User Guide

Part number 550-142-055/0411
GV90+ gas-fired water boiler — User’s Information Manual
12
Operating instructions
Before attempting to start the boiler, check the boiler pressure temperature gauge.Ifboilerandsystemarefull
ofwaterandproperlypressurized,thegaugeshouldreadatleast12psigonmostsystems.Operatingtheboilerwithout
properwatercontentwilldamageboilerandcontrolsandcouldresultinseverepersonalinjury,deathorsubstantial
property damage.
Figure 5 Operating instructions