WEIL-McLAIN Series 2 Wall Mount Gas-Fired Instructions

WEIL-McLAIN Series 2 Wall Mount Gas-Fired

Multi-Boiler Wiring Kit Instructions

STOP! Read before proceeding

Hazard definitions
The following defined terms are used throughout this instruction to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

• Indicates presence of hazards that will cause severe personal injury, death or substantial property damage.
• Indicates presence of hazards that can cause severe personal injury, death or substantial property damage.
• Indicates presence of hazards that will or can cause minor personal injury or property damage.
• Indicates special instructions on installation, operation or maintenance that are important but not related to personal injury or property damage.
• These instructions must only be used by a qualified installer/service technician. Read all Instructions completely before beginning the installation. Failure to follow all instructions can cause severe personal injury, death or substantial property damage.
• Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury (exposure to hazardous materials) or loss of life. Refer to the user’s information manual provided with this boiler or available online at Weil-McLain.com. Installation and service must be performed by a qualified installer, service agency or the gas supplier (who must read and follow the supplied instructions before installing, servicing, or re-moving this boiler. This boiler contains ceramic fiber and fiberglass materials that have been identified as carcinogenic, or possibly carcinogenic, to humans).

P/N 383-700-272 Kit Contents:

Recommended tools

Phillips screwdriver

Flat blade screwdriver
Paper/pen
Boiler manual

Before proceeding:

1. Shut down the power to the boiler.
   Shut off power to the boiler. Failure to do so can result in severe personal injury, death or substantial property damage.

2. Remove door by disengaging the two (2) latches at the sides of the front door.

3. Slightly lift and pull the door away from the boiler to remove.

4. Remove two (2) Phillips head screws that hold control tray cover plate in place. Lift and pull cover away from tray. Set control tray cover to side.

Label wires before removing
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Mounting the Junction Box

1. Measure and mark the mounting location, using the harness length as a reference. Ensure some slack to avoid stressing the wiring.
2. Install the junction box to a nearby surface using the four supplied screws through the holes in the junction box sides.
3. For drywall installations, use the included drywall an-chors for mounting the junction box.

Installing Harness

1. Route the 5-pin side of the supplied harness through the low voltage knockout on the bottom of the boiler cabinet, indicated as “A” in Figure 3 on page 3.
2. The harness should route behind the control mounting bracket, indicated as “B” in Figure 3 on page 3.
3. Route the harness through the large opening on the top right of the control mounting bracket (“C” in Figure 3 on page 3). Make connection to boiler control board “D” in Figure 3 on page 3.
4. Press the mounting clip through the hole in the right side of the control mounting bracket at approximate location indicated by “B” in Figure 3 on page 3.
5. Firmly insert the grommet, supplied on the harness, into the knockout in the bottom of the boiler cabinet.
6. Connect the Ethernet side of the harness into the circuit board in the junction box. Firmly install the grommet.

Figure 3 5-pin Wire Routing

Wiring BMS/Multi-Boiler

Connector J12

1. Wiring for RS485 communication harness endpoint circuit board is as follows:

   • JP4-1 = A2 (RS485 Multi-boiler Bus A+)
   • JP4-2 = B2 (RS485 Multi-boiler Bus B-)
   • JP4-3 = GND (RS485 Multi-boiler Bus GND)
   • JP4-4 = A3 (RS485 Multi-boiler Bus A+)
   • JP4-5 = B3 (RS485 Multi-boiler Bus B-)
   • JP4-6 = GND (RS485 Multi-boiler Bus GND)
   • JP4-7 = GND (BMS Ground)
   • JP4-8 = BMS B (BMS B-)
   • JP4-9 = BMS A (BMS A+)

2. Boiler to boiler wiring connections (see wiring at right)

   • Use shielded 3-wire cable. Do not exceed 1,000 feet length.
   • Connect 3-wire cable between Boiler-to-Boiler OUT (JP4-GND, B2, A2) on one boiler to Boiler-to-Boiler IN (JP4-GND, B3, A3) on the next boiler.
   • Continue this wiring until all boilers are interconnected.
     NOTICE: DO NOT return last shadow’s wires to Master’s A3/B3/GND ports! This will create a communication loop, which will cause duplication of information and clashes in communication. The result is undesired and unknown behavior, up to and including complete loss of communication.

3. For applications using only BMS, use the wiring har-ness supplied with the boiler (and also sold separately, P/N 383-700-401). Remove pre-cut insulation on the har-ness and use wire nuts to tie in field wiring. BMS harness leads are as follows:

   • J12-1 = BMS A+
   • J12-2 = BMS B-
   • J12-5 = BMS Ground

4. MODBUS to BMS

   • The control is equipped with MODBUS communication to communicate with a BMS.
   • Use terminal JP4 (JP4-BMS A+, BMS B-, GND) to wire to the BMS control.
   • If the BMS uses BACnet protocol, install a BACnet converter between the BMS and the ECO Tec MOD-BUS-to-BMS terminals on JP4.

5. Navigate to the Modbus Setting screen on the display. This is accessed via the contractor menu by pressing and holding the WM Logo from the home screen.

6. Adjust all necessary Modbus settings to match the BMS system being utilized.

7. Install the junction boxfront panel using the supplied screws.

WARNING : Reinstall control bracket front panel and boiler door after start-up or servicing. The door must be securely fastened to the boiler to prevent the boiler from drawing air from inside the boiler room.

Weil-McLain
500 Blaine Street Michigan City, IN 4360-2388 weil-mclain.com

References

• Weil-McLain | Advancing Hydronic Heating Since 1881

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