User Guide

®
CONDENSING GAS BOILER — 70/110/155 Advanced Manual
Part number 550-100-193/0817
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Field wiring (see wiring diagram, Figure 15, page 34)(continued)
C. 120 VAC to Boiler Circulator – REQUIRED
Terminal Strip P4 on Comm Board
1. Provides 120 VAC to the boiler circulator at P4 Terminal to Control module.
2. Terminals are: 1 (H), 2 (N), 3 (G).
3. Maximum load: 2.0 amps (use relay if circulator load is higher). See WARN-
ING.
4. The boiler circulator (shipped loose with boiler) is used in the boiler loop of
the primary / secondary piping. Primary / secondary piping is required to
be used with the Evergreen® boiler to ensure proper flow through the heat
exchanger.
See Figure 15, page 34 for details
D. 24 VAC Inputs 1, 2 and 3 (tstats, end switches, etc.) – As needed for systems
Terminal Strip P11 (input 1) & Terminal Strip P15 (inputs 2 & 3) (EVG control module)
1. Input 1 – Terminal Strip P11 – 4 & 5 (EVG control module)
2. Input 2 – Terminal Strip P15 – 1 & 2 (EVG control module)
3. Input 3 – Terminal Strip P15 – 3 & 4 (EVG control module)
4. These three inputs on each boiler can indicate a call for heat to the control
by means of a dry contact closure (thermostat, aqua stat, or switch). (See
right and Figure 15, page 34).
5. Each control provides input/output pairs for up to three zones or three systems
(priorities). For multiple boiler applications, this is true for each boiler (for
eight boilers, total is 3 x 8 or 24).
6. For DHW applications, the aquastat can be connected to one of the three
input/output pairs. Wire the DHW circulator to the corresponding output.
a. For minimum setup steps, take advantage of the factory default settings.
Use LOCAL PRIORITY 1 for the DHW circuit if piped directly to the
boiler, or NETWORK PRIORITY 1 if the DHW circuit is located in the
system as a zone.
b. For DHW circuits piped as a zone in a system with a system pump, setup
the control to run AUX PUMP/ OUTPUT during DHW operation. This
can be done during the WIZARD setup process. Note that the input used
for AUX PUMP/OUTPUT cannot be used to accept a heat input.
DHW circuit in system — For high-demand DHW circuits, the con-
trol setting for MIN BOILERS must be set using the NETWORK 1
or NETWORK 2 priority menu after the WIZARD is completed
to ensure quick response to demand. See page 53 for a description
of the MIN BOILERS setting.
7. The default control setting uses each input (INPUT 1, INPUT 2, and IN-
PUT 3) to control its respective 120 VAC output (OUTPUT 1, OUTPUT 2,
and OUTPUT 3).
Use of 0–10VDC input for modulation disables INPUT 1 from
creating calls for heat. This function can only be set up on single
boilers. See page 32 for instructions.
See Figure 15, page 34 for details
Thermostats — DO NOT supply 24-volt power to the thermostat
circuits (Input1, Input2 and Input3 in Figure 15, page 34 ) or
attempt to supply 24 volts for any other application.
For thermostats that require a continuous 24-volt power
source, connect the common wire (“C”) to
P11 Pin 2 (see Fig-
ure 15, page 34)
. Do NOT exceed total amp draw per thermostat.
Zone valves — If using 3-wire zone valves, use
relays to provide dry contacts to the Control ther-
mostat connections. The zone valve end switches
of 3-wire valves carry 24 VAC from the valve.
Thermostat anticipator setting — 0.1 amps.