Weil-McLain SlimFit 2 Series Manual page 46

™
SlimFit
COMMERCIAL CONDENSING GAS
Field wiring
A. 120 VAC Power Supply –
(control panel, left side)
1. Boiler line voltage power — Boiler load is 18 amps. Provide and install a
fused disconnect or service switch (25- or 30-ampere rated recommended) as
required by applicable codes.
2. Connect properly sized
terminal strip 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.
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.
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 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 69 and page 70 for more information on the setup and selection
of operating conditions.
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.
.
46
-
FIRED WATER BOILER
REQUIRED
power wiring to SlimFit boiler line voltage
– On each boiler –
(SlimFit control module, right side)
:
—
—
Boiler Manual Series 2
(continued)
See Figure 50, page 54 for details
As needed for systems
See Figure 50, page 54 for details
For circulators with higher amp ratings, install a circulator
relay or starter. Connect only the 120 VAC coil to the
circulator terminals.
Output circuits are 120 VAC. If an
output is to operate a low voltage cir-
cuit or must be an isolated contact,
use an isolation relay. See example
above for 24 VAC zone valves.
SlimFit
Part number 550-100-162/0815