Maintenance - andrews WHiC56 Owner's Manual

Maintenance

Flushing the heat exchanger.
1
button is "ON".
2
Set the temperature more than 60 degrees.
3
Push button again, and water heater turns off.
4
Disconnect electrical power to the water heater.
5
Close the shutoff valves on both the hot
water and cold water lines (V3 and V4).
6
Connect pump outlet hose (H1) to the
cold water line at service valve (V2).
7
Connect drain hose (H3) to service valve (V1).
8
Pour chemical product used to flush heat exchanger
into water (acid 8-10% of water content).
9
Place the drain hose (H3) and the hose H2) to
the pump inlet into the cleaning solution.
10
Open both service valves (V1 and V2)
on the hot water and cold water lines.
11
Operate the pump and allow the vinegar
to circulate through the water heater for at
least 1 hour at a rate of 15 liters per minute.
12
Turn off the pump.
13
Rinse the chemical/water from the
water heater as follows:
a. Remove the free end of the drain hose (H3) from
the pail. Place in sink or outside to drain.
b. Close service valve, (V2), and open shutoff valve,
(V4). Do not open shutoff valve, (V3).
c. Allow water to flow through the water heater for 5 minutes.
d. Close shutoff valve (V4). When unit has finished draining
remove the inline filter at the cold water inlet and clean out
any residue. Place filter back into unit and open valve (V4).
e. Close service valve, (V1), and open shutoff valve, (V3).
14
Disconnect all hose.
15
Restore electrical power to the water heater.
54
3/4" Ball Valve
3/4" Union
Check Valve
Pressure Relief Valve
H3
H2
Circulating Pump
Water
NOTE : Place a bucket under the water heater to
Drain Valve
drain water from the "Water Drain Valve".
Carefully unscrew the "Water Drain Valve"
to rinse flushing solution out of the water
heater for about 10 seconds, then close
the "Water Drain Valve".
KEY
K EY
Pressure Regulator
Circulating Pump
Boiler Drain Valve
S
Solenoid Valve
Noritz
Water Heater
In-line
Filter
V2
V1
V4
V3
Gas
Supply
Hot Cold
Water Water
Line Line
H1