102777-YIM-E-0206
114 Unitary Products Group
NOTES:
For On/Off functions, 1 is ON and 0 is OFF
Read only items are readings from sensors which only change as the measured condition changes.
SERVICE
REFRIGERATION SYSTEM
CHARGE: Each system is fully factory charged with R-22.
The correct charge appears on the unit nameplate.
Thermal Expansion Valves: The 30 ton unit has 3 and the 40
ton unit has 4 independent refrigeration systems. These
TXVs are set to maintain 15°F superheat leaving the evapo-
rator coil. The superheat on each valve is adjustable, how-
ever, adjustments should only be made if absolutely
necessary.
MOISTURE/LIQUID SIGHT GLASS: Each system has a
moisture/liquid sight glass. These are located on the liquid
lines in the condenser section.
A clear flow of liquid indicates the unit is properly charged.
Any bubbles indicates the system is undercharged or non-
condensables may exist. Corrective action should be taken.
A change in color of the moisture indicator shows the approx-
imate moisture content of the system in parts per million. If
moisture is indicated, corrective action should be taken.
FILTER DRIER: Each system is equipped with a filter drier.
The drier should be replaced whenever moisture is indicated
in the system.
COMPRESSORS
Each compressor is inherently protected from over current
and over temperature. High and low pressure switches are
installed on the discharge and suction lines respectively for
high and low pressure protection. Scroll compressors operate
in only one direction. If the compressor is experiencing low
amperage draw, similar discharge and suction pressure or
increased noise level, it is operating in reverse. Switch two
line voltage connections to correct (See Compressor Rotation
page 63).
MOTORS
INDOOR BLOWER MOTORS
All indoor blower motors are non-inherently protected three
phase motors. Overcurrent protection is provided by a man-
ual reset starter/overload relay and short circuit protection is
provided by fuses.
POWER EXHAUST OR RETURN AIR FAN MOTORS
All motors are non-inherently protected three phase motors.
Overcurrent protection is provided by a manual reset
starter/overload relay and short circuit protection is provided
by fuses.
CONDENSER FAN MOTORS
All condenser fan motors are inherently protected three
phase motors. Short circuit protection is provided by fuses.
DRAFT MOTOR (GAS FURNACE)
All draft motors are line voltage, inherently protected, single
phase PSC motors. Short circuit protection is provided by
fuses.
79 Hot Gas Bypass ON-OFF ON-OFF OFF
80 Compressors Number 2 to 4 Factory Set
81 Heat Stages Number 0 to 3 Factory Set
82 Duct Static Reading Inches Water 0 to 5.0” Read Only
83 Building Pressure Reading Inches Water 0 to 5.0” Read Only
84 Low Ambient Kit Installed ON-OFF ON-OFF Factory Set
85
Building Static Pressure Sensor
Enable
ON-OFF ON-OFF Factory Set
86 ERV Installed ON-OFF ON-OFF Factory Set
87 ERV Unoccupied Fan ON-OFF ON-OFF Factory Set
88 Duct Static Shutdown Setpoint Inches Water 0 to 5.0” 4.5”
TABLE 52: SETTABLE SYSTEM PARAMETERS (Continued)
ADDRESS FUNCTION UNIT RANGE DEFAULT YOUR SETTINGS
TABLE 53: SYSTEM MOISTURE INDICATOR
INDICATOR
COLOR
75° 100° 125°
Green (Dry) Below 30 Below 45 Below 60
Chartreuse 30 - 90 45 - 130 60 - 180
Yellow (Wet) Above 90 Above 130 Above 180
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