Dunkirk ARTESIAN 220 Installation And Operating Instructions Manual page 34

Zone Valves (2 Way Priority)
Figure 17 shows a connections diagram for a priority zone system using Honeywell V8043F
motorized valves. An R8285B relay is used which is equipped with its own transformer and a set
of D. P. D.T contacts.
The water heater control is connected to terminals R and G on the R8285B so when the water
heater control calls for heat, the relay coil is energized. One side of the transformer is connected
to the common contact. The normally closed contact is connected to all space heating
thermostats. The normally open contact is connected directly to the water heater zone valve
motor.
As long as the water heater is not calling for heat, power is supplied to all space heating
thermostats and a call from any space heating thermostat will energize that zone's zone valve
and bring on the boiler. As soon as the water heater calls for heat, however, the normally closed
contacts open, which supply all power to the space heating thermostats, de-energizing the
heating zones and closing any open space heating zone valves. At the same time, the normally
open contacts in the R8285B become made which energizes the water heater zone valve. The
water heater zone valve opens and its ends switch brings on the boiler.
If three (3) or more zones (including the water heater zone) are present use an external 24v
transformer.
Zone Valves (3 Way Priority)
Figure 15 shows a connection diagram for a Honeywell 3-way zone valve. This valve is equipped
with 4 connections, 2 of which are for a 24 volt motor and 2 of which are end switch connections
which make when the valve is open.
As long as the water heater is not calling for heat, a call from the space heating thermostat will start
the boiler and water will circulate to the space heating zone through the normally open
zone valve (see the piping section for more information on this). If the water heater thermostat calls
for heat, however, the zone valve motor is energized and boiler water is redirected through the
water heater's tank regardless of the status of the space heating thermostat.
Manifold Wiring
Wiring for manifolded water heaters is identical to the wiring for a single water heater except for the
presence of more than one tank aquastat.
If unions and isolation valves -are present so that any tank could be pulled from the manifold
without shutting down the entire tank zone, install all the aquastats provided and wire them in
parallel. In this way, any tank can be completely removed from the manifold while allowing
operation of the other water heaters.
Wiring notes:
1) These are some typical examples not the only possibilities.
2) Many types and brands of priority and non priority zone valve and zone pump controllers are
available which may be used. Follow control manufacturers instructions.
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