Flushing The Heat Exchanger - Giant Factories ANSI Z21.10.3 Owner's Manual

Freeze Protection
In case of freezing weather, make sure that the water heater and its
water lines are adequately protected to prevent freezing. Damage
due to freezing is not covered by the warranty.
Winterizing
These recommendations are intended to suggest practices which
are effective for winterizing the water heater. They should be used
as a guide only. No liability is assumed for any issues resulting
from the use of this information.
GAS
Shut off the gas to the water heater. It is generally preferable
to shut off the gas service to the entire location if gas is not
going to be used.
WATER
Shut off the cold water supply to the water heater. It is gen-
erally preferable to shut off the water to the entire location if
water is not going to be used.
Drain the water heater by opening the drain valves on the cold
water line and hot water line.
Régulateur de pression
Open several hot water taps and remove the filter assembly
Pompe de circulation
at the water inlet in order to allow room for expansion in case
Robinet de vidange
there is water in the lines that freeze.
de la chaudière
Électrovanne
ELECTRIC
Disconnect the power supply by either unplugging the electri-
cal cord or by turning off the circuit breaker to the water heat-
er to prevent potential damage from irregular power surges
or interruptions.
VENT TERMINATION
Place a cover over the vent termination (intake and exhaust) if
it can be safely accessed. The cover should be easy to apply
and remove. This will prevent debris, leaves, and small ani-
mals from entering the venting and water heater which could
cause air flow issues upon return to service.

Flushing the heat exchanger

A LC0~LC9 or "00", or 58 diagnostic code indicates the unit is be-
ginning to lime up and must be flushed. Failure to flush the appli-
ance will cause damage to the heat exchanger. Damage caused by
lime build-up is not covered by the unit's warranty. Giant strongly
recommends installation of isolation valves to allow for flushing of
the heat exchanger.
1) Disconnect electrical power to the water heater.
2) Close the shutoff valves on both the hot water and cold wa-
ter lines (V3 and V4).
3) Connect pump outlet hose (H1) to the cold water line at ser-
H3
vice valve (V2).
4) Connect drain hose (H3) to service valve (V1).
5) Pour four (4) gallons (15.1 litres) of undiluted virgin, food
grade, white vinegar into pail.
6) Place the drain hose (H3) and the hose (H2) to the pump
H2
inlet into the cleaning solution.
7) Open both service valves (V1 and V2) on the hot water and
Pompe de circula on
cold water lines.
Circulating Pump
8) Operate the pump and allow the vinegar to circulate through
the water heater for at least one (1) hour at a rate of four (4)
gallons (15.1 litres) per minute.
SYSTEM MAINTENANCE
Rinnai
Water Heater
Filtre
en
série
V2
V1
V4
V3
Conduite Arrivée
d'eau du gaz
Conduite
chaude
d'eau
froide
H1
9) Turn off the pump.
10) Rinse the vinegar 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 five (5)
minutes.
d) Close shutoff valve (V4). When unit has finished drain-
ing remove the in-line 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).
11) Disconnect all hose.
12) Restore electrical power to the water heater.
Figure 45
3/4" Ball Valve
3/4" Union
Check Valve
Pressure-Relief Valve
Following flush procedure,
call technical assistance
(1-800-363-9354) for PCB
reset information.
H3
H2
Circulating Pump
47
KEY
Pressure Regulator
Circulating Pump
Boiler Drain Valve
S
Solenoid Valve
Rinnai
Water Heater
V2
V1
V4
V3
H1