Lochinvar Hot Water Generator Installation And Operation Manual page 18

6
Maintenance
Power connections - rewiring
If any of the power connections must be rewired at the
circulating pump or electrically activated controls, follow the
steps listed below.
The combination of electricity and water
WARNING
can pose a very dangerous situation. Turn
off / disconnect all electric power before
attempting any maintenance procedure.
1. Follow Steps 1 through 4 of the shutdown procedure
(page 10) to take the unit off-line before attempting any
electrical service.
2. After assuring the power has been turned off, disconnect
and rewire the electrical connections in question.
3. Turn the power on and check that the component that
has been rewired is functioning properly.
4. Slowly open the shutoff valves on the condensate (or
boiler water return) line, cold water inlet line, and hot
water outlet line.
5. Slowly open the shutoff valves on the energy source inlet
line.
Tube bundle
replacement
The tube bundle is the heart of the Lochinvar Hot Water
Generator. It should be removed and inspected every two (2)
years.
Steam or boiler water present situations
WARNING
that can be very dangerous because of the
high temperature and pressures. To avoid
possible injury or death, use common
sense and follow all accepted and
recommended
performing installation, operation, and
maintenance procedures.
The combination of electricity and water
WARNING
can pose a very dangerous situation. Turn
off / disconnect all electric power before
attempting any maintenance procedure.
1. Follow Steps 1 through 5 of the shutdown procedure
(page 10) to take the unit off-line before attempting to
remove and inspect the tube bundle.
2. Assure that the energy source, condensate / water return
line, cold water inlet, and hot water inlet have been shut
off; that the tank has been completely drained; that the
pressure has been bled from both the water and energy
source systems; and that the water, all components, and
surfaces have cooled.
18
- inspection and
procedures when
Hot Water Generator Installation and Operation Manual
3. Carefully break the connections between the tube bundle
head and the energy source inlet and outlet lines.
It may be necessary to break the lines at a
WARNING
second location, and for the lines to be
rotated to allow clearance for the tube
bundle to be removed from the tank. If it
is necessary, care should be taken to ensure
that in-line components are not damaged.
4. Break the bolts loose that secure the tube bundle head
to the tank. After all bolts have been broken loose,
remove them from the unit.
The tube bundle head is heavy and can
WARNING
cause serious injury if it falls on your foot,
leg, etc., use caution.
The tube bundle weight depends on the
WARNING
size installed. A hoist or some type of lift
system should be made available to assist
in removal or installation of the tube
bundle.
5. Remove the tube bundle from the tank, use care not to
damage the soft copper tubes.
6. Inspect for damage or excessive scale, etc.
7. Remove old gaskets and clean gasket sealing surfaces.
8. Reinstall the tube bundle.
Inlet, outlet, and condensate / water
return line and manual shutoff valves -
replacement
If any of the inlet, outlet, return lines, or shutoff valves are
damaged and must be replaced, follow the steps outlined
below.
The combination of electricity and water
WARNING
can pose a very dangerous situation. Turn
off / disconnect all electric power before
attempting any maintenance procedure.
1. Follow Steps 1 through 5 of the shutdown procedure
(page 10) to take the unit off-line before attempting to
replace damaged lines or shutoff valves.
WARNING While it might seem feasible to replace
inlet, outlet, condensate / water return
lines, and shutoff valves without shutting
down the entire unit, it is not advised.
Unless the unit is completely shutdown,
and the water and the energy source are
isolated from the system, failure of a
manual
replacement process could result in serious
injury.
shutoff valve during the