Reznor DV Operation Manual (for units built before August 2003) User Manual
Page 21
Form
O-DV/RDF/ADF, P/N 148385, Page 20
FIGURE 37 - Photoelectric
Smoke Detector (cover
removed), P/N 159553, used
with sampling tube, P/N 159714
FIGURE 38
- Firestat,
P/N 42782
Location: Field-mounted in the dis-
charge 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.
18. Firestat (Option
BD5)
Location: Field-mounted on the discharge ductwork so that the sensor ex-
tends 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 in the
ductwork reaches 200°F. The switch must be manually reset.
Service: Clean the external surface. Check the wiring and connections.
19. Low Temperature
Limit
(Freezestat),
Option BE2
FIGURE 39 -
P/N 126170
stallation so that the light will be activated at approximately 50% filter block-
age. 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
function 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 setscrew 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.
17. Photoelectric
Smoke Detector
(Option SA1)
16. Dirty Filter Switch
(cont'd)
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 tempera-
ture falls below the setpoint. The switch is automatic and will startup the heater
when the temperature reaches the setpoint.
Service: Clean the external surface. Check the wiring and connections.
Freezestat Controller is P/N 126170.
OPERATION/SERVICE SECTION (cont'd)