Bard QC501 Manuel D’Utilisation
Manual 2100-416
Page 21
Page 21
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Maximum ESP (inches WC) shown is with 1” thick disposable filter (reduced by .2 for 2” filter).
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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 “Y”.
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 “Y”.
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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.
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.
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Continuous fan CFM is the total air being circulated during continuous fan mode.
OPTIONAL CFM
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.
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:
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 terminal
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.
coil with dishwashing detergent.
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.
This may reduce air flow 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.
the desired operating mode before trying to
diagnose any reported service problems.
SEQUENCE OF OPERATION
FIRST STAGE COOLING
– Circuit R-Y makes the
thermostat open the first stage cooling water valve.
SECOND STAGE COOLING
– Circuit R-Y2 make
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.
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 blow off or re-evaporated as it
passes down over the dry portion of the
coil.
the second state were energized alone, the
condensate from the upper part of the coil
could be blow 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.
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.
last 5 KW of heat.
START UP
TABLE 5
INDOOR BLOWER PERFORMANCE
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
and cooling, dry and wet coil conditions, and at both 230/208
or 460 volts.
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