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User Manual - Page 36

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36 VC Series Manual
Temperature Opons Without a Temperature Controller
The default temperature seng for this appliance installed without a temperature controller is 120° F (49° C). If
desired, the temperature seng can be changed to 140° F (60° C) by adjustment of a switch.
In the SW1 Dip switch (tan switches), set switch 5 to ON to obtain 140° F water temperature seng. Set switch
5 to OFF (default) to obtain 120° F water temperature seng. If a temperature controller is installed, then
switch 5 has no eect on temperature sengs.
Seng Controller to Mute
On the MC-91-2 to eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both
the up and down buons unl a beep is heard (approximately 5 seconds).
Locking the Controller
The MC-91-2 controller can be locked by pressing the Priority buon and the up buon together for 5 seconds.
A beep will sound conrming that the controller is locked. The display will alternately show “LOC”, the
temperature seng, and a diagnosc code if one has been acvated. All of the controllers in the system are
also locked.
To unlock the controller press the Priority buon and the up buon together for 5 seconds.
To Display Diagnosc Informaon
To display the most recent diagnosc informaon codes press and hold the “On/O” buon for 2 seconds on
the MC-91-2 controller. While holding the “On/O” buon press the up buon. The last 9 diagnosc codes will
ash one aer the other. To exit this mode press the “On/O” and up buon as before.
To enter or exit the maintenance monitor informaon mode press and hold the down buon for 2 seconds and
without releasing it press the ON/OFF buon.
To obtain the water ow rate press the up or down buons unl “01” displays. The water ow rate will then
appear. For example “58” means 5.8 gal/min.
To obtain the outgoing water temperature press the up or down buons unl “02” displays. The temperature
will appear in degrees Fahrenheit.
Diagnosc Codes
This water heater is designed to display diagnosc codes. If there is a potenal operaon concern refer to the
code and remedy on the next page.
Data Unit No.
Water ow rate 0.1 gal/min 01
Outgoing water temperature Degrees Fahrenheit 02
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