6
Maintenance
(continued)
Hot Water Generator Installation and Operation Manual
Component(s) replacement
Circulating pump - inspection and
replacement
Lochinvar Hot Water Generators can be equipped with a
circulating pump to assist in the even heating of the water. If
the unit is equipped with a circulating pump, the following
procedure should be followed to replace the pump.
1.
Follow Steps 1 through 5 of the shutdown procedure
(page 10) to take the unit off-line before attempting to
service the circulating pump.
WARNING
The combination of electricity and water
can pose a very dangerous situation. Turn
off / disconnect all electric power before
attempting any maintenance procedure.
2.
Refer to the manufacturer’s documentation supplied
with the unit pertaining to testing the pump. If found to
be defective or questionable, replace the pump by
continuing with the steps that follow.
3.
After assuring that the power has been turned off,
disconnect the electric leads to the circulating pump
(FIG. 9).
4.
Close the manual shutoff valves located near the inlet and
outlet ports of the pump.
5.
Break the joints between the pump and the inlet and
outlet piping. Remove the pump.
6.
Reconnect the pump to the inlet and outlet piping.
Follow recommendations contained in the
manufacturer’s documentation, local codes, or accepted
contractor practices as to the use and / or type of joint
compound or sealer at the connections.
7.
Open the manual shutoff valves located on the inlet and
outlet sides of the pump and check for any leakage at the
joints.
8.
Reconnect the electric leads to the pump (reference
FIG. 9 to assure proper wiring).
9.
Follow the startup procedures (page 10) to put the unit
back on-line. Carefully check all connections for any sign
of leakage.
Circulating pump shutoff
valves -
replacement
If the Lochinvar Hot Water Generator is equipped with a
circulating pump to assist in the even heating of the water,
manual shutoff valves will be located on both the inlet and
outlet side piping. To replace the valves, follow the procedure
detailed below.
1.
Follow Steps 1 through 5 of the shutdown procedure
(page 10) to take the unit off-line before attempting to
service the circulating pump shutoff valves.
WARNING
The combination of electricity and water
can pose a very dangerous situation. Turn
off / disconnect all electric power before
attempting any maintenance procedure.
2.
After assuring that the power has been turned off,
disconnect the electric leads to the circulating pump
(FIG. 9).
3.
Break the joints between the pump and the inlet and
outlet piping. Remove the pump.
4.
Remove the shutoff valves.
5.
Install the new valves.
Follow recommendations
contained in the manufacturer’s documentation, local
codes, or accepted contractor practices as to the use and /
or type of joint compound or sealer at the connections.
6.
Reconnect the pump to the inlet and outlet piping.
Follow recommendations contained in the
manufacturer’s documentation, local codes, or accepted
contractor practices as to the use and / or type of joint
compound or sealer at the connections.
7.
Open the manual shutoff valves located on the inlet and
outlet sides of the pump.
8.
Reconnect the electric leads to the pump (reference
FIG. 9 to assure proper wiring).
9.
Follow the startup procedures (page 10) to put the unit
back on-line. Carefully check all joints for any sign of
leakage.
Figure 9
_Pump Wiring Diagram
17
