Installation
28│Page
• Inordertopurgeairinwaterpipeswithinaclosed‐loopsystem,anairvent
andairseparatorshouldbeins talledintothesystem.Requiredcirculation
flow rates are labeled next to each application diagram.These flow rate
requirementsmustbefollowed.
• Toxicchemicalsusedinboiler
treatmentssuchasalcohol,glycerolandglycol
groupsmustnotbeintroducedintothesystemif thesystemincorporatesan
open‐looppotablewatersystem.
• Thewaterheatercanbeusedtosupplypotablewaterandspaceheatingand
shall not be connected to any heating system or component(s)
previously
usedwithnon‐potablewaterwhereanychemicalswereaddedtothewater
heatingappliances.
• When the system requires water for space heating at temperatures higher
than required for other uses, a means such as a mixing valve shall be
installed to temper the water for those other uses
in order to reduce scald
hazardpotential.
• Water temperature over 125 °F (52°C) can cause severe burns instantly or
deathfromscalds.
• ChemicalssuchasdilutedGlycolcanbeusedforradiantfloor,Hydro/fancoil
air or Baseboard heating only. The diluted solution of glycol must contain
between
25and55 %ofGlycol.Beawarethatinclosed‐loopglycolsystems,
low pressure in the heat exchanger can cause low‐temperatu r e boiling,
resulting in excessive noise and damage to the water heater. Consult with
theglycolmakerforspecificationspriortouse.
Thisisaconceptdrawingonly.
APPLICATIONS
‐Space‐HeatingApplications‐
*Therecirculationpumpistobecontrolledby:
‐Dual‐setaquastat(recommendedw/timer)
OR
‐“PumpControlMode”(T‐D2Modelsonly).
Refertop.23.
*Therecirculationpumpistoprovidenoless
than2GPMandnomorethan4GPMthrough
eachactivatedunitinthe
system.
‐Recirculation‐
WARNING
Checkvalve
Checkvalve
Air
se
arator
Recirculation
um
Hotwateroutletto
fixtures
AirVent
Unions
Gassupply
Ballvalves
Expansiontank
Y‐Strainer
Coldwater
inlet
Hot
Water
Outlet
S
Cold
Water
Inlet
Gas
Inlet
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