Greenheck Fan 470656 manual Install Suction Line, Mount the Remote Sensing Bulb By Others

Note

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.

	Suction Header	Coil
Liquid Line	Distributor
	Equalizer Line
	Nozzle

Thermal

Expansion

Valve (by others)

Suction Line
Remote Sensing Bulb	Straps
	Suction Connection

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

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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.

Note

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		6 in. min.
	Drain
prevent sewer gas from		6 in. min.
being drawn into the	Trap
unit.

Important

All traps must be installed below the roof line or be otherwise protected from freezing.

Model IG / IGX Make-Up Air 21