Amana PGB**C Installation Instructions Manual Download Page 14

14

Check The Manifold Pressure
A tapped opening is provided in the gas valve to facili-
tate measurement of the manifold pressure. A “U” Tube
manometer having a scale range from 0 to 12 inches of
water should be used for this measurement. The mani-
fold pressure must be measured with the burners oper-
ating.

To adjust the pressure regulator, remove the adjust-
ment screw or cover on the gas valve. Turn out (coun-
terclockwise) to decrease pressure, turn in (clockwise)
to increase pressure. Only small variations in gas flow
should be made by means of the pressure regulator
adjustment. In no case should the final manifold pres-
sure vary more than plus or minus 0.3 inches water
column from the specified pressure. Any major changes
in flow should be made by changing the size of the
burner orifices.

Check The Gas Input (Natural Gas Only)
NOTE:  
On outdoor equipment, the gas input will vary
with the temperature of the gas. Rated input will be
obtained at approximately 10° F. With warmer ambient
and gas temperatures, the input will decrease. Ex-
ample:
 At 70° F the input will decrease 12%.

To measure the gas input using the gas meter proceed
as follows:

1. Turn off gas supply to all other appliances except

the unit.

2. With the unit operating, time the smallest dial on the

meter for one complete revolution. If this is a 2
cubic foot dial, divide the seconds by 2; if it is a 1
cubic foot dial, use the seconds as is. This gives the
seconds per cubic foot of gas being delivered to the
unit.

3. INPUT=GAS HTG VALUE x 3600 / SEC. PER

CUBIC FOOT

Example: Natural gas with a heating value of 1000 BTU
per cubic foot and 34 seconds per cubic foot as deter-
mined by Step 2, then:

Input = 1000 x 3600 / 0.34 = 106,000 BTU per Hour.
NOTE: BTU content of the gas should be obtained
from the gas supplier. This measured input must
not be greater than shown on the unit rating plate.

4. Relight all other appliances turned off in step 1. Be

sure all pilot burners are operating.

Check Main Burner Flame
Flames should be stable, soft and blue (dust may cause
orange tips but they must not be yellow) and extending
directly outward from the burner without curling, floating
or lifting off.

Check Temperature Rise
Check the temperature rise through the unit by placing
thermometers in supply and return air registers as close
to the unit as possible. Thermometers must not be able
to sample temperature directly from the unit heat ex-
changers, or false readings could be obtained.

1. All registers must be open; all duct dampers must

be in their final (fully or partially open) position and
the unit operated for 15 minutes before taking read-
ings.

2. The temperature rise must be within the range

specified on the rating plate.

NOTE: Air temperature rise is the temperature differ-
ence between supply and return air.

With a properly designed system, the proper amount of
temperature rise will normally be obtained when the unit
is operated at rated input with the recommended blower
speed.

If the correct amount of temperature rise is not ob-
tained, it may  be necessary to change the blower
speed. A higher blower speed will lower the tempera-
ture rise. A slower blower speed will increase the tem-
perature rise.

NOTE: Blower speed MUST be set to give the correct
air temperature rise through the unit as marked on the
rating plate.

Checking External Static Pressure
The total external static pressure must be checked on
this unit to determine if the airflow is proper.

Summary of Contents for PGB**C

Page 1: ...afety practices follow them The precautions listed in this Installation Manual should not supersede existing practices but should be considered as supplemental information ATTENTION INSTALLING PERSONN...

Page 2: ...shut off turn off the manual gas control valve to the unit before shut ting off the electrical supply WARNING To prevent death personal injury or prop erty damage do not use this unit if any part of t...

Page 3: ...rn air entering the unit must be between 50 F and 100 F Provisions must be made for adequate combustion and ventilation air in accordance with Section 5 3 Air for Combustion and Ventilation of the Nat...

Page 4: ...ht bill or indemnity in lieu thereof c Original invoice or certified copy thereof showing trade and other discounts or reductions d Copy of the inspection report issued by carrier representative at th...

Page 5: ...propane gas and for altitude adjust ments Piping IMPORTANT NOTE To avoid possible unsatisfactory operation or equipment damage due to under firing of equipment do not undersize the natural propane ga...

Page 6: ...ring which may result in heat failure This unit and its shut off valve must be disconnected from the gas supply dur ing any pressure testing of that system at test pressures in excess of 1 2 PSIG 3 48...

Page 7: ...er gas pressure depends on three main factors 1 Vaporization rate which depends on a tempera ture of the liquid and b wetted surface area of the container or containers 2 Proper pressure regulation 3...

Page 8: ...re 5 V Electrical Wiring Locating The Thermostat Thermostat should be mounted 5 feet above the floor on a vibration free inside wall in a room or a hallway that has good air circulation Movement of ai...

Page 9: ...sformer primary lead and induced draft blower mo tor leads as shown on the unit wiring diagram Heat Anticipator Setting The heat anticipator in the room thermostat must be correctly adjusted to obtain...

Page 10: ...duct should be provided with an access panel This access should be large enough to inspect the air chamber downstream from the heat exchanger for any smoke or combustion gas leaks A cover should be ti...

Page 11: ...ocated and other spaces of the building Turn on clothes dryers and any appliance not connected to the common venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so they w...

Page 12: ...ll Out Protector Figure 9 Rollout Protection IX Heating Sequence of Operations Normal Sequence of Operation Heating 1 Thermostat calls for heat The combustion blower is immediately energized 2 The pre...

Page 13: ...Figure 12 With Power And Gas On 2 Put unit into heating cycle and turn on all other gas consuming appliances Figure 12 Measuring Inlet Gas Pressure Alternate Method Secondary Limit Control On the PGB...

Page 14: ...per cubic foot as deter mined by Step 2 then Input 1000 x 3600 0 34 106 000 BTU per Hour NOTE BTU content of the gas should be obtained from the gas supplier This measured input must not be greater t...

Page 15: ...ishing phases of construction on a new struc ture This type of use may result in pre mature failure of the unit due to extremely low return air temperatures and expo sure to very dirty atmospheres To...

Page 16: ...d with water thoroughly dried and sprayed with a filter adhesive before being reinstalled Filter adhesives may be found at many hardware stores Permanent filters should last several years However shou...

Page 17: ...sonal injury due to electrical shock do not remove any in ternal compartment covers or attempt any adjustment Contact a qualified ser vicer at once if an abnormal flame ap pearance should develop At l...

Page 18: ...ng Flame Roll Out Switch Blower Motor Gas Orifice Blower Wheel Heat Exchanger Burner High Limit Switch Compressor Secondary Limit Condenser Coil Ignitor Flame Sensor Condenser Fan Blade Induced Draft...

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