heat section (combustion air proving) pressure switch (see
for location) is a pressure-sensitive
switch that monitors air pressure to ensure that proper combustion airflow is available . The switch is a single-pole/
normally-open device that closes when a differential pressure is sensed between the venter housing and the flue
collection box . Each section in the heater has a pressure switch . In addition, heaters with more than one heat
section (unit sizes 800 and 1200) have a flue collection box section pressure switch that senses the negative
pressure in the main venter housing .
