Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 5 – SAFETY DEVICE TESTING
OMM-0078_0M
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
69
of
216
GF-128
Phone: 800-526-0288
09/11/2015
5.4 LOW WATER LEVEL FAULT TEST
To simulate a low water level fault:
Low Water Level Fault Test
1.
Set the ON/OFF switch to the
OFF
position
2.
Close the water shut-off valves in the supply and return piping to the unit.
3.
Slowly open the drain valve on the rear of the unit. If necessary the unit’s relief valve may
be opened to aid in draining.
4.
Continue draining the unit until a
LOW WATER LEVEL
fault message is displayed and
the
FAULT
indicator flashes.
5.
Place the unit in the Manual mode and raise the valve position above 30%.
6.
Set the ON/OFF switch to the
ON
position. The
READY
light should remain off and the
unit should not start. If the unit does start, shut the unit off immediately and refer fault to
qualified service personnel.
7.
Close the drain and pressure relief valve used in draining the unit.
8.
Open the water shut-off valve in the return piping to the unit.
9.
Open the water supply shut-off valve to the unit to refill.
10.
After the shell is full, press the
LOW WATER LEVEL RESET
button to reset the low water
cutoff.
11.
Press the
CLEAR
button to reset the
FAULT
LED and clear the displayed error message.
12.
Set the ON/OFF switch to the
ON
position. The unit is now ready for operation.
5.5 WATER TEMPERATURE FAULT TEST
A high water temperature fault is simulated by adjusting the
Automatic Reset Over-
Temperature Limit
switch. This switch is accessible from the front of the unit as shown in
Figure 5-2.
Water Temperature Fault Test
1.
Start the unit in the normal operating mode. Allow the unit to stabilize at its setpoint.
2.
Lower the adjustable
Automatic Reset Over-Temperature Limit
switch setting to match
the displayed
OUTLET TEMPERATURE
.
3.
Once the
Automatic Reset Over-Temperature Limit
switch setting is approximately at,
or just below, the actual outlet water temperature, the unit should shut down. The
FAULT
indicator should start flashing and a
HIGH WATER TEMP SWITCH OPEN
fault
message
should be displayed. It should not be possible to restart the unit.
4.
Reset the adjustable over-temperature switch to its original setting.
5.
The unit should start once the
Automatic Reset Over-Temperature Limit
switch setting
is above the actual outlet water temperature.
