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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 must be used
to overcome the internal
negative pressure in the unit
and allow the water to drain
while the unit is operating.
IMPORTANT
All traps must be installed below the roof line or be
otherwise protected from freezing.
12
Model IG / IGX Make-Up Air
Hot Return
Connection
Entering
Leaving
Air
Air
Cold Supply
Connection
6 in. min.
Drain
6 in. min.
Trap
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. To ensure
accurate reading,
choose a location
out of the prevailing
winds and away from
supply or exhaust
fans.
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 that the unit is sensing. Fifty feet of
tubing is supplied with the unit.
3. Set the Building Pressure
Factory
Wiring
Low
Pressure
Tap to
outside
Connections for Photohelic Gauge
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
Needle
Pressure Setting Knobs
Typical Photohelic Gauge Settings
High
Pressure
Tap to
space
Pressure Setting
Needles
®
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