Weil-McLain PLUS LINE PLUS-E017-A/1206 Manual Do Utilizador



Part Number PLUS-E017-A/1206

 Indirect-Fired Water Heaters – Series 3

Installation and start-up of 

water heaters connected to 

steam boilers

See Figure 29, page , for suggested piping schematic.

Pipe the domestic water connections to the water heater

per Section A of this manual.
•  Boiler  connections  for  the  water  heater  must  be

below the water line.

•  For steam piping, refer to the boiler manual.
•  Replace the automatic air vent furnished with the

water heater with a manual air vent.

•  Wire the water heater and circulator to the boiler

per suggested wiring in Figure 29.

•  Close isolation valves  and  (Figure 29) to isolate

the boiler.

•  Fill the boiler to the recommended water level per

the boiler manual. Fill the domestic side of the water

heater per Section A of this manual.

•  To fill the water heater outer tank with boiler water,

isolation valves  and  must remain closed. Valves

1 and 2 should be fully opened. Drain valves  and

 should also be fully opened.

•  Open the water heater manual air vent to bleed the

system of air.

Open the water heater manual air

vent one turn only.

•  Fill the boiler/water heater system through drain

valve  until a steady stream of water flows through

drain valve , initially purging the system of air.

•  Continue to fill the boiler/water heater system while

closing drain valve .

•  When  drain  valve    is  fully  closed  and  a  steady

stream of water is exiting at the air vent, close the

manual air vent tightly. Drain valve  can now be

closed.

Water may spray from the manual

air vent.

•  Open isolation valve  (at the front of the boiler).

Then open valve .

•  Start the boiler per instructions given in the boiler

manual.

Connecting water heater to 

steam boiler

When  designing  steam  and  domestic  hot  water  sys-

tems,  there  are  some  key  issues  that  must  be  taken

into consideration during the initial design phase. By

designing the system properly from the start, you can

avoid problems and have a hot water loop in a steam

boiler system.

•  Keep the loop temperature below the flash point.

Flashing can result in noise and circulator damage

or shortened life.

•  Be sure the loop is completely closed, with no au-

tomatic air vents or anything that could allow air

to enter the system when the pump shuts off. Use

manual air vents only to prevent the possibility of

flooding the boiler.

•  Pipe supply from one side of the boiler, return to

the opposite side.

•  Supply  from  a  tapping  that  is  high  enough  to

prevent introducing sediment into the piping and

circulator yet still positions the circulator below the

water line. Avoid the mud leg of the boiler.

•  Use an all bronze circulator (avoid wet rotor circula-

tors). This will reduce clogging and will resist the

corrosion potential from the steam condensate.

•  Make  sure  the  circulator  is  properly  sized.  If  the

pump  runs  too  far  out  on  the  curve,  cavitation

potential increases significantly.

•  Return  piping  should  be  dedicated  domestic  re-

turn.

•  Use (2) flow/check valves as shown to reduce the

potential for gravity circulation. Do not use spring-

loaded check valves in place of the flow/check valves

shown in Figure 29 on page .

ON STEAM BOILER APPLICATIONS ONLY — You must replace the automatic air vent

supplied with the water heater with a manual air vent. Failure to do so could result in severe

personal injury, death or substantial property damage.

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