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Weil-McLain SERIES 7 PFG Control Supplement

Weil-McLain SERIES 7 PFG Control Supplement

Series 7 gas-fired water boiler
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PFG
Control Supplement
Universal Control Systems (UCS)
Controls must only be installed by and Control Supplement used by a qualified
installer/service technician. Read all instructions before installing. Failure to
follow all instructions in proper order can cause severe personal injury, death
or substantial property damage.
Gas-fired
water boiler
Series 7
To complete boiler installation,
follow:
• General Information
• Boiler Wiring
• Vent Damper Installation
• Check-out Procedure
• Operating Instructions 8-10
For additional help, see:
• Troubleshooting
• Parts List
Part No. 550-110-643/0605
2
3-5
6
7
11-15
16

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Summary of Contents for Weil-McLain SERIES 7 PFG

  • Page 1 Control Supplement Universal Control Systems (UCS) Controls must only be installed by and Control Supplement used by a qualified installer/service technician. Read all instructions before installing. Failure to follow all instructions in proper order can cause severe personal injury, death or substantial property damage.

  • Page 2: General Information

    PFG S erieS – U Fired ater oiler niverSal GENERAL INFORMATION: This system is used on natural gas-fired boilers with or without dampers as shipped from the factory. This system is not offered for retrofit, or conversion from standing pilot systems.

  • Page 3: Section A: Installation

    PFG S – U erieS Fired ater oiler niverSal ontrol yStemS Section A: Installation 1. Bring supply wiring to boiler. Must be 14 ga. or heavier. See pages listed below each Figure for appropriate wiring diagram. 2. Proceed to page 6. PFG 5 Boiler PFG 6 thru 8 Boilers Figure 1,...
  • Page 4 PFG S – U erieS Fired ater oiler niverSal ontrol yStemS Part Number 550-110-643/0605...
  • Page 5 PFG S – U erieS Fired ater oiler niverSal ontrol yStemS Part Number 550-110-643/0605...

  • Page 6: Section B: Damper Installation

    This will void C.S.A. certification and will not be covered by Weil-McLain warranty. Any changes will cause severe personal injury, death or substantial property damage. 4. PFG - Damper must be installed directly on top of draft hood so that it serves only one boiler and so that damper blade indicator is visible to homeowner.

  • Page 7: Section C: Check-Out

    PFG S erieS Fired ater 1. See Figure 5 for operating instructions page numbers. Raise room thermostat to call for heat. Damper actuator will slowly open damper (if provided). 2. When damper (if provided) is fully open, ignition control powers spark generator and opens pilot valve. Damper must be in open position when appliance main burners are operating.
  • Page 8 PFG S – U erieS Fired ater oiler niverSal ontrol yStemS PFG-5 WITH HONEYWELL VR820/VR830 GAS VALVE Part Number 550-110-643/0605...
  • Page 9 PFG S – U erieS Fired ater oiler niverSal ontrol yStemS PFG-5 WITH WHITE-RODGERS 36C GAS VALVE Part Number 550-110-643/0605...
  • Page 10 PFG S – U erieS Fired ater oiler niverSal ontrol yStemS PFG 6-8 WITH ROBERTSHAW 7000 DERHC GAS VALVE Part Number 550-110-643/0605...

  • Page 11: Section D: Troubleshooting

    PFG S erieS Fired ater VERIFY PROPER OPERATION AFTER SERVICING Never jumper (bypass) any device except for momentary testing as outlined in Troubleshooting Charts. Substantial property damage and/or severe personal injury could occur. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
  • Page 12 PFG S TABLE I: No Spark, System Does Not Work Correct by making connections. Check for open thermostat or circ. relay (where used) or check for loose wire connections, defective spill switch or rollout thermal fuse element, or open LWCO or limit contacts. If LWCO, spill switch or rollout thermal fuse element contacts are open, determine cause...
  • Page 13 PFG S erieS Fired ater Secure connections. Check for loose wire connections or bad relay on transformer. Check for open thermostat or circ. relay (where used) or check for loose wire connections, defective spill switch or rollout thermal fuse element, or open LWCO or hight limit contacts. If LWCO, spill switch or rollout thermal fuse element contacts are open, determine cause and correct condition.
  • Page 14 TABLE III: Pilot Lights, Main Valve Will Not Come On Does spark stay on for more than a few seconds after pilot is established? Is 24VAC between Terminals MV and MV/PV on ignition control? Replace ignition control. Is inlet gas pressure at least 5.0"W.C.
  • Page 15 PFG S erieS Fired ater TO CHECK IGNITION SYSTEM GROUNDING FOR TABLE III, PAGE 14. Pilot assembly and ignition control must share common ground with main burner. Nuisance shutdowns are often caused by poor or erratic ground. • Check for good metal-to-metal contact between pilot burner bracket and main burner, and between main burner and burner rest.

  • Page 16: Section E: Parts

    Effikal RVGP-KS-9BF** Johnson Q35GM-2 consisting of M35BC actuator and Y15 vent pipe** Effikal RVGP (Effikal Only) Johnson M35BE-1C (Johnson Only) Weil-McLain Honeywell S8620C1003 United Technologies 1003-511 Johnson Controls Q90GE-1 consisting of J981LYW pilot and Y75AA-3 flame sensor Weil-McLain Weil-McLain...

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