User Guide

Zoning with the EVG Control (continued)
C. Zoning with ZONE VALVES, multiple boilers, suggested applications
(see EVG Boiler Manual for single boiler suggested applications)
Multiple space heating zones with direct-piped DHW on one or more boilers (optional)
This suggested application only applies
to systems with DHW piped directly to
individual boilers. For systems with DHW
connected to the system other control ar-
rangements may be required.
1. Review wiring information on page 27 (120 VAC
outputs) and page 28 (24 VAC inputs).
2. The configurations at right use the three input/out-
put pairs of each boiler (except INPUT/OUTPUT 1
on the boiler wired for system circulator) to receive
thermostat (or DHW aquastat) inputs on P11-4/5,
P15-1/2, and P15-3/4. The space heating system
circulator is connected to OUTPUT 1 (terminals 1,
4, and 7 on P2).
3. Assign as many available input/output pairs in the
network as needed for zoning.
4. Setting the controls for network space heating zones:
a. Recommended — assign the space heating input/
outputs to NETWORK PRIORITY 2. The factory
settings default to space heating, reducing the
changes needed to set up the controls.
b. Choose the space heating system type that
matches the heating system during the WIZARD
setup or manually in the NETWORK PRIOR-
ITY 2 menu.
c. Use the factory default settings for the system
type chosen, or change if needed.
5. On the boiler that is used for system circulator, as-
sign INPUT 1 to AUX PUMP/ OUTPUT. Then select
ANY INPUT BY ITS PRIORITY when prompted
for when to activate the output. This will cause the
system pump to run when any of the space heating
zones calls for heat.
6. Setting the controls for individual boiler DHW
loads:
a. Assign the INPUT that is wired to the DHW
aquastat to LOCAL PRIORITY 1, which defaults
to settings for DHW.
b. Verify that settings are acceptable. Change if
needed.
7. On the boiler that is used for system circulator,
Input 1 cannot be used for a wired connection (as
shown in the top right diagram.)
8. Factory defaults should work for other settings not
listed above.
9. Wire 24 VAC zone valves as shown below:
P15, P11, and P2 are terminal strips on the EVG control
(See wiring at left for 24 VAC zone valves).
®
CONDENSING GAS BOILER — 70/110/155 Advanced Manual
Part number 550-100-193/0817
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