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

First Lighting
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/ignit-
er. 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 flame.
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 2). When initially energized, with the tem-
perature dial set at vacation, the control will:
1. Perform a self-diagnostic check. The LED will flash 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 pres-
sure switch must close or the blower will run continu-
ously.
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
airflow and the high limit switch closed, a flame safety
check is undertaken to ensure a flame is not present
prior to ignition.
6. Providing a flame 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 flow to the burner initiating a 4 second trial for
ignition period.
8. If a flame cannot be established within the trial for igni-
tion period, is extinguished or the flame signal drops
below 0.7 microamps, the control will stop the flow 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 flame can-
not be established after three attempts, it will go into a
soft lockout state.
11. The LED on the control will flash a system status code
indicating the lockout state due to ignition failure (see
Table 2).
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 flame and maintain
the flame until the call for heat is satisfied.
14. After the burner is lit, the gas control/thermostat will
electronically monitor the presence of a flame.
15. When the desired water temperature has been
reached, the gas control/thermostat will stop the flow 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 16). 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.
– 20 –
SYSTEM STATUS
Water Heater is in Stand-by
Mode.
Water Heater is in Heat
Mode.
System Error; Cycle Power
1 flash 1 flash 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.
FLASH SEQUENCE
Pause for 1 second
Pause for 3 seconds
Slow Flash
Fast Flash
Steady ON
Table 2 System Status Codes
CAUTION:
Read before proceeding. If you do not follow
these instructions exactly, a fire or explosion
may result, causing property damage,
personal injury or loss of life.
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)