CWH companion water heater — Product Manual
Contents
WM97+ Boiler with Companion Water Heater (CWH) 3
WM97+ Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Companion Water Heater (CWH) . . . . . . . . . . . . . . . . . 3
Please read before proceeding 4
When servicing water heater . . . . . . . . . . . . . . . . . . . . 4
Operating restrictions . . . . . . . . . . . . . . . . . . . . . . . . 4
Boiler water restrictions . . . . . . . . . . . . . . . . . . . . . . . 4
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pre-installation 5
Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CSA Low Lead Content Only certification . . . . . . . . . . . . . 5
Code restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Clearances and placement. . . . . . . . . . . . . . . . . . . . . . 5
Domestic water piping requirements. . . . . . . . . . . . . . . . 6
Water heater operating restrictions. . . . . . . . . . . . . . . . . 6
Boiler water restrictions . . . . . . . . . . . . . . . . . . . . . . . 6
Adjusting leveling legs . . . . . . . . . . . . . . . . . . . . . . . . 6
Alignment of CWH under the boiler. . . . . . . . . . . . . . . . 6
Hot Water Can Scald! . . . . . . . . . . . . . . . . . . . . . . . . 6
CWH Mixing valve 7
Mixing valve must be installed . . . . . . . . . . . . . . . . . . . 7
CWH orientation . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mixing valve installation and adjustment . . . . . . . . . . . . . 7
Domestic water piping 8
Piping overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Recirculation (if used) 10
Maintaining domestic water temperature in the supply piping . 10
Time delay at fixtures . . . . . . . . . . . . . . . . . . . . . . . . 10
Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Components required . . . . . . . . . . . . . . . . . . . . . . . .10
Connecting to the water heater . . . . . . . . . . . . . . . . . . .11
Components (see Figure 10) . . . . . . . . . . . . . . . . . . . . 11
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Boiler/CWH piping — 70 or 110 / Right-side mixing valve 12
CONNECTIONS TO BOILER AND SYSTEM . . . . . . . . . . 12
CWH circulator mounting . . . . . . . . . . . . . . . . . . . . . 13
Boiler water connections . . . . . . . . . . . . . . . . . . . . . . 13
Boiler/CWH piping — 70 or 110 / Left-side mixing valve 14
CONNECTIONS TO BOILER AND SYSTEM . . . . . . . . . . 14
CWH circulator mounting . . . . . . . . . . . . . . . . . . . . . 15
Boiler water connections . . . . . . . . . . . . . . . . . . . . . . 15
Boiler/CWH piping — 155 / Right-side mixing valve 16
CONNECTIONS TO BOILER AND SYSTEM . . . . . . . . . . 16
CWH circulator mounting . . . . . . . . . . . . . . . . . . . . . 17
Boiler water connections . . . . . . . . . . . . . . . . . . . . . . 17
Boiler/CWH piping — 155 / Left-side mixing valve 18
CONNECTIONS TO BOILER AND SYSTEM . . . . . . . . . . 18
CWH circulator mounting . . . . . . . . . . . . . . . . . . . . . 19
Boiler water connections . . . . . . . . . . . . . . . . . . . . . . 19
Wiring 20
Connect circulator and sensor harnesses. . . . . . . . . . . . . . 20
Water heater filling and start-up 21
Boiler water restrictions . . . . . . . . . . . . . . . . . . . . . . . 21
Filling the domestic water tank . . . . . . . . . . . . . . . . . . .21
Start-up checklist . . . . . . . . . . . . . . . . . . . . . . . . . . 21
WM97+ control set-up . . . . . . . . . . . . . . . . . . . . . . . 21
Verify operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Homeowner instruction. . . . . . . . . . . . . . . . . . . . . . . 21
CWH control quick set-up 22
Water heater maintenance 23
ANNUAL maintenance . . . . . . . . . . . . . . . . . . . . . . .23
Shutdown procedure . . . . . . . . . . . . . . . . . . . . . . . . 23
WM97+ Control settings — Advanced 24
DHW SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DHW PERFORMANCE: . . . . . . . . . . . . . . . . . . . . . . 25
TANK STORAGE TEMPERATURE: . . . . . . . . . . . . . . . .25
MAX RUN TIME . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ADJUST SCHEDULES (WEEKDAYS / WEEKENDS) . . . . . .25
ADVANCED SETUP: . . . . . . . . . . . . . . . . . . . . . . . . 25
Troubleshooting 29
Troubleshooting procedures . . . . . . . . . . . . . . . . . . . . 29
Preparation for troubleshooting . . . . . . . . . . . . . . . . . . 29
Replacement parts 39
Determine required temperature rise 40
Ratings 41
AHRI ratings 42
Dimensions 43
Page Page
Part number 635-500-156/0113
2
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