Service manual

1
2
3
4
CS
R
R
BL
BL
91 TO L2
90 TO L1
5
6
PE
COIL
2
CCoommmmeerrcciiaall HHVVAACC
&&
RR DDiivviissiioonn ••
Modine Manufacturing Company • 1500 DeKoven Avenue • Racine, Wisconsin 53403-2552
Phone: [phone] (HEAT) • Fax: [phone] • www.modine.com
© Modine Manufacturing Company 2002 1/02 - 1M Litho in USA
TTYYPPIICCAALL PPOOWWEERR EEXXHHAAUUSSTT WWIIRRIINNGG -- DDFFGG,, IIFFGG,, DDBBGG,, IIBBGG,, DDCCGG,, IICCGG
FFiigguurree 88..11
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4
3
2
1
R
R
BL
BL
TO L2
TO L1
CS
PE
COIL
H T G
TO LIMIT
CONTROL
R WIRE
FFiigguurree 88..22
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IIMMPPOORRTTAANNTT::
After installing the power exhaust and adapter kit, as per instructions on front cover, and wiring the power venter per
Figure 8.1 or 8.2 for DFG/IFG duct furnace and system units, use the following check-out procedure to check final
installation.
1. If the unit has a standing pilot, turn on the gas supply only
and light the pilot according to the instructions on the unit’s
serial plate, then proceed with Step 2. If the unit is equipped
with an intermittent pilot ignition system, turn on the gas
supply to unit and proceed with Step 2.
2. Turn on power supply to unit. Nothing should happen.
3. Turn up the thermostat to call for heat. The power exhaust
motor should start, the centrifugal switch of the power
exhaust should close, and the main burner should light.
After a delay of approximately 30 seconds, the fan motor
should start.
4. Turn the thermostat down again. The main burner and
power exhaust motor should shut off.
5. Check the power exhaust centrifugal switch for proper
function. To do this, remove the centrifugal switch lead on
limit control (R) or terminal “6”. Turn up the thermostat to
call for heat. The power exhaust motor should run, but the
main burner should not light. After a 30 second delay, the
fan motor should operate. The main burner should still not
light.
6. Turn down the thermostat and allow the power exhaust
motor and fan motor to stop running. Reconnect the
centrifugal switch lead to limit control (R) or terminal “6”.
Recycle the unit as described in Steps 3 and 4.
WWIIRRIINNGG LLEEGGEENNDD
LINE LOW
FACTORY
FIELD
WIRE NUT
CChheecckk--OOuutt PPrroocceedduurree
POWER
EXHAUST
MOTOR
POWER
EXHAUST
MOTOR
WWIIRRIINNGG LLEEGGEENNDD
LINE LOW
FACTORY
FIELD
WIRE NUT