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8. Open the water shut-off valve in the return
piping to the unit to fill the shell.
9. Open the water shut-off valve in the supply
piping to the unit.
10. Press the LOW WATER LEVEL RESET
button to reset the low water cutoff and
press the CLEAR button to reset the
Annunciator once the shell is full.
11. Place the ON-OFF switch in the ON
position. The unit is now ready for operation.
6.4 WATER TEMPERATURE FAULT
TEST
1. In AUTO mode allow the unit to stabilize at
its setpoint.
2. Lower the operating temperature limit switch
setting to match the outlet water
temperature. (See Fig. 6.2).
Figure 6.2
Temperature Limit Switch Setting
3. Once the limit switch setting is
approximately at the actual water
temperature indicated by tout, the unit
should shutdown. The fault light should be
flashing and the message "HIGH WATER
TEMP" should be displayed. The ON/OFF
switch should not be illuminated and the unit
should not start.
4. Reset the temperature limit switch setting to
its prior setting.
5. The unit should start once the temperature
limit switch setting is above the actual outlet
water temperature.
SAFETY DEVICE TESTING
6.5 FLAME FAULT TEST
1. Start the unit.
2. Once the unit is firing, close the manual leak
detection valve. This is the valve located
between the safety shut off valve and the
differential gas pressure regulator (See Fig.
6.3).
3. The unit should shut down within 1-2
seconds and indicate a LOCKOUT RUN
FLAME fault on the Annunciator.
4. Leaving the manual leak detection valve
closed, reset the combustion safeguard and
CLEAR the Annunciator
5. Restart the unit.
6. The unit should lockout and display
LOCKOUT START FLAME during ignition.
7. Open the leak detection valve.
Figure 6.3
Manual Leak Detection Valve
9. Reset the Combustion safeguard and
CLEAR the Annunciator.
10. Start the unit.
6.6 AIR PRESSURE FAULT TEST
WARNING!
THIS IS A 120-VOLT AC COMBUSTION
SAFEGUARD SYSTEM. POWER MUST
BE REMOVED PRIOR TO PERFORMING
WIRE REMOVAL OR OTHER TESTING
PROCEDURES THAT CAN RESULT IN
ELECTRICAL SHOCK.
30
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