CWH companion water heater — Product Manual
Troubleshooting
(continued)
5 Check for air in the system
• An air-bound water heater or boiler will not circulate system water properly, resulting in a lack of heat
transfer.
• Air can be trapped in piping loop sections, the tank coil or the flexible water lines between the boiler and
CWH.
• Connect a drainage hose to the boiler supply piping purge valve (shown in WM97+ manual suggested
piping).
• Close the WM97+ internal by-pass valve (be sure to return to normal position after purging).
• Allow water to flow into the boiler return line from the make-up water connection to the system.
• Allow water to flow until air bubbles no longer appear in the discharge from the drainage hose.
• Remove drainage hose and return by-pass valve to the normal position.
6 Clean the boiler water system.
• A dirty boiler system can cause deposits to form on the water heater coil. This insulates the coil, reducing
the heat transfer.
• Clean the boiler system per the boiler manufacturer’s instructions.
• Install a strainer in the boiler piping on older installations or for systems likely to carry sediment.
7 Check tank temperature setting
• Follow directions in this manual to navigate to the tank temperature setting menu.
• Increase the setting if necessary.
• Also check the operating mode. Change mode to “High-max performance” if water heater is set to another
mode.
8 Check DHW circulator speed
• The CWH is supplied with a 3-speed circulator. The speed switch on the circulator must be set to:
• Speed 1 for WM97+70 or 110 boilers.
• Speed 3 for WM97+155 boilers.
Insufficient hot water (continued)
Part number 635-500-156/0113
32
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