McQuay IM 900
5
Installation
Installation
Mounting
All McQuay water and glycol coils are designed to be fully
drainable when properly mounted. Vertical air-flow is not
recommended for dehumidifying coils.
Figure 2: Coil Mounts
Installation
If you are unsure about any portion of the installation, contact
your local steam specialist for assistance
.
1
Carefully remove the coil from the shipping package to
avoid damage to the finned surface area. Damaged fins can
be straightened using an appropriate fin comb.
2
McQuay recommends cleaning the coil with a
commercially available coil cleaner prior to installation.
Refer to “Maintenance” on page 5 for cleaning
recommendations.
3
Check the coil hand designation to insure that it matches
the system. Water and glycol 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
(Figure 2) provides counter flow heat exchange and
positive coil drainage. If a universal coil is supplied, cap off
the two unused connections.
Figure 3: Supply and Return Locations
4
Standard coils must be mounted level to insure proper
drainage. Refer to “Mounting” on page 4 for leveling
requirements.
5
Proper clearance should be maintained between the coil
and other structures such as the fan, filter racks, transition
areas, etc.
6
Once installed, the coil should be pressurized 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 more than likely one or more small leaks which
should be located and repaired. Pressure losses greater than
5 psig would indicate a larger leak that should be isolated
and repaired. If the coil itself is found to be leaking, contact
your local McQuay sales representative.
Note:
Unauthorized repair to the coil may void the coil's
warranty (see McQuay’s warranty policy on back
cover).
7
All field brazing and welding should be performed using
high quality materials and an inert gas purge (like nitrogen)
to reduce oxidation of the internal surface of the coil.
8
All field piping must be self-supporting. System piping
should be flexible enough to allow for thermal expansion
and contraction of the coil. Typical piping diagrams are
represented in Figure 4 and Figure 5.
Figure 4: Horizontal Air Flow
Figure 5: Vertical Air Flow
CAUTION
Sharp edges on sheet metal and fasteners can cause
personal injury.
This equipment must be installed, operated,
and serviced only by an experienced installation company and
fully trained personnel.
Protective equipment such as safety glasses, steel toe boots
and gloves are recommended during the installation and
routine maintenance of the coil.
CAUTION
Failure to properly install the coil can result in irreparable
damage to the coil as well as other components in the system.
Supply
Gate
Valve
Return
Side Vent
Plug
Air Vent
Side Drain Plug
Air Flow
Union
Drain Valve
Cap
Dirt Leg
Tee
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