Hot Water Generator Installation and Operation Manual
2Installation
Connecting the energy source
(Steam or boiler water)
WARNING
Do not attempt to lift condensate with a float and thermostatic trap. Pipe the condensate outlet from the main steam
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.
trap to a gravity drain or to a condensate pump.
Lifting condensate without the assistance of a condensate pump can cause erratic temperature control, failure of the tube bundle, damage to the control valve, or damage to the condensate trap. Any failure caused due to lifting of condensate without a condensate pump is not covered by the
Assure that a manual shutoff valve is installed upstream in the steam or boiler water line (energy source), and that it is functioning properly. If any doubt exists concerning the integrity of the shutoff valve, replace the valve before attempting installation. All energy source valves should be closed and remain closed throughout the installation process.
Connect the energy source to the line(s) leading to the temperature control valve. The exact location of the temperature control valve for the specific unit, as well as energy source pipe diameter and thread size, can be determined from the CAD drawing(s) supplied with the unit.
NOTICE | For all energy source piping connections, | |
the use and / or type of joint compound or | ||
| ||
| sealer on the joint should be determined by | |
| referring to local codes, accepted practices, | |
| or the requirements of the installing | |
| contractor. |
Connecting the steam condensate line or the boiler water return lines
Steam condensate return line
As the heat is extracted from the steam and transferred to the water heating system, condensate will form. This condensate must have a means by which it can drain from the unit and return to the steam system. The condensate return line serves this purpose.
The condensate return line should be connected to the unit at the condensate return port. The condensate port is normally located downstream from the main and auxiliary traps. The exact location of this port for the specific unit, as well as the condensate return pipe diameter and thread size, can be determined from the CAD drawing(s) supplied with the unit. The condensate line should be piped back into the site’s steam system for recycling.
A manual shutoff valve should be installed downstream in the condensate return line to allow the unit to be isolated from the system. The condensate shutoff valve will prevent backflow of steam if the line is disconnected.
warranty.
Boiler water and high temperature water return line
After the boiler water has passed through the tube bundle, and the heat has been extracted and transferred to the domestic water system, the water must return to the system. The water return line serves this purpose.
The water return line should be connected to the unit at the return port. Unlike the steam condensate return line, the return lines for boiler water do not have
A manual shutoff valve should be installed downstream in the water return line to allow the unit to be isolated from the system. The water return shutoff valve will present backflow of boiler water if the line is disconnected.
Piping the relief valves to drain
All Lochinvar Hot Water Generators are equipped with a pressure relief valve for the tank. The valve should be piped to a vent line leading to a suitable drain. Piping the pressure relief valves to suitable drains will prevent both water and heat damage to the unit, as well as reduce the risk of injury from released steam or water. The pipe must be of adequate size to properly handle the capacity of the relief valve and vent line. Check local codes to assure compliance.
If a check valve has been installed on the inlet water line, thermal expansion may take place causing build up of excessive pressure when the water is being heated. This expansion will cause the relief valve to open, releasing hot water to the vent line.
8
