Reznor ADFH Operation Manual - Manual (Page 17)

Form O-ADF/RDF, P/N 148385R2, Page 17
FIGURE 35 -
Door Switch,
P/N 124253
Door Switch (Option BX1)
Location: The control is installed on an overhead door opening to control the opera-
tion of the heater to coincide with the opening and closing of the door.
Function: The function of the switch is to energize and interlock the heating unit when
an outside overhead door reaches approximately 80% of full open travel. The switch
will de-energize the furnace when the overhead door closes approximately 20%. The
complete switch includes a limit switch electrically wired to the heater and a roller yoke
for mechanical activation by a field-supplied trigger on the overhead door.
FIGURE 36 - Dirty Filter
Pressure Switch,
P/N 105507
Dirty Filter Switch (component of Remote Console Option RC14)
Location: Switch is located in the main electrical box (See FIGURE 9); sensor tubes
run to either side of the filter rack; indicator light is on the remote console.
Function: The dirty filter switch is a pressure switch that activates an indicator light
on the remote console when the filters need cleaned or replaced (See Paragraph
2.3.2). This switch is only on systems with an optional console that includes a dirty filter
light. The pressure switch is set during installation so that the light will be activated at
approximately 50% filter blockage. Contacts should close at .17 to 5.0" w.c. ± .05" w.c.
Service: Clean the sensor tubes. If the dirty filter indicator system still does not func-
tion properly, check the setting of the switch. With clean filters in place, blower doors
closed, and blower in operation, decrease the pressure setting by adjusting the set-
screw on the switch clockwise until the filter light is energized or screw is bottomed out.
At that point, adjust the setscrew three full turns counterclockwise or until the screw is
top ended.
If it is determined that the switch needs replacing, use an identical switch. When a new
switch is installed, it must be manually set; follow the instructions above.
Firestat (Option BD2 or BD4)
Location: Firestat in Option BD2 is factory-mounted in the unit. Firestat in Option BD4
is field-mounted on the return air ductwork with the sensor extending into the duct.
This control requires manual reset so it should be mounted in an accessible location.
Function: The firestat will shut down the system if the temperature at the sensor
reaches 200°F. The switch must be manually reset.
Service: Clean the external surface. Check the wiring and connections.
FIGURE 37 -
Firestat,
P/N 42782
FIGURE 38 -
Photoelectric Smoke
Detector (cover
removed), P/N 159553,
used with sampling
tube, P/N 159714
FIGURE 39 - P/N 126170
Photoelectric Smoke Detector (Option SA1)
Location: Field-mounted in the discharge ductwork.
Function: The detector will shut down the system if
smoke is detected in the discharge ductwork.
Service: Clean the external surface. Check the wiring
and connections.
Low Temperature Limit (Freezestat), Option BE2
Location: The control is in the blower section electrical box; the sensing bulb is field-
mounted in the discharge duct.
Function: The freezestat will shut down the system if the discharge temperature falls
below the setpoint. The switch is automatic and will startup the heater when the tem-
perature reaches the setpoint.
Service: Clean the external surface. Check the wiring and connections. Freezestat
Controller is P/N 126170.