Hubbell MSH Water Heater User Manual


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9
Model MSH & MH
Shipboard Electric
Water Heater
9
Optional Steam Package
Steam Component General Conguration
Thesteamcontrolvalvemaintainsaccuratewater
temperatureinasteamredwaterheaterbyregulating
theowofsteamthroughtheheatingcoil.
There are four types of steam control valves available for
use on a steam red storage water heater.
Pilot Operated
Apilotoperatedcontrolvalveisthemostwidelyused
typeofvalveforstandardwaterheatingapplications.
Inthistypeofvalve,atemperaturepilotdeviceutilizes
steamtooperatethemainvalve.Noexternalpower
sourceisrequiredotherthansteam.Thisisahighly
dependabletemperaturecontrolsystemwhichissuitable
formostapplications.Asanoption,thisvalvemay
includeapressurereducingpilotwhichlimitsthesteam
pressuretoapredeterminedmaximum.
Electronic Operated
Thiscontrolvalveissimilartoapneumaticallyoperated
system,exceptinthiscasethetemperaturecontrolleris
asophisticateddigitaldisplayelectronicdevicewhich
outputsa4-20masignaltoacompactmotormounted
onthesteamcontrolvalveinordertoproportionally
controltheowofsteamtotheheatingcoil.The
temperaturecontrollerdisplayssetpointaswellas
actualwatertemperatureandisavailablewithanRS485
communicationsportforremotecontrol.
Self Operating
Thevalvedesignincludesabulbandcapillaryassembly
chargedwithathermallyresponsivevapor.The
expansion/contractionofthevaporactsuponthevalve
bellowsinordertocontroltheowofsteamthrough
thevalve.Noexternalpowersourceisrequiredfor
operation.
Pneumatically Operated
Inthiscongurationtheshipsairsupplyfeedsafactory
installedtemperaturecontrollerwhichoperatesthe
steamcontrolvalve.Thetemperaturecontrollersends
apreciseairsignaltothesteamcontrolvalvewhich
adjuststheowofsteamintotheheatingcoil.The
temperaturecontrollerisfullyadjustablefrom50-250°F
andrequires20psiairatamaximumconsumptionof0.5
SCFM.
Steam Inlet
Y Strainer
Condensate Outlet
Steam
Control
Valve
Adjustable
Temperature Pilot
To sensing bulb
in tank
Thermostatic
Drip Trap
Steam Pressure Gauge
Pneumatic or electronic
controller (if required)
Vacuum Breaker
Steam Coil
Y Strainer
F & T Main
Condensate Trap
Model MSH & MH
Shipboard Electric
Water Heater
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