ForNaturalGas:Checkthegasinputratebyobserving
thegasmeter,whenavailable,makingsureallothergas
appliancesareturnedoff.Thetesthandonthemeter
shouldbetimedforatleastonerevolution.Notethe
numberofsecondsforonerevolution.
BTU/HR= Cubic Feet Per Revolution x 3600 x Heating
INPUT # Seconds Per Revolution Value
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 installationsat 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.
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. 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 found on pages 15 and 16). 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 down.
System Performance
For maximum performance of the cooling system, operat-
ing temperatures and pressure should be checked.
Superheat should be determined at Standard ARI test
conditions of 82°F outdoor and 80°F indoor dry bulb/67°F
wet bulb. If superheat measured deviates from values
found in Table 3, refrigerant charge should be adjusted
accordingly for maximum performance.
Suction Superheat
24 22°
PGE13
SG13 30, 36, 42, 20°
48, 60
24, 30 15°
PGE15
SG15
" 481 60 10°
Table 3
# 48111B005 Page 11
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