Modine Manufacturing DJE Installation And Service Manual page 9

O O P P E E R R A A T T I I O O N N
! CAUTION
Start-up and adjustment procedures must be performed by a
qualified serviceman.
Gas pressure to unit heater controls must never exceed 14"
W.C. When air pressure testing piping systems for leaks, be
sure that test pressure does not exceed 14" W.C. if duct
furnaces are already installed.
Check the gas supply pressure at the unit upstream from the
pressure regulator. For the purpose of input adjustment, the
minimum supply pressure should be 6" W.C. on natural gas
or 11" W.C. on propane. The maximum inlet pressure on
natural gas should be 7" W.C. and 14" W.C. on propane.
The pilot flame must be adjusted as described below. Supply
pressure with any gas must never exceed 14" W.C.; if so,
install an additional pressure regulator upstream of the
combination gas valve. Purging of air from gas lines, piping,
and lighting the pilot should be performed as described in
ANSI Z223.1-Latest Edition "National Fuel Gas Code"
(CAN/CGA-B149 in Canada).
Be sure no obstructions block draft diverter or air intake and
discharge of unit heater.
F F i i g g u u r r e e 7 7 – – D D u u c c t t F F u u r r n n a a c c e e C C u u t t a a w w a a y y
ALUMINIZED
STEEL CASING
LIMIT
CONTROL
SENSING BULB
(ON DISCHARGE
AIR SIDE)
BURNER
ACCESS
PANEL
BURNER ASSEMBLY
DRAIN PAN
P P r r i i o o r r t t o o O O p p e e r r a a t t i i o o n n
Although this unit has been assembled and fire-tested at the
factory, the following pre-operational procedures should be
performed to assure proper on-site operation. For systems
other than standing pilot, see separate literature shipped with
unit:
1. Ensure that the electricity supply is off.
2. Check burner(s) to insure proper alignment.
3. With manual main valve turned to off, check thermostat,
4. Turn on manual valve and light pilot. If air purging is
5. Check limit control. With blower motor disconnected turn
6. Check gas input rate, as described on next page, to assure
7. Check gas piping for leaks with a soap bubble solution to
L L i i g g h h t t i i n n g g I I n n s s t t r r u u c c t t i i o o n n s s ( ( A A l l s s o o o o n n U U n n i i t t ) )
F F o o r r U U n n i i t t w w / / S S t t a a n n d d i i n n g g P P i i l l o o t t
1. Turn off power. Turn thermostat down. Close manual main
2. Open manual pilot valve. Depress safety reset while lighting
3. Open manual main gas valve. Turn on power. Set
DRAFT DIVERTER
F F o o r r U U n n i i t t w w / / I I n n t t e e r r m m i i t t t t e e n n t t P P i i l l o o t t
1. Turn off power. Turn thermostat down. Close manual main
MOUNTING HOLES (4)
2. Open all gas valves. Turn on power.
ALUMINIZED STEEL
HEAT EXCHANGER
3. Set thermostat at desired setting. (Pilot and main burner
AIR DISTRIBUTI0N
BAFFLE (ON INLET
AIR SIDE)
S S h h u u t t D D o o w w n n I I n n s s t t r r u u c c t t i i o o n n s s
LIMIT CONTROL
CAPILLARY TUBE
Turn off power and close all gas valves.
RUBBER GROMMET
A A f f t t e e r r I I n n i i t t i i a a l l S S t t a a r r t t U U p p
LIMIT CONTROL
1. Check pilot flame adjustment as shown below.
PRIMARY
AIR CONTROL
2. Check gas piping for leaks with a soap bubble solution to
MANIFOLD
COMBINATION
GAS CONTROL
3. Check gas input rate, as described on next page, to assure
SERIAL PLATE,
LIGHTING INSTRUCTION
(LOCATED ON
SIDE PANEL) P P i i l l o o t t F F l l a a m m e e A A d d j j u u s s t t m m e e n n t t
The pilot is orificed to burn properly with an inlet pressure of
6"-7" W.C. on natural gas and 11"-14" W.C. on propane gas,
but final adjustment must be made after installation. Adjust to
have a soft steady flame 3/4" to 1" long and encompassing
3/8" - 1/2" of the tip of the thermocouple or flame sensing rod.
Normally this flame will produce satisfactory results. To adjust
flame use pilot adjustment screw on combination gas control
(for location, see the combination gas control literature
supplied with unit). If the pilot flame is longer and larger than
shown by Figure 10, it is possible that it may cause soot
and/or impinge on the heat exchanger causing burnout. If the
pilot flame is shorter than shown it may cause poor ignition
and result in the controls not opening the combination gas
control. A short flame can be caused by a dirty pilot orifice.
Pilot flame condition should be observed periodically to assure
trouble-free operation.
and gas valve. If these do not function, recheck wiring with
diagram.
required, disconnect pilot at outlet valve. In no case should
line be purged into heat exchanger.
the thermostat up to call for heat. The main burner should
light. If the limit control is properly wired the main burner
will shut-off within 2 or 3 minutes. If the main burner does
not shut off within this time, turn off the gas and recheck
wiring. If the limit control functions properly, reconnect
motor and proceed with step 6 and 7.
adequate gas volume and pressure.
insure safe operation.
gas valve and wait 5 minutes.
and hold for 1 minute.
thermostat at desired setting.
gas valves and wait 5 minutes.
will light automatically when thermostat calls for heat).
insure safe operation.
adequate gas volume and pressure.
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