POWER VTX
®
WATER HEATER
31
PV500-68 06/16
10.9 Using the Manual Override Menu (INSTaller Level Access)
The OVERRIDE MENU is helpful during the initial commissioning as well as anytime burner adjustment is
necessary. Manual override controls for the integral tank circulator and the optional SANI pump.
1. Enter the OVERRIDE MENU. Using the arrow buttons, select between the three choices. The default setting is
AUTO. In the AUTO position the operating temperature control will work to control the water temperature based
on the active set point. When manual control of water heater operation is complete, always return this
parameter to the AUTO setting.
2. The second setting is OFF. This setting will stop all control function and prevent the burner from operating.
3. The third setting is HAND. Once enabled, use the NEXT ITEM button to scroll to the next screen. The
TIMEOUT setting is a safety precaution that will disable the override function at the end of the specified time
period if the MAN OVR setting is not returned to AUTO.
4. The next screen is SAN PUMP. To force on the SANI pump, turn this setting to ON.
5. The next screen is HTR PUMP. To force on the integral tank circulator, turn this setting to ON.
6. The next screen is HTR MOD. This setting will override the operating control and using the up and down arrow
buttons, force the burner to fire at the selected firing rate. This function is useful when tuning the operation of
the burner at a range of firing rates.
NOTE:
If the HTR MOD control is activated while the burner is firing, the burner will shut down and recycle.
WARNING: When adjustments are complete and before putting the water heater into service, return the
MAN OVR function back to “AUTO” Failure to return the MAN OVR function to “AUTO” can cause high
water temperatures that can result in property damage, scalding, other serious injury or death.
10.10 Potentiometer (Operating Set Point for Standalone Operation)
The PIM control has the ability to operate independent of the Touch Screen Control Display, in the event that the
control display fails or communication between the two devises is interrupted. Normally the control display is
responsible for regulating the water heater temperature using algorithms which optimize the performance of this
product.
If the control display is unable to function normally the PIM will continue to operate the burner based on an internal
set point which can be adjusted using the potentiometer. This feature is intended to be temporary, since accuracy
of temperature control and the stored water will be reduced.
IMPORTANT
: It is recommended that at the time of
commissioning, the startup technician adjusts the potentiometer
to the desired set point displayed in the OPERATOR screen
located in the SOURCE control system menu. The standalone
set point can be adjusted independently of the DCT but a
specific setting may be difficult to achieve using the temperature
index on the PIM.
