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schematic. The wires running to the condensing unit can
be sourced from either the indoor unit's terminal block, or
the thermostat.
NOTE: If a two stage auxiliary electric heater kit is
installed, only stage one will operate during defrost mode.
To activate both auxiliary heating stages during defrost
mode, add an 18 AWG jumper wire connecting W1 and W2
on the indoor unit's terminal block.
TERMINAL BLOCK - INDOOR UNIT
S1
S2
R
C
G
W1 W2
Y1
Y2
O
R
C
G
W1 W2
Y1
Y2
O
THERMOSTAT
System Start Up
Never operate the compressor with the suction valve
closed to test the compressor's pumping efficiency. In
some cases, this can result in serious compressor damage
and loss of warranty coverage.
For the 7-1/2 ton unit starting charge should be 18 lbs.
of R-410A and 20 lbs. for the 10 ton unit. The length of
line set, indoor unit airflow, condensing unit location and
number of tubing fittings will have an impact on final unit
charge amount. Turn the electrical power on, and let the
system run. Wait for the refrigerant pressures to stabilize.
NOTE: The unit comes with a holding charge of 55 oz.
Charge Verification
REFRIGERANT UNDER PRESSURE!
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative
pressure.
Failure to follow proper procedures may cause property
damage, personal injury or death.
Use refrigerant certified to AHRI standards. Used
refrigerant may cause compressor damage. Most portable
machines cannot clean used refrigerant to meet AHRI
standards.
NOTICE: Violation of EPA regulations may result in fines or
other penalties.
T1 T2
T3
T4
T5
RED
BLUE
WHITE
YELLOW
PURPLE
ORANGE
CONDENSER - TWO STAGE HP
WARNING
CAUTION
Damage to the unit caused by operating the compressor
with the suction valve closed is not covered under the
warranty and may cause serious compressor damage.
Final Charge Adjustment
The outdoor temperature must be 60°F or higher. Set the
room thermostat to COOL, fan switch to AUTO, and set the
temperature control well below room temperature.
After system has stabilized per startup instructions, check
subcooling and superheat as detailed in the following
section.
Expansion Valve System
R
C
NOTE: The expansion valve bulb must be in place on the
W1
suction line and insulated.
Y1
Y2
Expansion Valve Indoor Coils:
O
Outdoor Temperature Over 60ºF. When the outdoor
temperature is above 60ºF, charge the system with the
room thermostat set in the "Cooling" mode and the fan
operating in the "Auto" position.
Outdoor Temperature Below 60ºF. When the outdoor
temperature is below 60ºF, charge the system with the
room thermostat set in the "Heat" mode and the fan
operating in the "Auto" position.
System Charging Cooling Mode. At stabilized cooling
conditions and with an outdoor temperature of 60°F
or higher, the system should have from 9°F to 13°F
subcooling. For a proper subcooling reading, measure
the refrigerant pressure and temperature at the outdoor
unit's liquid line service valve. If you have less than 9°F
subcooling, add charge. If you have more than 13°F
subcooling, remove charge.
NOTE: Wait at least 10 minutes before taking readings and
making further adjustments for the system to stabilize.
While reaching the proper subcooling level it is important
to know the discharge line temperature. This temperature
should be at least 80ºF over ambient or unit is flooding
back to compressor.
System Charging Heating Mode. Measure the hot gas
discharge at the compressor to check the system charge in
heat mode.
1. Allow the system to operate for at least 20 minutes.
2. Attach and insulate an electronic thermometer to
the hot gas discharge line mid way between the
compressor and the reversing valve. NOTE: The
thermometer is to be well insulated to prevent ambient
influences.
7
CAUTION
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