Weil-McLain Evergreen EVG 70 Manual page 56

®
g
Field wiring
A. 120 VAC Power Supply –
Terminal Strip P1 (EVG control module)
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 block 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.
B. 120 VAC Outputs 1, 2 & 3 –
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
WARNING below.
5. These three outputs (Output 1, Output 2, and Output 3) can provide 120VAC
to the following listed below.
• A zone circulator.
• A system circulator.
• A DHW circulator (used to circulate through an indirect tank).
• An auxiliary 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 120VAC output (Output 1,
Output 2, and Output 3). Outputs are energized only when BOTH conditions
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 currently
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 82 and page 83 for more information on the setup and selection
of operating conditions.
For Priority DHW Application
The DHW aquastat can be connected to any one of the three input/
output pairs. The selected input should be assigned to PRIORITY 1
during the WIZARD setup or manually in the ASSIGN INPUTS
menu.
CIRCULATOR POWER
allowable current for each circulator is 2.2
amps at 120 VAC
56
as-fired water boiler —
(see wiring diagram, Figure 60, page 62 ) (continued)
REQUIRE D
As needed for systems
:
— The maximum
.
Boiler Manual
70/110/155
Determine total load
Boiler & boiler pump 5.6 amps
(combined load)
____ amps
Output 1 . . . . . . .
(2.2 amps max)
____ amps
Output 2 . . . . . . .
(2.2 amps max)
____ amps
Output 3 . . . . . . .
(2.2 amps max)
____ amps
TOTAL . . . . . . .
See Figure 60, page 62 for details.
For circulators with higher amp ratings, install a circulator
relay or starter. Connect only the 120VAC coil to the Evergreen
circulator terminals.
See Figure 60, page 62 for details
Output circuits are 120 VAC.
If an output is to operate a
low voltage circuit or must be
an isolated contact, use an
isolation relay.
Part number 550-100-191/0917