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Piping
1 .
All units should be connected to supply and return
piping in a two-pipe reverse return configuration. A
reverse return system is inherently self-balancing
and requires only trim balancing where multiple
quantities of units with different flow and pressure
drop characteristics exist in the same loop. Check
for proper water balance by measuring differential
temperature reading across the water connections.
To insure proper water flow, the differential flow
should be 10°F to 14°F (5°C to 8°C) for units in
cooling mode.
A direct return system may also work acceptably,
but proper water flow balancing is more difficult to
achieve and maintain.
2 .
The piping can be steel or copper.
WARNING
Polyolester Oil, commonly known as POE oil is a synthetic oil
used in many refrigeration systems. POE oil, if ever in contact
with PVC/CPVC will coat the inside wall of PVC/CPVC pipe
causing environmental stress fractures. It is recommended
that PVC/CPVC piping is not used in the installation of the loop
system, as system failure and property damage could result.
3 .
Supply and return runouts usually join the unit via
short lengths of high pressure flexible hose which
are sound attenuators for both unit operating noise
and hydraulic pumping noise. One end of the hose
should have a swivel fitting to facilitate removal for
service. Hard piping can also be brought directly to
the unit. This option is not recommended since no
vibration or noise attenuation can be accomplished.
The hard piping must have unions to facilitate unit
removal. See
Figure 11
4 .
Some flexible hose threaded fittings are supplied
with sealant compound. If not, apply Teflon tape to
assure a tight seal.
Figure 11: Sizes 007 through 060 shown
Flex Hoses
Return Riser
Condensate Riser
Ball Valves
Supply Riser
IM 1049-9
for typical piping setup.
Electrical Access Panel
Hanger Kits (4)
Supply Air
Note: Do not over-torque fittings. The maximum torque
without damage to fittings is 30 foot pounds. If a
torque wrench is not available, use as a rule of
thumb, finger tight plus one quarter turn.
5 .
Supply and return shutoff valves are required at
each conditioner. The return valve is used for
balancing and should have a "memory stop" so that
it can always be closed off but can only be reopened
to the proper position for the flow required.
6 .
No unit should be connected to the supply and
return piping until the water system has been
cleaned and flushed completely. After the cleaning
and flushing has taken place, the initial connection
should have all valves wide open in preparation for
water system flushing.
7 .
Condensate piping can be steel, copper or PVC.
Each unit includes a condensate connection.
8 .
The condensate disposal piping must be trapped.
The piping must be pitched away from the unit
not less than 1⁄4" per foot. The unit has a 3/4 inch
female pipe fitting on each water source heat pump
to accommodate the condense drain connection.
Factory supplied condensate hose assemblies have
a pipe thread fitting to facilitate connection of a
flexible vinyl or steel braided hose.
A complete copper or PVC condense system can
be used. Union fittings in the copper or PVC lines
should be applied to facilitate removal.
Figure 12: Condensate disposal trapping detail
1-1⁄2" (38mm)
1-1⁄2"
(38mm)
9 .
Do not locate any point in the drain system above
the drain connection of any unit.
10 . Automatic flow controlled devices must not be
installed prior to system cleaning and flushing.
11 . A high point of the piping system must be vented.
12 . Check local code for the need for dielectric fittings.
12
u
i
nit
nstallation
Optional
Field- Installed Vent
1⁄4" Per Foot
(21mm Per Meter)
www.DaikinApplied.com
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