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USING THIS MANUAL 1
A. INSTALLATION SEQUENCE . . . . . . . . . . . . .1
B. SPECIAL ATTENTION BOXES . . . . . . . . . . . .1
1. PREINSTALLATION 2
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
B. CODES & REGULATIONS . . . . . . . . . . . . . . .2
C. ACCESSIBILITY CLEARANCES . . . . . . . . . . .2
D. COMBUSTION AND VENTILATION AIR . . . .2
E. PLANNING THE LAYOUT . . . . . . . . . . . . . . . .2
2. BOILER SET-UP 4
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
B. WALL HUNG BOILERS . . . . . . . . . . . . . . . . . .4
C. FLOOR MOUNTED BOILERS . . . . . . . . . . . . .4
3. WATER PIPING AND CONTROLS 5
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
B. OPERATING PARAMETERS . . . . . . . . . . . . . .5
C. SYSTEM COMPONENTS . . . . . . . . . . . . . . . .5
D. SYSTEM PIPING . . . . . . . . . . . . . . . . . . . . . . .8
E. FREEZE PROTECTION . . . . . . . . . . . . . . . . . .8
F. SPECIAL APPLICATIONS . . . . . . . . . . . . . . .14
4. GAS PIPING 16
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . .16
B. FUEL LINE SIZING . . . . . . . . . . . . . . . . . . . .16
C. GAS SUPPLY PIPING INSTALLATION . . . . .16
D. GAS SUPPLY PIPING – OPERATION . . . . . .17
E. MAIN GAS VALVE – OPERATION . . . . . . . .18
5. VENTING, INLET AIR & CONDENSATE 19
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . .19
B. APPROVED MATERIALS FOR EXHAUST
VENT AND INLET AIR PIPE . . . . . . . . . . . . .19
C. EXHAUST VENT / AIR INLET PIPE
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . .19
D. EXHAUST VENT AND INLET AIR PIPE
SIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
E. EXHAUST VENT AND AIR INLET PIPE
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . .21
F. EXHAUST TAPPING FOR VENT
SAMPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
G. CONDENSATE DRAIN INSTALLATION . . . .25
H. BOILER REMOVAL FROM COMMON
VENTING SYSTEM . . . . . . . . . . . . . . . . . . .25
6. ELECTRICAL 26
A. WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
B. SEQUENCE OF OPERATION . . . . . . . . . . . .26
C. SAFETY INTERLOCKS . . . . . . . . . . . . . . . . .28
D. CONTROL FUNCTIONS . . . . . . . . . . . . . . . .28
7. START-UP PROCEDURES 30
A. COMPLETING THE INSTALLATION . . . . . . .30
B. LIGHTING/OPERATING INSTRUCTIONS . . .31
C. CHECK-OUT PROCEDURE . . . . . . . . . . . . . .32
8. TROUBLESHOOTING 33
A. SHUT-DOWN . . . . . . . . . . . . . . . . . . . . . . . .33
B. BOILER FAULT CODES . . . . . . . . . . . . . . . .33
9. MAINTENANCE 35
A. GENERAL (WITH BOILER IN USE) . . . . . . .35
B. WEEKLY (WITH BOILER IN USE) . . . . . . . . .35
C. ANNUALLY (BEFORE START OF
HEATING SEASON) . . . . . . . . . . . . . . . . . . .35
10. BOILER DIMENSIONS & RATINGS 36
A. BOILER DIMENSIONS . . . . . . . . . . . . . . . . .36
11. REPAIR PARTS 39
APPENDIX A. WHAT’S NEW WITH THE
P125 CONTROL BOARD 41
A. ADVANTAGES OF THE P125
CONTROL BOARD . . . . . . . . . . . . . . . . . . . .41
B. P125 CONTROL BOARD QUICK
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . .41
C. P125 CONTROL BOARD VS. WHA
CONTROL BOARD COMPARISON . . . . . . .42
TABLE OF CONTENTS
TABLE OF CONTENTS