Allied Air 4PGE Руководство по установке и обслуживанию - Страница 11

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For Natural Gas: Check the gas input rate by observing

the gas meter, when available, making sure 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

INPUT

# Seconds Per Revolution

The heating value of the gas can be obtained from the local

utility company.

For Propane Gas: The only check for the gas input rate is to

properly adjust the manifold pressure using a manometer.

Typical manifold set point for installations at altitudes from 0 to

4500 feet above sea level is 10.0" W.C.

Temperature Rise

Check the temperature rise and, if necessary, adjust blower

speed to maintain temperature rise within the range shown

on the unit rating plate.

High Altitude

Ratings are shown on the rating plate for elevations up to

4500 feet. For elevations above 4500 feet, ratings should

be reduced at a rate of 4% for each 1000 feet above sea

level. See the National Fuel Gas Code Z223.1 (latest edition)

or the Canadian Installation Codes CAN/CGA-B149.1 &

B149.2 for further details.

Secure Owner's Approval

When the system is functioning properly, secure the owner's

approval. Show the owner the location of all disconnect

switches and the thermostat. Instruct the owner on how to

start and stop the unit and how to adjust temperature settings

within the limitations of the system.

506488-01

Heating

x 3600 x

Value

Issue 1008

OPERATION

Cooling System

The cooling system is a complete factory package

utilizing an air-cooled condenser. The compressor is

hermetically sealed and base mounted with rubber-

insulated hold-down bolts.

Unit compressors have internal protection.

event there is an abnormal rise in the temperature of

the compressor, the protector will open and cause the

compressor to stop.

Cooling Sequence of Operation

When the thermostat calls for cooling, R is closed to G

and Y (see the wiring diagrams beginning on page 15).

This action completes the low voltage control circuit,

energizing the compressor, condenser fan motor, and

blower motor.

Blower Delay – Cooling

The circulating air blower is controlled by a timing

circuit in the integrated blower/ignition control.

Timings are not adjustable. Blower "on" delay is 5

seconds after the compressor starts and blower "off"

timing is 90 seconds after the cooling system shuts

d o w n .

System Performance

This equipment is a self contained, factory optimized

refrigerant

system,

adjustments when properly installed. If however unit

performance is questioned, perform the following

checks.

Suction Superheat

+/-3 Deg°F @ ARI

Series

Size

Conditions 82° OD,

80° IDDB/67° IDWB

4PGE13

24,30

4PGE15

and

should

require

Liquid Line Subcooling

+/-2 Deg°F @ ARI

Conditions 82° OD,

80° IDDB/67° IDWB

Table 3

In the

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