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SYSTEM OPERATION
Model
Minimum Recommended Filter Size^
*MVC960403BN*
1 - 16 X 25 Side or Bottom
*MVC960603BN*
1 - 16 X 25 Side or Bottom
*MVC960803BN*
1 - 16 X 25 Side or Bottom
*MVC960804CN*
1 - 16 X 25 Side or Bottom
*MVC961005CN*
1 - 20 X 25 Bottom / 2 - 16 X 25 Side Return
*MVC961005DN*
1 - 20 X 25 Bottom / 2 - 16 X 25 Side Return
*MVC961205DN*
1 - 20 X 25 Bottom / 2 - 16 X 25 Side Return
*CVC960403BN*
2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC960603BN*
2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC960804CN*
2 - 10 X 20 or 1 - 16 X 25 Top Return
*CVC961005CN*
2 - 14 X 20 or 1 - 20 X 25 Top Return
*CVC961205DN*
2 - 14 X 20 or 1 - 20 X 25 Top Return
^
Larger filters may be used, filters may also be centrally located
The following figure shows possible filter locations.
CENTRAL
RETURN
GRILLE
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
Possible Upright Upflow
FILTER
ACCESS
DOOR
RETURN
DUCT
FILTER
SUPPORT
BRACKET
(Field Supplied)
AIR FLOW
Figure 44
CENTRAL
RETURN
GRILLE
AIR FLOW
Possible Upright
Counterflow
Filter Locations
Figure 45
HORIZONTAL INSTALLATIONS
Filters must be installed in either the central return register
or in the return air duct work.
STARTUP PROCEDURE & ADJUSTMENT
Furnace must have a 115 VAC power supply properly con-
nected and grounded. Proper polarity must be maintained
for correct operation. In addition to the following start-up and
adjustment items, refer to further information in Operational
Checks section.
DRAIN TRAP PRIMING
The drain trap MUST be primed prior to furnace startup. To
prime, fill both sides of the drain trap with water. This ensures
proper furnace drainage upon startup and prohibits the pos-
sibility of flue gases escaping through the drain system.
FURNACE OPERATION
Purge gas lines of air prior to startup. Be sure not purge lines
into an enclosed burner compartment. Follow NFPA 54, Na-
tional Fuel Gas Code for proper purging methods. In Canada,
follow approved purging methods in CAN/CSA B149.1-15.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved method. Verify that all required kits (propane
gas, high altitude, etc.) have been appropriately installed.
FURNACE STARTUP
1. Close the manual gas shutoff valve external to the furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner
by hand.
5. Move the furnace gas valve manual control to the OFF
position.
6. Wait five minutes then smell for gas. Be sure check near
the floor as some types of gas are heavier than air.
7. If you smell gas after five minutes, immediately follow
the safety instructions in the Safety Considerations on
page 3 of this manual. If you do not smell gas after five
minutes, move the furnace gas valve manual control to
the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shutoff valve external to the furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room temperature.
12. After the burners are lit, set the thermostat to desired
temperature.
FURNACE SHUTDOWN
1. Set the thermostat to the lowest setting.
The integrated control will close the gas valve and extin-
guish flame. Following a 15 second delay, the induced
draft blower will be de-energized. After the blower off
delay time expires, the blower de-energizes.
43
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