Manual Contents Page
1. Installer Read Before Proceeding . . . . . . . . . . .3
2. Homeowner Read Before Proceeding . . . . . . . .4
3. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4. How It Works . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
5. Locating Boiler . . . . . . . . . . . . . . . . . . . . . . . . .10
6. Preparing Boiler . . . . . . . . . . . . . . . . . . . . . . . .14
7. General Venting . . . . . . . . . . . . . . . . . . . . . . . . .17
8. Sidewall Direct Venting . . . . . . . . . . . . . . . . . . .24
9. Vertical Direct Venting . . . . . . . . . . . . . . . . . . .30
10. Heating System Piping . . . . . . . . . . . . . . . . . . .36
11. Domestic Water Piping . . . . . . . . . . . . . . . . . . .39
12. Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
13. Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
14. Condensate Disposal . . . . . . . . . . . . . . . . . . . .47
15. Start-Up and Checkout . . . . . . . . . . . . . . . . . .48
16. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
17. Before Leaving Jobsite . . . . . . . . . . . . . . . . . .67
18. Service and Maintenance . . . . . . . . . . . . . . . . .68
19. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . .73
20. Internal Wiring Diagrams . . . . . . . . . . . . . . . . .91
21. Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . .94
22. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Appendix
A. Combination Refrigeration/Heating System . 101
B. Water Quality and Boiler Additives . . . . . . . .102
C. Special Requirements In Massachusetts . . .103
D. Code Required Text . . . . . . . . . . . . . . . . . . . . .105
110331-07 - 8/23
• Combi Boiler/Water Heater
• Condensing
• Direct Vent
• Gas Fired
WARNING
This boiler must only be installed, serviced, or repaired by a qualified heating installer or service technician.
Improper installation, adjustment, alteration, service or maintenance can cause severe personal injury, death,
or substantial property damage. For assistance or additional information, consult a qualified installer, service
agency, or the gas supplier. Read these instructions carefully before installing.
!
Installation, Operating and Service Instructions for
TO THE INSTALLER:
Affix these instructions adjacent to boiler.
Provide model number and serial number when
seeking information and support.
TO THE HOMEOWNER:
Retain these instructions for future reference.
Contact heating installer or technician for all issues
and support.
VELOCITY LOGO CMYK COLORS
II
Models:
• PHTM2136C
• PHTM2136CB
• PHTM2200C
