Hot Water Generator Installation and Operation Manual
6Maintenance
Temperature control valve (optional) - inspection and replacement
The temperature control valve is installed adjacent to the tube bundle. The manufacturer’s documentation included with the unit gives specifics for operation and maintenance of the control valve. The CAD drawing included with the unit will give the exact location, as well as interlocks with other components. This information should be reviewed before removal / replacement of the temperature control valve.
7. | Remove the temperature control valve from the system. |
8. | Follow the supplied manufacturer instructions for |
| inspecting the valve. If found to be malfunctioning, |
| replace the valve. |
9. | Carefully replace the temperature control valve into the |
| system by reattaching it to the energy source inlet line and |
| the tube bundle outlet line. 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. |
WARNING
Steam or boiler water present situations that can be very dangerous because of the high temperatures and pressures. Use common sense and follow all accepted and
recommended procedures when performing installation, operation, and maintenance procedures to avoid possible injury or death.
10. | Align the valve as it was situated before removal and |
| tighten the connections. If lines were broken at an |
| additional location to allow for removal of the valve, be |
| sure to also tighten those connections. |
11. | Reconnect the temperature control valve to the system |
| interlocks and install the sensing probe into the tank. |
WARNING
The combination of electricity and water can pose a very dangerous situation. Turn off / disconnect all electric power before attempting any maintenance procedure.
WARNING
If the unit is equipped with a circulating pump, the pump relay must be interlocked with the temperature control valve so that the energy source will shut off if the pump is not operational. Failure to do so could
1.Follow Steps 1 through 5 of the shutdown procedure (page 10) to take the unit
2.Assure that the energy source, condensate / water return line, cold water inlet, and hot water outlet 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 all components and surfaces have cooled.
3.If the temperature control valve is electrically activated, turn off the power and disconnect the leads to the valve.
4.Remove the control valve probe from the tank port.
5.Carefully break the joints between the temperature control valve and the unions on either side of the valve per FIG.’s 5 and 6 on page 6 of this manual.
6.Carefully break the connections between the energy source inlet line and the tube bundle.
NOTICE | It may be necessary to break the lines at | |
a second location, and for the lines to be | ||
| ||
| rotated to allow clearance for the | |
| temperature control valve to be | |
| removed from the system. If it is | |
| necessary, care should be taken to | |
| ensure that | |
| damaged. |
create a very dangerous situation if the pump were to fail.
12.Follow the startup procedure (page 10) to put the unit back
Strainers - inspection and replacement
The strainers are installed upstream of the energy source shutoff valve for the main traps. These strainers must be blown down periodically (approximately every three (3) to six
(6) months) to prevent the build up of any sediment.
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
2. The location of the strainers can differ between packages. Reference FIG.’s 3 and 4 on page 5 of this manual to identify the location of the strainers on the unit.
3. Carefully break the line connections on the inlet side of both strainers.
4. Carefully break the line connection on the outlet side of the strainers.
5. Remove and examine the strainers.
20 