AQUA PLUS
Boiler-side wiring and controls
Electrical shock hazard — Can cause severe personal injury, death or substantial property damage. Disconnect power before installing and / or servicing.
Wiring requirements
1.All wiring must be a minimum of 18 gauge and installed in accordance with:
•U.S.A. — National Electrical Code and any other national, state or local code requirements having jurisdiction.
•Canada — CSA C22.1 Canadian Electrical Code Part 1 and any other national, provincial and local code requirements having jurisdiction.
2.If original wire as supplied with appliance must be replaced, Type 90° C or its equivalent must be used.
3.Refer to control component instructions packed with boiler for ap- plication information.
4.An optional service switch may be installed in water heater electri- cal circuit. This switch would only shut off the water heater, not the home heating system. Do not shut off water heater if there is a chance of freezing.
5.All electrical contacts are shown with no power applied —
Circulators
1. Size priority relay for total amp draw of all circulators.
Zone Valves
1. Size transformer for maximum load of all zone valves.
Wiring to the water heater
1.Field connections to the water heater thermostat are for 24 VAC only, connecting to the
Wiring options
1.This manual shows wiring only for use of
2.Other wiring methods may be acceptable and are left to the installer.
Use domestic priority
1.When possible, set controls to provide domestic priority — that is, on a call for domestic water the control switches from space heating to DHW only.
2.Domestic priority ensures the fastest possible re- sponse to the DHW call for heat.
3.The smaller the water heater, the greater the need for rapid response.
Figure 17 Inspection hatch assembly (hatch cover shown transparent)
1Temperature adjustment knob
2Inspection plate (handhole)
3Factory wires from thermostat to field wiring terminal block
4Field wiring terminal block
5M8 hex nut
6Inspection plate bracket
20 | Part number |
