User Guide

Part number 550-100-193/0817
– 27 –
®
CONDENSING GAS BOILER — 70/110/155 Advanced Manual
Field wiring (see wiring diagram, Figure 15, page 34)
A. 120 VAC Power Supply – REQUIRED
Terminal Block P1
1. Provide and install a properly-sized, fused disconnect or service
switch as required by applicable codes. (15-amp for most cases.)
a. Use table at right to determine total load.
2. Connect properly sized
120 VAC power wiring to Evergreen
®
boiler line voltage terminal strip P1 as shown at right.
3. If possible, provide a surge suppressor in the supply power
line. This will reduce the possibilities of control damage due
to line surges.
4. Must wire ground to this terminal to provide boiler grounding.
Determine total load
Boiler & boiler pump
(combined load)
Output 1 . . . . . . .
(2.0 amps max)
Output 2 . . . . . . .
(2.0 amps max)
Output 3 . . . . . . .
(2.0 amps max)
TOTAL . . . . . . .
5.6 amps
____ amps
____ amps
____ amps
____ amps
See Figure 15, page 34 for
details
B. 120 VAC Outputs 1, 2 & 3 – On each boiler – As needed for systems
Terminal Strip P2 (EVG control module)
1. Output 1: P2 Terminals 1 (H), 4 (N), 7 (G).
2. Output 2: P2 Terminals 2 (H), 5 (N), 8 (G).
3. Output 3: P2 Terminals 3 (H), 6 (N), 9 (G).
4. Maximum load: 2.2 amps (use relay if circulator load is higher). See WARN-
ING below.
5. Each boiler has three outputs (Output 1, Output 2, and Output 3) that provide
120 VAC to the following listed below.
s A zone
circulator.
s A system circulator.
s A DHW circulator (used to circulate through an indirect tank).
s An auxil
iary item that must be energized during an input call, such as
an air damper.
6. When using inputs/outputs for heat/DHW demands, each input (Input 1,
Input 2, and Input 3) controls its respective 120 VAC output (Output 1,
Output 2, and Output 3). Outputs are energized only when BOTH condi-
tions below are met:
a. The corresponding input indicates a call for heat/DHW (i.e., contact
closure).
b. The PRIORITY assigned to the Input/Output pair is ACTIVE (i.e., the
zone may be calling but the pump won’t activate unless the boiler is cur-
rently running on that system/priority).
7. When using the inputs/outputs for the AUX PUMP/OUTPUT function, the
output is controlled by selectable conditions set up in the control.
a. Use the AUX PUMP/OUTPUT function for devices such as system pumps,
combustion air dampers, and other auxiliary equipment to activate when
the boiler is on/running.
b. See page 56 and page 57 for more information on the setup and selection
of operating conditions.
For Priority DHW Application:
The DHW aquastat(s) and pumps can be connected to any one of
the three input/output pairs.
The selected input should be assigned to LOCAL or P1 if single,
PRIORITY 1 if direct piped to the boiler, or NETWORK PRIOR-
ITY 1 if located in the system. Set the assignment during the WIZ-
ARD setup or manually in the ASSIGN INPUTS menu.
See Figure 15, page 34 for details
Output circuits are 120 VAC. If an
output is to operate a low voltage
circuit or must be an isolated con-
tact, use an isolation relay. See
example above for 24 VAC zone
valves.
CIRCULATOR POWER — The maximum allow-
able current for each circulator is 2.2 amps
at 120 VAC
.
For circulators with higher amp ratings, install a circulator relay
or starter. Connect only the 120 VAC coil to the Evergreen®
circulator terminals.