CWH companion water heater — Product Manual
WM97+ Control settings — Advanced
(continued)
DHW SETTINGS
1. If a CWH is used, the settings for control operation during
CWH calls for heat are set under the DHW SETTINGS menus.
2. The settings apply ONLY to Zone 1.
DHW PERFORMANCE:
1. Use this setting to select which performance mode is desired.
a. High – Max Hot Water
b. Normal
c. Economy – Max Savings
d. Off-Disable
e. Vacation (when user needs the CWH off or user is on
vacation.
f. Schedule (if user wants to set different performance modes
at different times throughout the day.
2. The temperature presets are chosen based on normal best
setting for CWH performance modes.
3. The temperature values can be changed by a technician using
the ADVANCED SETUP menu.
TANK STORAGE TEMPERATURE:
1. Use this setting to change the CWH tank storage temperature
only.
2. When changing this setting, DHW PERFORMANCE will be
set to CUSTOM.
3. This temperature will not be saved if the user changes DHW
PERFORMANCE modes.
4. It is recommended to change the DHW tank storage tempera-
ture in the ADVANCE SETUP menu, when needed, under
the appropriate DHW PERFORMANCE mode. ADVANCED
SETUP is accessible from the CONTRACTOR DHW SET-
TINGS menu.
MAX RUN TIME
1. This is the longest time the boiler will continue in DHW
mode before switching to space heating (if there is a space
heating call).
2. Setting MAX ON TIME to off will cause the control to never
switch to space heating while CWH call for heat is present.
This could present a freeze hazard for some installa-
tions if the CWH temperature sensors were reading
incorrectly and created a constant call to the control.
ADJUST SCHEDULES (WEEKDAYS /
WEEKENDS)
1. Use this setting to setup a schedule during the weekdays and
weekends to have the DHW performance modes change at
certain times throughout the day.
2. For example, the user can have the CWH at HIGH – MAX
HOT WATER during peak demand times, and ECONOMY
– MAX SAVINGS during times of the day when domestic hot
water is unlikely to be used.
ADVANCED SETUP:
1. Use this setting to adjust and customize the operating pa-
rameters for HIGH – MAX HOT WATER, NORMAL, and
ECONOMY – MAX SAVINGS.
TO DISABLE CWH OPERATION AND
REVERT TO HEATING OPERATION
ONLY
1. To disable CWH operation and revert to space heating only
operation:
a. Turn off power to the WM97+ boiler.
b. Remove the WM97+ boiler front door panel.
c. Rotate the control housing forward.
d. Disconnect the sensor wiring harness connection (see
page 20 for location).
e. Restore the control housing to upright position.
f. Replace the boiler front door panel.
2. Visually inspect boiler front door to be sure it is sealed all
around its perimeter. Verify that the two door latches are tight.
The boiler front door must be securely fastened to
the boiler to prevent boiler from drawing air from
inside the boiler room.
This is particularly important if the boiler is located
in the same room as other appliances.
Failure to keep the door securely fastened could
result in severe personal injury or death.
3. Turn power on to the boiler.
Part number 635-500-156/0113
25
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