Install Instructions

52
Water heater temperature regulation
Operating temperature (target)
The electronic control module senses water temperature in
the tank and regulates water heater ignition and firing rate to
achieve a target temperature. The target temperature can be
set between 60°F and 185°F.
High limit operations
The Shield water heater is equipped with a fixed automatic
reset high limit and an adjustable manual reset high limit.
The automatic reset high limit has a set point of 200°F and
the manual reset high limit has a maximum set point of
210°F.
When the outlet temperature exceeds 200°F, the automatic
high limit action occurs. The water heater shuts down until
the outlet water temperature cools below 190°F, and a 60
second timer has expired. If the outlet temperature continues
to increase, the manual reset high limit action will occur at
210°F.
High limit test procedure
10 Operating information
Installation & Service Manual
1. Connect the water heater to 120V power.
2. Note the outlet temperature shown on the display.
3. Press and hold the ENTER and DOWN keys until “P01”
appears in the lower digits on the display.
4. Press and hold the DOWN key until the set point shown
in the upper digits is less than the outlet temperature (or
it reaches its minimum setting, whichever is higher).
5. Press the ENTER key four (4) times. The word “SET” will
appear on the display.
6. Once the outlet temperature reaches the new Manual
Reset High Limit setting, the control will lock out, run
the blower and DHW pump, and display “E15” in the
lower digits on the display. It may be necessary to
activate Service Mode to bring the outlet temperature
above the Manual Reset High Limit set point. Press and
hold the ENTER and UP keys for 5 seconds to activate
Service Mode.
7. Press the ENTER and DOWN keys again until ‘P01”
appears in the lower digits.
8. Press and hold the UP key to readjust the set point to the
desired setting.
9. Press the ENTER key four (4) times. The word “SET” will
appear on the display.
10. Press the RESET key to clear the Manual Reset High
Limit.
11. If Service Mode was activated, press ENTER for 5
seconds to deactivate Service Mode.
Please note that the brackets ([]) denote
screen status.
NOTICE
Adjustable control parameters
Date and time
The control uses an internal clock for the night setback feature
and for logging of events. For these features to work correctly,
the clock must be set when the water heater is first installed or
anytime the water heater has been powered off for more than
15 minutes. Note that hours are displayed as 24 hour time
(2:00PM = 14:00). Days are displayed as a number (Monday =
1, Tuesday = 2, ..., Sunday = 7).
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.
User adjustable parameters
To access the User Adjustable Parameter Menu, press and hold
the ENTER button for five (5) seconds. Once pressed, the
temperature unit’s adjustment will be shown. Press the ENTER
button to cycle to other adjustment values. Once you have
cycled through all of the values, the new values will be saved.
Table 10A User Adjustable Parameters
Code Description
u01 Temperature Units (°C/°F)
u02 Hot Water Set Point
u03 Year
u04 Month
u05 Day
u06 Hour
u07 Minute
Installer settings
Set the Hot Water (HW) Temperature as follows:
1. Press and hold the ENTER button for five (5) seconds.
2. Press ENTER again and the u02 Screen should appear.
3. Press the UP and DOWN buttons to set the temperature.
4. Once you have successfully set the temperature, press the
ENTER button seven (7) times to save your data.