Armstrong World Industries 302 Adjustments Cooling Section HWC models, # Seconds Per Revolution

INSTALLATION Magic-Pak: HW/HWC

6-14

To adjust the regulator, turn the adjusting screw on the regulator clock- wise to increase pressure and input or counterclockwise to decrease pressure and input.

For natural gas installations, check the burner rate by observing the gas meter (making sure that all other gas appliances are turned off). The test hand on the meter should be timed for at least one revolution. Note the number of seconds for one revolution.

BTU/HR	=	Cubic Feet Per Revolution	X 3600 X	Heating
INPUT		# Seconds Per Revolution		Value

Adjustments - Cooling Section (HWC models)

No adjustments are required or should be attempted regarding any of the components of the cooling chassis. The chassis should be checked to see that none of the wiring is loose or missing.

Blower

The unit contains a direct-drive, multispeed blower. The proper speeds have been preset at the factory for heating and cooling. Refer to the wiring diagram for recommended heating/cooling speeds for specific models. Direct-drive blower motors are permanently lubricated and do not require oiling.

Limit Control

A fixed-temperature limit control is provided which will shut off the gas to the main burners if the unit is overheated for any reason. The control must not be adjusted or relocated.

High Altitude Adjustments (U.S. Installa- tions)

Ratings shown on the rating plate are for elevations up to 2000 feet. For elevations above 2000 feet, ratings should be reduced at a rate of 4% for each 1000 feet above sea level. Refer to the National Fuel Gas Code Z223.1 (latest edition) for further explanation.

High Altitude Adjustments (Canadian Instal- lations)

High altitude conversions may be made by the manufacturer’s authorized representative, in accordance with the requirement of the manufacturer, provincial or territorial authorities having jurisdiction, and in accordance with the requirements of CAN/CGA B149.1 or B149.2 Installation Code. A high altitude conversion kit, available from the manufacturer and approved for this purpose, must be used (see the Accessories section beginning on page 7-15).

SRM-HW/HWC

8/99