Daikin Enfinity CCH - Water Piping Installation Requirements

unit installation
IM 1049-9 12 www.DaikinApplied.com
Piping
1. All units should be connected to supply and return
pipinginatwo-pipereversereturnconguration.A
reverse return system is inherently self-balancing
and requires only trim balancing where multiple
quantitiesofunitswithdifferentow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ow,thedifferentialow
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owbalancingismoredifcult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exiblehosewhich
are sound attenuators for both unit operating noise
and hydraulic pumping noise. One end of the hose
shouldhaveaswiveltting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 for typical piping setup.
4. Someexiblehosethreadedttingsaresupplied
withsealantcompound.Ifnot,applyTeontapeto
assure a tight seal.
Figure 11: Sizes 007 through 060 shown
Ball Valves
Supply Riser
Return Riser
Condensate Riser
Supply Air
Hanger Kits (4)
Flex Hoses
Electrical Access Panel
Note: Do not over-torque ttings. The maximum torque
without damage to ttings is 30 foot pounds. If a
torque wrench is not available, use as a rule of
thumb, nger 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owrequired.
6. No unit should be connected to the supply and
return piping until the water system has been
cleanedandushedcompletely.Afterthecleaning
andushinghastakenplace,theinitialconnection
should have all valves wide open in preparation for
watersystemushing.
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ttingoneachwatersourceheatpump
to accommodate the condense drain connection.
Factory supplied condensate hose assemblies have
apipethreadttingtofacilitateconnectionofa
exiblevinylorsteelbraidedhose.
A complete copper or PVC condense system can
beused.UnionttingsinthecopperorPVClines
should be applied to facilitate removal.
Figure 12: Condensate disposal trapping detail
Optional
Field- Installed Vent
1-1⁄2"
(38mm)
1-1⁄2"(38mm)
1⁄4"PerFoot
(21mm Per Meter)
9. Do not locate any point in the drain system above
the drain connection of any unit.
10. Automaticowcontrolleddevicesmustnotbe
installedpriortosystemcleaningandushing.
11. A high point of the piping system must be vented.
12. Checklocalcodefortheneedfordielectricttings.