Crown Boiler Mega-Stor Operations Instructions download pdf (Page 21)

VIII. 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/ZFPA 70-1990).

2) The Mega-Stor is equipped with Honeywell L4006A series temperature control. This control has a set of contacts

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CIRC ZONE WIRING (NON PRIORITY)

Figure 8.1 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 110 VAC to power its internal transformer. In this application one R845A is provided for each zone

including that of the Mega-Stor. If the boiler has a factory equipped circulator, this is disconnected from terminals Cl and C2 on

the boiler.

When any thermostat (including the thermostat on the Mega-Stor) 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 8.1: CIRC. ZONE WIRING (NON-PRIORITY)

USING HONEYWELL R845’S

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Crown Boiler Mega-Stor Operations Instructions Page 21