Weil-McLain Evergreen EVG 220 Manual page 53

®
gas
Field wiring
A. 120 VAC Power Supply –
Terminal Block T1 (control tray, right front)
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. Suggested
fused disconnect or service switch sizing is 15-amp if
total load is 12 amps or less, 20-amp if total load is more
than 12 amps.
120 VAC
2. Connect properly sized
boiler line voltage terminal strip T1 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 ground-
ing.
B. 120 VAC Outputs 1, 2 & 3 –
Terminal Strip P2 (EVG control module, right side)
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. 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, Out-
put 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 78 and page 79 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
able current for each circulator is 2.2 amps
at 120 VAC
.
Part number 550-100-131/0120
-
fired water boiler
(see wiring diagram, Figure 65, page 59)(continued)
REQUIRED
power wiring to Evergreen
As needed for systems
:
The maximum allow-
—
— 220/299/300/399 Boiler Manual
Determine total load
Boiler & boiler pump
8.4 amps
(combined load)
Output 1 . . . . . . .
____ amps
(2.2 amps max)
Output 2 . . . . . . . ____ amps
®
(2.2 amps max)
Output 3 . . . . . . . ____ amps
(2.2 amps max)
____ amps
TOTAL . . . . . . .
For circulators with higher amp ratings, install a circulator re-
lay or starter. Connect only the 120-VAC coil to the Evergreen
circulator terminals.
See Figure 65, page 59 for details
See Figure 65, page 59 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 isola-
tion relay.
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