Pilot Burner Adjustment - Ducane CMP A Series Installation Instructions Manual

8. Recheck for leaks in the manual shut off valve, gas control
valve and gas connections using a soap solution.
Figure I.I 2 GAS CONTROL DIAGRAM
PRESSURE R£QULATOR
ADJUSTMENT (UNDER
INLET
PRESSURE
INLET
_ IGNITER
CONNECTOR
PRESSURE
TAP
OUTLET
WARNING
Never use an open flame when testing for gas
leaks! Use of an open flame could lead to a fire or
explosion.
OUTLET
ADJUSTMENT
IGNITION SYSTEM (UNDER
CONTROL SWITCH CONNECTOR - CAP SCREW}
WARNING
Do not attempt to manually light the pilot.
Failure to follow this warning can lead to
electrical shock that could result in bodily harm
After the ductwork connections have been made, gas piping
and electrical wiring completed and the furnace has been properly
vented, the unit should be started and adjusted for proper
operation. Check off the following steps as they are completed:
1. Be sure all electrical power is OFF.
2. Cheek all wiring using proper wiring diagram on inside of the
control box cover.
3. Turn on the electrical power.
4. Set the ignition system control switch in the "ON" position.
5. Set the thermostat above room temperature.
6. The hot-surface igniter will heat-up to an "orange" glow, and
ignite the pilot. If the flame sensor detects a proper pilot
flame, the main burners will ignite. If the main burners do not
ignite, follow step 7. Otherwise, go to step 8.
7. Adjust the pilot flame to envelop the flame sensor for a
distance of 3/8" m 1/2" (See Figure 2.12). The adjusting
screw for the pilot flame is located on the main gas control
(See Figure 1.12). It will be necessary to remove the burner
access panel to properly observe the pilot. See Instructions on
Page 16 for removal/replacement information.
Figure 2.12 PILOT BURNER ADJUSTMENT
:1./8"
MAIN BURNER FLAME
3JS" to _/2"
PILOT ADJUSTMENT
CAUTION
Many soaps used for leak testing are corrosive to
certain metals. Piping must be rinsed thoroughly
with clean water after leak check has been
completed. ,:.
9. Check the unit's input rate. When checking rate, make sure all
other gas appliances are shut OFF except for pilot burners.
Use the following formula to determine the furnace's input rate:
_eating Value Gas
(BTU/CU.
ft°}_
Input I x 7200 sec/2hr. -- time in seconds I
_ for 2 cu. ft. of gas. __
Example: If the heating value of the naturalgas is 1015 Btu/cu.
and it takes 75 seconds to burn 2 cu. ft. of gas then:
Input = 1015 Btu/cu. ft. X 7200 sec/2 hr.
75 sec/2 cu. ft.
Input 197,440 Btu/hr.
¸WARNING ;?_ _
ff it is necessary to adjust the manifold p_
more than !-0.3"w.c., then the
orifice
mu_t_
changed. Failure to follow this warning e0fild
lead to a hazardous furnace operating condition
and result in serious bodily injury or loss of life.
WARNING
Never set the furnace input rate above that shown
on the rating plate. Failure to follow this warning
could lead to premature heat exchanger failure and
a hazardous furnace operating condition and result
in serious bodily injury or loss of life.
20246506 Issue 9939 Page 12 of 22