Crown Mega-Stor 2 Installation Manual

15
VI. WIRING
The following general notes apply 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).
2) The indirect water heater (IWH) is equipped with Honeywell a L4080B series temperature control. This control has a
 setofcontactswhichmakeuponacallfordomesticwaterandbreakwhenthistemperatureissatised.
A. BASIC CIRCULATOR ZONE WIRING
Figure 6.1 is a connections 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 120 VAC to power its internal transformer. In this application one R845A is provided for each zone
including that of the IWH.
When any thermostat (including the thermostat on the IWH 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.
FIGURE 6.1: CIRC. ZONE WIRING (NON-PRIORITY)
USING HONEYWELL R845’S