CWH companion water heater — Product Manual
WM97+ Control settings — Advanced
(continued)
Figure 21 Default DHW Performance Mode Settings menus (see Figure 19, page 24 for access information)
Parameters HIGH NORMAL ECONOMY VACATION
DISABLED/
OFF
Description of Parameter
Tank Storage Target —
Upper Sensor Set Point
170°F 150°F 135°F 50°F None Target temperature to modulate boiler output to.
Boiler will modulate to either BOILER TARGET or
DHW Storage Target.
Tank Diff On
2°F 2°F 2°F 0°F Call for heat starts if upper tank temperature drops
below:
Tank Storage
minus
Diff On
Tank Sensor Diff
10°F 10°F 10°F 0°F Call for heat starts if lower tank temperature drops
below:
Tank Storage
minus
Sensor Diff
minus
Diff On
Boiler Target —
When Upper Tank Temperature is
lower than:
Tank Storage
minus
Diff On
185°F 170°F 150°F 100°F Maximum boiler outlet temperature the control
should use for the performance mode.
Boiler Diff On
2°F 2°F 2°F 10°F Boiler restarts burner if there is a demand and boiler
temperature has dropped below:
Boiler Target
minus
Boiler Diff On
Boiler Diff Off
10°F 10°F 10°F 10°F Control shuts down the burner if boiler supply water
temperature exceeds:
Boiler Target
plus
Boiler Diff Off
Minimum DHW
Blower Speed —
minimum RPM the
blower can target
during a DHW call
WM97+70 1100 1100 1100 1100 The adjustment limit for these are linked to the
boiler's absolute min as well as High Altitude.
See WM97+ Boiler manual for instructions to change
blower speed.
WM97+110 1400 1400 1400 1400
WM97+155 1300 1300 1300 1300
Maximum DHW
Blower Speed —
maximum RPM the
blower can target
during a DHW call
WM97+70 4300 4300 4300 4300 The adjustment limit for these are linked to the
boiler’s absolute max as well as High Altitude.
See WM97+ Boiler manual for instructions to change
blower speed.
WM97+110 5650 5650 5650 5650
WM97+155 5500 5500 5500 5500
Part number 635-500-156/0113
27
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