Envision R-410A Residential Installation Manual

6
ENVISION RESIDENTIAL INSTALLATION MANUAL
Duct System
An air outlet collar is provided on vertical top air discharge units and all horizontal units to facilitate a duct connection
(verticalbottomowunitshavenocollar).Aexibleconnectorisrecommendedfordischargeandreturnairductconnec-
tionsonmetalductsystems.Uninsulatedductshouldbeinsulatedwithaminimumof1-inchductinsulation.Applicationof
the unit to uninsulated ductwork in an unconditioned space is not recommended as the unit’s performance will be adversely
affected.
If the unit is connected to existing ductwork, check the duct system to ensure that it has the capacity to accommodate
the air required for the unit application. If the duct is too small, as in the replacement of heating only systems, larger duct-
work should be installed. All existing ductwork should be checked for leaks and repaired if necessary.
 Theductsystemshouldbesizedtohandlethedesignairowquietlyandefciently.Tomaximizesoundattenuationof
theunitblower,thesupplyandreturnplenumsshouldincludeaninternalductlinerofberglassorconstructedofductboard
fortherstfewfeet.Onsystemsemployingasheetmetalductsystem,canvasconnectorsshouldbeusedbetweenthe
unitandtheductwork.Ifairnoiseorexcessiveairowisaproblem,theblowerspeedcanbechanged.
Water Piping
 Theproperwaterowmustbeprovidedtoeachunitwheneverthe
unitoperates.Toassureproperow,usepressure/temperatureports
todeterminetheowrate.Theseportsshouldbelocatedatthesupply
andreturnwaterconnectionsontheunit.Theproperowratecannot
be accurately set without measuring the water pressure drop through
the refrigerant-to-water heat exchanger.
 Allsourcewaterconnectionsoncommercialunitsarettingsthat
accept a male pipe thread (MPT). Insert the connectors by hand, then
tightenthettingwithawrenchtoprovidealeakproofjoint.Whencon-
necting to an open loop (groundwater) system, thread any copper MPT
ttingintotheconnectorandtighteninthesamemannerasdescribed
above.
All source water connections on residential units are swivel piping
ttings(seeFigure4)thataccepta1-inchmalepipethread(MPT).
The swivel connector has a rubber gasket seal similar to a rubber hose
gasket,whichwhenmatedtotheushendofany1-inchthreaded
pipe provides a leak-free seal without the need for thread sealing tape
or compound. Check to ensure that the rubber seal is in the swivel
connector prior to attempting any connection. The rubber seals are
shipped attached to the waterline. To make the connection to a ground
loopsystem,matethebrassconnector(suppliedinCK4Lconnectorkit)
against the rubber gasket in the swivel connector and thread the female
locking ring onto the pipe threads, while maintaining the brass connec-
tor in the desired direction. Tighten the connectors by hand, then gently
snugthettingwithplierstoprovidealeak-proofjoint.Whenconnectingtoanopenloop(groundwater)system,threadany
1-inchMPTtting(SCH80PVCorcopper)intotheswivelconnectorandtighteninthesamemannerasnotedabove.The
openandclosedlooppipingsystemshouldincludepressure/temperaturetapsforserviceability.
 Neveruseexiblehosessmallerthan1-inchinsidediameterontheunit.Limithoselengthto10feetperconnection.
Check carefully for water leaks.
Figure 4: Swivel Connections
(Residential Units)
Locking
Ring
Stainless
Steel
Snap Ring
Gasket
Support
Sleeve
Gasket
Material
CAUTION: Be sure to remove the shipping material from the blower discharge before con-
necting ductwork.

Envision R-410A Specifications

General

Brand	Envision
Model	R-410A
Category	Heat Pump
Language	English