Instruction manual

Finned copper tube gas boilers & water heaters – Control manual

Conﬁguring for DHW applications

SCALD HAZARD — Water over 125°F can

cause severe burns or death.

Provide temperature regulating, anti-scald devices in DHW

supply piping to xtures to prevent possibility of severe injury

or death due to scalding.

DHW options

e HeatNet control allows four options for providing DHW

heating. ese are:

Method 1 — ❑ A tank-temperature sensor, connected to

the DHW Sensor input allows direct control of tank tem-

perature. Method 1 can be used for combined space heat-

ing/DHW systems.

is control method is designed to limit tank temperature

to a specied maximum. It can cause short cycling in some

cases. If the tank temperature can be allowed to vary above

and below a setpoint temperature and the application is

DHW heating only, you can use method 3 instead.

Method 2 — A ❑ tank temperature aquastat in the tank

turns one boiler on and o on demand. Method 2 can be

used on combined space heating/DHW systems.

Method 3 — ❑ A tank-temperature sensor, connected to

the Header sensor input of the master boiler allows direct

control of the tank temperature. e ring and sequencing

of boilers operates just as when used space heating applica-

tions. is method is limited to dedicated DHW systems.

Method 4 — ❑ 4–20 ma remote controller. is can be ap-

plied for a single boiler (or single member boilers) or for all

boilers of a network.