Dunkirk ARTESIAN 220, Инструкция по установке и эксплуатации

Страница: 33 / 40

VII. Wiring
The following applies to all wiring:
1) Wiring must be done in accordance with all codes. In the absence of any codes, the
system must be wired in accordance with the National Electric Code (ANSI/NFPA 70-latest
revision).
2) The entire system (boiler controls, water heater and heating zone controls) must be on its
own circuit. The current rating of this circuit will depend on the total number and size for
loads in the system. However, it should in no case be less than 15 AMPS.
3) The water heater is equipped with a Honeywell L4080B-1378 series aquastat. This aquastat
has an operating range of 100"F to 200°F with a 15° differential. The switch contacts will
open at the aquastat set point and close at the set point minus the differential.
Circulator Zone Wiring (Non Priority)
Figure 14 is a connection diagram for a non-priority circulator zone system using Honeywell
R845A's. The R845A is equipped with two sets of contacts (3,4 and 5,6) which become made
when the T and T terminals are made. Terminals 1 and 2 on the R845A are supplied with 110
VAC to power its internal transformer. In this application, one R845A is provided for each zone,
including that of the water heater. If the boiler has a factory equipped circulator, this is
disconnected from terminals C1 and C2 on the boiler control.
When any thermostat (including the thermostat on the water heater) calls for heat, the relay
in the R845A for that zone becomes energized. Terminals 3 and 4 become made, energizing
the circulator. Terminals 5 and 6 are also made which start the boiler.
Circulator Zone Wiring (Priority)
Figure 16 is a connections diagram for priority circulator zoning. This system is similar to non-
priority circulator zoning except that a Honeywell R8285B relay is used in place of the R845A on
the water heater zone. This relay is equipped with its own 24 volt transformer and D.P. D.T
contacts. The water heater control is connected to terminals R and G so that when the water
heater control calls for heat, the relay is energized.
One set of contacts on the R8285B is used to switch line voltage. On this set of contacts, the
common is connected to an unswitched "hot". The normally closed contact is connected to
terminal #1 on each of the space heating zone's R845A's. The normally open contact is
connected to the water heater zone circulator. The normally closed contact on the other set of
R8285B contacts is not used. The common and normally open contacts are connected in
parallel with terminals #5 and #6 on the space heating zone R845A's.
As long as the water heater zone does not call for heat, the R845A's for the heating zones have
110 VAC across their 1 and 2 terminals and the heating zones will function as described in the
non-priority circulator zone section. As soon as the water heater calls for heat, however, the
normally closed terminals in the R8285B open, de-energizing the heating zones and energizing
the water heater circulator. The other set of contacts in the R8285B (connected across the boiler
thermostat connections) make which brings on the boiler.
Zone Valves (Non-Priority)
Figure 18 shows a connection diagram for a zone system using Honeywell V8043F motorized
zone valves. The motor on these valves is connected between TH and TR. TH/TR is provided for
the electrician's convenience as a binding post and is connected to nothing inside the valve. The
end switch terminals are connected to a set of switch contacts inside the valve, which make
when the valve is open.
A call for heat from any thermostat or the water heater's aquastat results in the application of 24
volts across the motor in that zone's zone valve. This drives open the zone valve. When the valve
has opened, the end switch in that zone valve makes and brings on the boiler.
Page 33