McQuay FCVC, Installation And Maintenance Manual

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8 McQuay IM 980-1
Installation
11 Do not connect a unit to the supply and return piping
until the water system has been cleaned and flushed
completely. After this is done, the initial connection
should have all valves wide open in preparation for water
system flushing.
12 Condensate piping can be steel, copper, or PVC. A
means of disconnection must be furnished to facilitate
fan section removal.
13 No point of the drain system may be above the drain pan
of any unit.
14 Automatic flow control devices must not be installed
prior to system cleaning and flushing.
15 Check local code for any requirement for electrical
fittings.
Connecting to a Factory-Installed Valve &
Piping Package
To view connection locations for factory-installed valve &
piping packages, see
Figure 34, page 25 . Before installing
supply and return lines to a factory piping package, review the
following items.
• All piping connections are 5/8" O.D.S. (1/2" nominal)
female copper connections.
• Supply and return piping should not interfere with the
secondary drain pan or condensate line.
• The installer must provide adequate piping system filtration
and water treatment.
• McQuay Deluxe and Enhanced piping packages include a
strainer which prevents debris from entering the coil. Clean
the strainer regularly.
• The fan coil ships with brackets to adequately support the
piping package during shipment. Remove these brackets
before connecting water piping to the unit.
• Set end valves to the fully open position to prevent damage
to the valve seat during brazing.
• Remove the secondary drain pan, if in place, to prevent
exposure to dripping solder or excessive temperatures.
• Solder water piping connections to supply and return end
connections. Avoid overheating factory soldered joints to
prevent the possibility of leakage.
• Insulate fan coil piping to secondary drain pan connections
and any piping that is not above the secondary drain pan.
Field-Installed Valve & Piping
Review General Guidelines‚ page 7 before beginning. Then
carry out the following steps to install valves and piping.
1 For units equipped with a secondary coil make sure that
an air vent is included in the return line piping (see
Figure 8 ). Primary coils are factory-equipped with vents
for venting the system, but secondary coils (preheat or
reheat) are not.
Figure 8: Secondary Coil Air Vent
2
Remove the secondary drain pan, if in place, to prevent
exposure to dripping solder or excessive temperatures.
Note: Factory-installed valve and piping packages include
the secondary drain pan, which ships with the unit.
For other arrangements, the secondary drain pan
must be ordered separately.
3
Push the main drain pan condensate hose back inside the
end plate to prevent it from getting burned when making
sweat connections. Be sure to pull the hoses back
through and route to the secondary drain pan when the
end panel has cooled.
4
Slide ½" copper tubing or connection couplings (installer
provided) onto the coil connections. Solder the joint
using a good-quality, lead-free solder to provide a
watertight connection.
5 After connections are complete, insulate all piping to the
coil connections as necessary to prevent condensate from
dripping outside of the secondary drain pan.
6 Install the optional secondary drain pan.
Shutoff/Balancing Valve
Each fan coil should be at least be equipped with shutoff
valves on both the supply and return lines for easy
serviceability and removal if it becomes necessary. We suggest
using our combination shutoff/balancing valves between the
IMPORTANT
Venting is required on the return piping for secondary preheat
or reheat coils. It is included on factory-built piping packages,
but must be added by the installing contractor for field-installed
piping. See
Figure 8 .
WARNING
Avoid overheating when soldering field connections to the coil
to prevent leakage, overheating of the copper tubes, and
melting of valves, factory-soldered joints or component
gasketing. A quenching cloth is recommended. See
Figure 7 .
Secondary
Coil Air
Vent