Specifications

TroubleshootingGuide

3|Page

Table1:  SPECIFICATIONS‐520(T‐H2)/320(T‐H2S)DirectVentIndoor*andOutdoor 
Model
520DirectVent
Indoor(T‐H2‐DV)
520Outdoor
(T‐H2‐OS)
320DirectVent
Indoor(T‐H2S‐DV)
320Outdoor
(T‐H2S‐OS)
Dimensions H25.6"×W18.5"×D12.4"
Weight 73lbs. 71lbs. 73lbs. 71lbs.
Combustion
INPUT
BTU/h
Max 199,000 180,000
Min 13,000
CombustionSystem Powervent
Installation Direct‐vent Outdoor Direct‐vent Outdoor
Fanmotor PWMturbofan
Manifold
Pressure**
Max
LP4.9”WC
Natural3.6”WC
LP4.6”WC
Natural2.8”WC
LP4.3”WC
Natural2.5”WC
LP3.6”WC
Natural1.9”WC
Min
LP1.0”WC
Natural0.7”WC
LP0.9”WC
Natural0.6”WC
LP1.0”WC
Natural0.7”WC
LP0.9”WC
Natural0.6”WC
Watercontrol
Flowrate 0.5GPMto9.0GPM
Availableset
temperatures
100°Fto185°F
default:120°F
Temperatureon
theunitsettings
100°F,105°F,110°F,115°F,120°F,125°F,135°F,140°F,
145°F,150°F,155°F,160°F,165°F,170°F,175°F,185°F
Bypassvalve Yes
Thermistors
4thermistors
(In,Out,Mixing,Exhaust)
3thermistors
(In,Out,Mixing)
4 thermistors
(In,Out,Mixing,Exhaust)
3thermistors
(In,Out,Mixing)
Operation
Remotecontroller
model
Part# 9007603005(TM‐RE30)
PCBmodel T‐H2(Part#319143‐126) T‐H2S(Part#319143‐196)
Indicators RedLEDonPCBduringoperation&3‐digit7‐SEGLED
Powersupply
control
Surgeabsorber&PowerON‐OFFswitch
Features
Freezeprotection CeramicheatersandAuto‐firingsystem
Self‐combustion
improvement
Air‐FuelRatioDetectionSystem
Easy‐Linksystem Yes(Upto4units) N/A
Multiple‐system N/A
*The520DirectVentIndoor(T‐H2‐DV)and320DirectVentIndoor(T‐H2S‐DV)meansthe520Indoor(T‐H2‐DV)
and320Indoor(T‐H2S‐DV)inthetext.
**Themanifoldpressuremeasurementisbasedonconditionswithoutfrontcover.