Greenheck Fan 470658 MSX manual Install the Drain Line, Verify Coil Hand Designation

Hot Return

Connection

Entering Air

Leaving Air

Cold Supply

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.

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.

Installation of Chilled Water Coil Piping (optional)

Important

Guidelines for the installation of the cooling coil have been provided to insure proper performance of the coils and their longevity. These are general guidelines that may have to be tailored to meet the specific requirements of any one job. As always, a qualified party or individual should perform the installation and maintenance of the coil. Protective equipment such as safety glasses, steel toe boots and gloves are recommended during the installation and maintenance of the coil.

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 Drain Trap drawn into the unit.

6 in. min.

6 in. min.

When installing couplings, do not apply undue stress to the connection. Use a backup pipe wrench to avoid breaking the weld between the coil connection and the header.

All field piping must be self-supporting. System piping should be flexible enough to allow for the thermal expansion and contraction of the coil.

Important

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

1. Verify Coil Hand Designation

Check the coil hand

designation to ensure that it matches the system.

Coils are generally plumbed with the supply connection located on

the bottom of the leaving air-side of the coil and the

return connection at the top of the entering air-side of the coil. This arrangement provides a counter flow heat exchanger and positive coil drainage.

2. Check the Coil 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.

3. Connect the Supply and Return Lines

Connect the supply and return lines as shown above.

4. Install the Drain Line
Connect an unobstructed
drain line to the drain pan.
A trap should be installed		6 in. min.
to prevent sewer gas from	Drain	6 in. min.
being drawn into the unit.	Trap

Important

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

14 Model MSX Make-Up Air ®