506488-01
Page 11
Issue 1008
x
3600 x
= Cubic Feet Per Revolution
BTU/HR
INPUT
# Seconds Per Revolution
Heating
Value
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.
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. In the
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, and should require no
adjustments when properly installed. If however unit
performance is questioned, perform the following
checks.
OPERATION
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.
Suction Superheat
Table 3
Series
Suction Superheat
+/-3 Deg°F @ ARI
Conditions 82° OD,
80° IDDB/67° IDWB
4PGE13
Size
24
17
Liquid Line Subcooling
+/-2 Deg°F @ ARI
Conditions 82° OD,
80° IDDB/67° IDWB
-
30
36
42
48
60
24,30
36
42
48
60
4PGE15
15
19
13
18
15
-
-
-
-
-
12
15
10
7
8
-
-
-
-
-
