AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 31)

SAFETY DEVICE TESTING
26
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 and LCD displays once the shell
is full.
11. Place the ON-OFF switch in the ON position.
The unit is now ready for operation.
5.4 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. 5.2).
Figure 5.2
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
a minimum of 20
o
F above the set point
temperature.
5. The unit should start once the temperature
limit switch setting is above the actual outlet
water temperature.
5.5 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. 5.3).
3. The unit should shut down within 1-2
seconds and indicate a LOCKOUT RUN
FLAME fault on the LCD display.
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 5.3
Manual Leak Detection Valve
9. Reset the Combustion safeguard and
CLEAR the annunciator.
10. Start the unit.
5.6 AIR PRESSURE FAULT TEST
WARNING!
THIS IS A 120 VOLT AC COMBUSTION
SAFEGUARD SYSTEM. POWER MUST
BE REMOVED PRIOR TO PERFORMING
WIRE REMOVAL, OR TESTING
PROCEDURES THAT CAN RESULT IN
ELECTRICAL SHOCK.
1. Disconnect AC power from the unit.