Hot Water Generator Installation and Operation Manual
6Maintenance (continued)
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
The combination of electricity and water WARNING 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
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
The combination of electricity and water WARNING 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
Figure 9_Pump Wiring Diagram
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