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Optional CFM
These units are shipped from the factory set to operate
at the optional CFM level shown in Table 6. 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. Add pink jumper wire (provided) to terminals 5 and
6 on the terminal board.
5. Reverse steps to reassemble.
Important Installer Note
For improved start up performance, wash the indoor
coil with dishwashing detergent.
Service Hints
1. Caution user to maintain clean air filters at all
times and to not close off supply air registers
needlessly. This may reduce airflow through the
system, which shortens equipment service life as
well as increasing operating costs and noise levels.
2. The wall thermostat 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.
RATED
MODEL
ESP
QC501
0.0
NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjusts itself to
maintain approximately the same rate of indoor air flow in both heating and cooling, dry and wet coil
conditions, and at both 230/208 or 460 volts.
Maximum ESP (" WC) shown is with 1" thick disposable filter (reduced by .2 for 2" filter).
Rated CFM for ducted applications – required for maximum performance rating. To obtain full CFM, locate low
voltage terminal strip in the circuit breaker box. There is a pink jumper wire with both ends attached to terminal
marked "G2". Move one end of the jumper to terminal "Y1".
Optional CFM – the unit is shipped from the factory set to operate at the optional CFM level shown. This provides lower
operating sound levels for non-ducted, free discharge applications . This reduces system capacity performance by
approximately 2% at the same energy efficiency.
Continuous fan CFM is the total air being circulated during continuous fan mode.
TABLE 6
Indoor Blower Performance
MAX. ESP
RATED CFM
0.8
1200
Sequence of Operation
First Stage Cooling – Circuit R-Y1 makes the
thermostat open the first stage cooling water valve.
Second Stage Cooling – Circuit R-Y2 makes the
thermostat open the second stage cooling water valve.
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.
CAUTION: Second stage cooling must always be
energized in conjunction with first stage. If
the second state were energized alone, the
condensate from the upper part of the coil
could be blown off or re-evaporated as it
passes down over the dry portion of the coil.
Heating – A thermostat demand for heating makes
R-W1 circuit as well as R-G circuit. This starts the
indoor blower as well as turns on the electric heater.
Second Stage Heating (15 KW only) – Circuit R-W2
energizes the second contactor and brings on the last 5
KW of heat.
CONTINUOUS
OPTIONAL CFM
1000
START UP
CFM @ MAX.
CFM
ESP
1000
1175
Manual
2100-416L
Page
25 of 29
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