Install Instructions

Contents
2│Page
NOTE
 Checktheratingplatetoensurethisproductmatchesyour
specifications.

 In accordance with ANZI Z21.10.3, CO emission does not
exceed400PPMfornormalinput.

CONTENTS
SPECIFICATIONS
520 (T‐H2) and 320(T‐H2S)models
GasInput
520
(T‐H2)
models
Natural
Min:13,000Btu/h
Max:199,000Btu/h
Propane
320
(T‐H2S)
models
Natural
Min:13,000Btu/h
Max:180,000Btu/h
Propane
GasConnection ¾”NPT
WaterConnections ¾”NPT
CondensateDrainPort
Connection
½”NPT
WaterPressure* 15‐150psi
NaturalGas
Inlet Pressure
Min.5.0”WC
Max.10.5”WC
Propane
Inlet Pressure
Min.8.0”WC
Max.14.0”WC
ManifoldPressure**

520Direct
VentIndoor
(T‐H2‐DV)
Natural:3.2”WC
Propane:5.5”WC
520Outdoor
(T‐H2‐OS)
Natural:2.7”WC
Propane:4.6”WC
320Direct
VentIndoor
(T‐H2S‐DV)
Natural:2.5”WC
Propane:4.3”WC
320Outdoor
(T‐H2S‐OS)
Natural:1.9”WC
Propane:3.6”WC
Weight
73lbs.
(DirectVentIndoormodels)
71lbs.(Outdoormodels)
Dimensions H25.6”xW18.5”xD12.4”
Ignition ElectricIgnition
Electric
Supply 120VAC/60Hz
Consumption
Operationofthe
DirectVent
Indoormodels
152W
(1.27A)
Operationofthe 
Outdoormodels 
102W
(0.85A)
Standby
8.2W
(0.07A)
Freeze‐
Protection
207W
(1.73A)

SPECIFICATIONS………………………………...
INTRODUCTION……………………………….…
SAFETYGUIDELINES…………….……………..
INSTALLATION………………………………..….
General………………………………………..…
IncludedAccessories…………………..…
Optionalitems…………………………..…..
WarningforInstallations………..….....
High‐altitudeInstallations………………
Installationforoutdoormodels……..
Installationfordirectventindoor
models……………………………………………
VentingInstructions……………………....
GasSupply/GasPipeSizing………...…
WaterConnections……………..……….…
PressureReliefValve………………………
Condensatedrain…………………………..
ElectricalConnections…………….........
RemoteControllerConnection…….…
PumpControlConnections………..……
PumpControlMode…………………….…
Easy‐LinkSystem…………………………....
APPLICATIONS...…………………………………
SpaceHeating……….………….……………
INITIALOPERATION..…………………….……


OPERATINGSAFETY……………………………
NORMALOPERATION…………………………
General………..……….………….……………
Temperaturesettings.…….…..…………
Flow……………………………………………….
FreezeProtectionSystem…….…………
MaintenanceandService………………
UnitDrainingandFilterCleaning……
TROUBLESHOOTING……..……………………
General………..……….………….……………
Errorcodes.…………………….…..…………
COMPONENTSDIAGRAM………………..…
PARTSLIST………………….………………………
OUTPUTTEMPERATURECHART……...…
LIMITEDWARRANTY…………………….……
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Themanufacturerreservestherighttodiscontinue,orchangeat
anytime,specificationsordesignswithoutnoticeandwithout
incurringobligations.
InstallationManual
Owner’sGuide
*40psioraboveisrecommendedformaximumflow.
**TheManifoldPressureisthefactorysettingandgenerally
shouldnotneedadjustment.