Greenheck Fan 470656 Verify Coil Hand Designation, Check the Coil for Leaks, Mount Pressure Tap

Entering Air

Hot Return

Connection

Cold Supply Connection

Leaving Air

Installation of Chilled Water Coil Piping (optional)

Important

Guidelines for the installation of the cooling coil have been provided to ensure 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.

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.

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 & 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.

22Model IG / IGX Make-Up Air

Installation of Building Pressure Control (optional)

1. Mount Pressure Tap

Using the factory provided bracket, mount the pressure tap to the

outside of the unit. Choose a location out of the prevailing winds and away from supply or exhaust fans to assure accurate readings.

2. Run Pressure Tap Lines

Run a pressure tap line from the pressure tap on the outside of the unit to the low pressure tap on the back of the photohelic gauge. Run a second pressure tap line from the high pressure tap on the back of the photohelic gauge to the space. Fifty feet of tubing is supplied with the unit.

Factory	High
Wiring	Pressure
	Tap to
	space

Low

Pressure

Tap to

outside

Connections for Photohelic Gauge

3. Set the Building Pressure

The pressure gauge is used to set the desired building pressure. The pressure is set by adjusting the knobs for the upper and lower pressure limits. Typical settings are 0.0 in. wg for the lower and 0.10 in. wg for the upper pressure setting.

Pressure Indicating	Pressure Setting
Needle	Needles

Pressure Setting Knobs

Typical Photohelic Gauge Settings

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