41
7
Start-up
(continued)
Placing the water heater in operation
Water heater operational checks
2. Turn the water heater main power switch to the “ON”
position.
3. Verify operation of the control module and Operator
Interface.
4. Program the adjustable points from the Operator
Interface.
5. Push the reset for the low water cutoff (if equipped).
6. Ensure that maximum flow to the water heater does not
exceed 75 GPM on Models 500 - 1000 and 90 GPM on Models
1500- 2000. Verify by checking temperature rise while
burner is firing at 100% of rated input.
7. Install a manometer on the gas supply to the water heater
and verify minimum gas supply pressure as the burner fires at
100% of rated input.
8. Verify operation of safeties as necessary (low water
cutoff, high limit, gas pressure, etc.,).
9. Verify that all adjustable points in the Operator
Interface are set as required.
Installation & Operation Manual
Water heater operation
10. Water heater should begin the start-up process for the
sequence of operation.
11. The water heater will ignite at the proper ignition speed and
will then modulate to meet the system demand.
12. Ensure that inlet water temperature does not fall below
the specified minimum for the water heater.
13. Based on system demand, water heaters may run for an
extended period of time at a reduced rate of input to
maximize
efficiency.
14. As system demand is satisfied, the burner will cycle off
and the combustion air blower will run for a post
purge operation before the water heater shuts down.
Start the water heater
1. Read and follow the Operating instructions in FIG. 7-2, on
page 42.
If water heater does not start correctly
1. Check for loose connections, blown fuse or service switch
off?
2. Is external limit control (if used) open? Is water temperature
above 200°F (93.3°C)?
3. Is thermostat set below tank temperature?
4. Is gas turned on at meter or water heater?
5. Is incoming gas pressure less than 4 inches water column?
If none of the above corrects the problem, refer to the
Troubleshooting
section of the VF Series Service Manual.
The venting system must be installed so that
it will prevent flue gas spillage and carbon
monoxide emissions, which will result in
severe personal injury or death.
WARNING
Set clock
The control has a built-in clock that it uses for its night setback
feature and for logging events. This clock must be set when
the appliance is installed, and anytime the appliance has been
powered off for more than one month. Use the following
procedure to set the clock:
1. Press and hold the SETUP/RETURN button (FIG. 8-1) for
at least 5 seconds.
2. The display changes to ready “ENTER MENU CODE”,
with four (4) zeros below it.
3. Change the zeros to match the user code (factory set at
“0704”). Use the (+) and (-) buttons to increment or
decrement the flashing digit, and the FORWARD and
BACK buttons to select which digit flashes.
4. Press the SAVE/CLEAR button.
5. The display changes to read USER CODE for a few
seconds, then displays a menu.
6. Press the SAVE/CLEAR button.
7. Press the (+) button twice to display “A3 DATE AND
TIME”.
8. Press the SAVE/CLEAR button once.
9. The date and time are displayed as “YY:MM:DD W
hh:mm”,
where:
mm:
minutes
hh: hour (24 hour time; e.g., 2:00 PM = 14:00)
W:
day of the week (1 = Sunday, 2 = Monday,
3 = Tuesday, etc.,)
YY: year
MM:
month
DD:
date
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.
Use the (+) and (-) buttons to increment or decrement the
flashing number, and the FORWARD and BACK buttons to
select which number flashes.
10. Press the SAVE/CLEAR button to save the setting.
11. Press the SETUP/RETURN button twice to exit the
Programming
Mode.
