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TABLE OF CONTENTS
2
RECEIVING EQUIPMENT ........................................ 3
MODEL IDENTIFICATION ........................... 3
GENERAL SPECIFICATIONS ....................... 3
GENERAL SAFETY PRECAUTIONS .............. 4
INSTALLATION INSTRUCTIONS .............................. 5
CLEARANCES .......................................... 6
SPECIFICATIONS AND DIMENSIONS ........... 7
OUTDOOR INSTALLATIONS ....................... 10
HIGH WIND CONDITIONS ........................... 10
COMBUSTION AIR .................................... 10
VENTING ................................................. 11
VENT PIPING ............................................ 14
VENT DAMPER INSTALLATION ................... 15
PLUMBING ........................................................... 17
GAS SUPPLY CONNECTIONS ..................... 17
GAS PRESSURE REGULATOR .................... 18
VENTING OF DIAPHRAGM GAS
COMPONENTS ......................................... 18
FLOW RATES ........................................... 19
UNITEMP 80 SPECIFICATIONS ................... 20
PIPING DIAGRAMS ................................................ 21
TYPE WH UNITEMP 80 ............................... 21
TYPE NH INSTANTANEOUS ........................ 22
TYPE NH DUAL MODELS ............................ 23
CONTROLS ........................................................... 24
RELIEF VALVE .......................................... 24
ECONOMASTER CONTROL ........................ 24
ELECTRONIC IGNITION ............................. 24
OPERATING CONTROLS ............................ 24
LIMIT CONTROLS .................................................. 25
HIGH LIMIT ............................................... 25
FLOW SWITCH ......................................... 25
100% PILOT SAFETY ................................. 25
LOW WATER CUT-OFF .............................. 25
HIGH AND LOW GAS PRESSURE SWITCHES 25
COMPONENT IDENTIFICATION ............................... 26
ELECTRICAL CONNECTIONS .................................. 27
LOCATION OF CONTROLS ..................................... 28
START-UP PROCEDURES ...................................... 30
GENERAL ................................................ 30
PUMP AND MOTOR ................................... 30
GENERAL SAFETY PRECAUTIONS .............. 31
LIGHTING INSTRUCTIONS ......................... 32
AFTER START-UP ..................................... 33
INSPECTION PROCEDURES ................................... 33
BURNERS ................................................ 33
CONTROLS .............................................. 33
INSPECTION PROCEDURES ....................... 34
ADDENDA: LOW NOx HEATERS 181-401 .................. 35
TROUBLESHOOTING ELECTRICAL ......................... 37
WIRING DIAGRAMS ............................................... 38
WH2 - 182-260 .......................................... 38
WH2 - 330-400 .......................................... 39
WH2 - 514-624 .......................................... 40
WH2 - 724-1336 ......................................... 41
WH2 - 1414-1826 ....................................... 42
WH2 - 2100-2500 ....................................... 43
WH2 - 3001-4001 ....................................... 44
WH1 - 181-261 LOW NOx ............................ 45
WH1 - 331-401 LOW NOx ............................ 46
TROUBLESHOOTING MECHANICAL ........................ 47
TROUBLESHOOTING PUMPS .................................. 48
SERVICE AND MAINTENANCE PROCEDURES ........... 48
TUBE CLEANING ...................................... 48
BURNER TRAY REMOVAL .......................... 49
GAS VALVE REMOVAL ............................... 49
MAIN BURNER AND ORIFICE REMOVAL ...... 49
PILOT REMOVAL AND CLEANING ................ 49
HIGH LIMIT OR TANKSTAT REMOVAL .......... 49
HEAT EXHANGER REMOVAL ...................... 49
COMBUSTION CHAMBER REMOVAL ........... 50
CONTROL WELL REPLACEMENT ................ 50
TUBE REPLACEMENT ............................... 50
CLEANING FLUE GAS PASSAGEWAYS ........ 51
REPLACEMENT PARTS .......................................... 51
WARRANTY .......................................................... 52