John Wood Power Direct Vent (ENERGY STAR) - Manual (Page 20)

First Lighting
CAUTION:
Read before proceeding. If you do not follow
these instructions exactly, a fire or explo-
sion may result, causing property damage,
personal injury or loss of life.
This appliance is equipped with an ignition device, which
automatically lights the pilot. Do not try to light manually
with a match.
The temperature dial is adjusted to its lowest temperature
position when shipped from factory.
Gas Control
This heater is equipped with a combination gas control/
igniter. It will perform these functions:
1. Upon call for hot water, the gas control will energize the
igniter, which lights the main burner.
2. When the main burner is lit, the gas control will monitor
electronically the presence of a fl ame.
3. When the water temperature has been reached, the gas
control will turn off gas supply to the burner.
Robertshaw 2000N WDER Operation
A green LED on the front of the control is used to flash a
system status code indicating the operational state of the
control (see Table 3). When initially energized, with the tem-
perature dial set at vacation, the control will:
1. Perform a self-diagnostic check. The LED will fl ash a
system status code to indicate that it is in vacation mode.
2. On a call for heat, check to ensure the air pressure
switch on the blower is in the open position. If closed the
sequence pauses and the blower is not energized.
3. With the air pressure switch proven open, the control
energizes the blower.
4. With the blower energized the control checks to ensure the
air pressure switch closes. At this point the air pressure
switch must close or the blower will run continuously.
5. The high limit switch on the blower is wired in series with
the air pressure switch, so both switches must be closed
or the blower will run continuously. With proven airfl ow
and the high limit switch closed, a fl ame safety check
is undertaken to ensure a fl ame is not present prior to
ignition.
6. Providing a fl ame present signal is not detected, the hot
surface ignitor is energized and a warm up period of
approximately 17 seconds is initiated.
7. Following the ignitor warm up period, the control allows
gas to fl ow to the burner initiating a 4 second trial for
ignition period.
8. If a fl ame cannot be established within the trial for ignition
period, is extinguished or the fl ame signal drops below
0.7 microamps, the control will stop the fl ow of gas to
the burner.
9. The blower continues to be energized and a 30 second
inter-purge is undertaken.
10. The control will attempt for ignition again. If a fl ame cannot
be established after three attempts, it will go into a soft
lockout state.
FLASH SEQUENCE SYSTEM STATUS
Slow Flash
Water Heater is in Stand-by
Mode.
Fast Flash
Water Heater is in Heat
Mode.
Steady ON System Error; Cycle Power
1 flash
Pause for 1 second
1 flash
Pause for 3 seconds
Ignition Failure.
3 flashes 1 flash
Pressure Switch Fails to
Open.
3 flashes 3 flashes
Pressure Switch Fails to
Close.
4 flashes 1 flash Line/Neutral Polarity Failure.
4 flashes 2 flashes ECO Failure.
4 flashes 3 flashes False Flame.
5 flashes N/A Vacation Mode Active.
Table 3. System Status Codes
11. The LED on the control will fl ash a system status code
indicating the lockout state due to ignition failure (see
Table 3).
12. Unplugging the power cord then reinserting it into the
electrical receptacle will reset the control. Alternatively,
the control will automatically reset itself approximately 20
minutes after entering the soft lockout state.
13. The control will normally establish a fl ame and maintain
the fl ame until the call for heat is satisfi ed.
14. After the burner is lit, the gas control/thermostat will
electronically monitor the presence of a fl ame.
15. When the desired water temperature has been reached,
the gas control/thermostat will stop the fl ow of gas to the
burner.
Temperature Adjustment
The temperature dial is adjusted to its lowest tempera-
ture position when shipped from factory.
The temperature of the water can be selected by setting
of the temperature dial on the front of the gas control (see
Figure 18). The large arrow position on the thermostat is the
preferred starting point for setting the temperature control.
Each division on the thermostat dial represents a 5.5°C
(10°F) water temperature change. Energy conservation is a
consideration when selecting the water temperature setting.
For most economical operation, select a water temperature
that is adequate for your needs. There is a hot water scald
potential if the thermostat is set too high.
WARNING
Risk of scalding
Hot water can produce third degree burns
in 6 seconds at 60°C (140°F)
in 30 seconds at 54°C (130°F)
in 5 minutes at 49°C (120°F)
– 20 –