Johnson-controls AFFINITY 340968-XIM-A-0108 User Manual download pdf (Page 17)

340968-XIM-A-0108

Johnson Controls Unitary Products 17

To adjust the pilot flame:

1. Remove the pilot adjustment cover screw.

2. Adjust the pilot adjustment screw to achieve the proper

pilot flame.

3. Replace the pilot adjustment cover screw after the pilot

flame is set.

To remove the pilot assembly:

1. Disconnect the wiring from the control board to the pilot

assembly.

2. Remove the two (2) #8 screws holding the pilot assem-

bly in place.

3. Remove the pilot assembly.

ADJUSTMENT OF TEMPERATURE RISE

The temperature rise (or temperature difference between the

return air and the heated air from the furnace) must lie within

the range shown on the rating plate and the data in Tables 3

and 4.

After the temperature rise has been determined, the CFM can

be calculated as follows:

After about 20 minutes of operation, determine the furnace

temperature rise. Take readings of both the return air and the

heated air in the ducts about six feet from the furnace where

they will not be affected by radiant heat. Increase the blower

CFM to decrease the temperature rise; decrease the blower

CFM to increase the rise.

DIRECT DRIVE BLOWER

All units have direct drive multi-speed blower motors. Refer to

the unit wiring diagram and connect the blower motor for the

desired motor speed.

CHECKING GAS INPUT

NATURAL GAS

1. Turn off all other gas appliances connected to the gas

meter.

2. With the furnace turned on, measure the time needed for

one revolution of the hand on the smallest dial on the

meter. A typical gas meter usually has a 1/2 or a 1 cubic

foot test dial.

3. Using the number of seconds for each revolution and the

size of the test dial increment, find the cubic feet of gas

consumed per hour from Table 12.

If the actual input is not within 5% of the furnace rating with

allowance being made for the permissible range of the regu-

lator setting, replace the orifice spuds with spuds of the

proper size.

NOTE: To find the BTU input, multiply the number of cubic

feet of gas consumed per hour by the BTU content

of the gas in your particular locality. (Contact your

gas company for this information since it varies

widely from city to city.)

FIGURE 12 - PROPER FLAME ADJUSTMENT

Pilot

Spark Ignitor

Flame Senso

min.

Degrees F Temp Rise

BTUH Output

1.08 CFM×

------------------------------------

CFM

BTUH Output

1.08 Degrees F Temp Rise×

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