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OPTIONAL CFM
This option is not available for QW241 or QW301.
These units are shipped from the factory set to operate at
the optional CFM level shown in Table 4. This provides
lower operating sound levels for non-ducted, free
discharge applications. This CFM level will reduce the
system capacity performance by approximately 2% at
the same energy efficiency.
Rated CFM is required for ducted applications for
maximum performance rating. To obtain full CFM on
these models, connect jumper wire as follows:
1. Disconnect all power to the unit. Failure to do so
may result in damage to the motor.
2. Open hinged return air grille panel
3. Open control panel cover.
4. Locate low voltage terminal strip. There is a pink
jumper wire with both ends attached to terminal
marked "G2". Move one end of this jumper to
terminal "Y".
5. Reverse steps to reassemble.
IMPORTANT INSTALLER NOTE
For improved start up performance, wash the indoor coil
with dishwashing detergent.
PHASE MONITOR
All units with three phase scroll compressors are
equipped with a three phase line monitor to prevent
compressor damage due to phase reversal.
DELAY ON MAKE TIMING
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The phase monitor in this unit is equipped with two
LEDs. If the Y signal is present at the phase monitor
and phases are correct, the green LED will light and
contactor will energize. If phases are reversed, the red
fault LED will be lit and compressor operation is
inhibited.
If a fault condition occurs, reverse two of the supply
leads to the unit. Do not reverse any of the unit factory
wires as damage may occur.
SERVICE HINTS
1. Caution user to maintain clean air filters at all times.
Also, not to needlessly close off supply air registers.
This may reduce air flow through the system which
shortens equipment service life as well as increasing
operating costs and noise levels.
2. The heat pump wall thermostats perform multiple
functions. Be sure that all function switches are
correctly set for the desired operating mode before
trying to diagnose any reported service problems.
SEQUENCE OF OPERATION
COOLING – Circuit R-Y makes the thermostat pull in
the compressor contactor starting the compressor. The
G (indoor motor) circuit is automatically completed on
any call for cooling operation, or can be energized by
manual fan switch on subbase for constant air
circulation.
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Manual 2100-419E
Page
25 of 48
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