Greenheck IG Installation, Operation And Maintenance Manual page 21

If a hot gas bypass kit was provided by others, refer
to the manufacturer's instructions.
3. Install Suction Line
Install suction line(s) from the compressor to the
suction connection(s) which are stubbed through the
side of the cabinet.
4. Install the Liquid Line and Thermal
Expansion Valve (TEV) (By Others)
Liquid line openings vary by coil size and
circuiting and are field-supplied. Follow the TEV
recommendations for installation to avoid damaging
the valve. If the valve is externally equalized, use
a tubing cutter to cut off the plugged end of the
factory-installed equalizer line. Use a de-burring tool
to remove any loose metal from the equalizer line and
attach it to the TEV. If the valve is internally equalized,
the factory-installed equalizer line can be left as is.
Liquid Line
Equalizer Line
Nozzle
Thermal
Expansion
Valve (by others)
Suction Line
Straps
Remote Sensing Bulb
General Installation
5. Mount the Remote Sensing Bulb
(By Others)
The expansion valve's remote sensing bulb should be
securely strapped to the horizontal run of the suction
line at the 3 or 9 o'clock position and insulated.
6. Check Coil Piping for Leaks
Pressurize the coil to 100 psig with dry nitrogen or
other suitable gas. The coil should be left pressurized
for a minimum of 10 minutes. If the coil holds the
pressure, the hook-up can be considered leak free.
If the pressure drops by 5 psig or less, re-pressurize
the coil and wait another 10 minutes. If the pressure
drops again, there is likely one or more small leaks
which should be located and repaired. Pressure losses
greater than 5 psig indicate a large leak that should be
isolated and repaired.
7. Evacuate and Charge the Coil
Use a vacuum pump to evacuate the coil and any
interconnecting piping that has been open to the
atmosphere. Measure the vacuum in the piping using
a micron gauge located as far from the pump as
possible. Evacuate the coil to 500 microns or less
and then close the valve between the pump and the
system. If the vacuum holds to 500 microns or less
®
NOTE
Coil
Suction Header
Distributor
Suction Connection
for one minute, the system is ready to be charged or
refrigerant in another portion of the system can be
opened to the coil. A steady rise in microns would
indicate that moisture is still present and that the coil
should be further vacuumed until the moisture has
been removed.
Failure to obtain a high vacuum indicates a great
deal of moisture or a small leak. Break the vacuum
with a charge of dry nitrogen or other suitable
gas and recheck for leaks. If no leaks are found,
continue vacuuming the coil until the desired
vacuum is reached.
8. Install the Drain Line
Connect an
unobstructed drain
line to the drain pan. A
trap should be used to
prevent sewer gas from
being drawn into the
unit.
IMPORTANT
All traps must be installed below the roof line or be
otherwise protected from freezing.
NOTE
Drain
6 in. min.
Trap
Model IG / IGX Make-Up Air
6 in. min.
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