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Weil-McLain WMB-155C Manual

Aquabalance wall mount gas-fired combination boiler – heating and domestic hot water
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Aqua Balance
Combination Boiler – Heating and Domestic Hot Water
This manual must only be used by a qualified heating installer/service technician. Failure to comply could result in
severe personal injury, death or substantial property damage.
When calling or writing about the boiler— Please have boiler model number from the boiler rating label.
Wall Mount Gas-Fired
Boiler Manual
• Installation
• Maintenance
• Startup
• Parts
Quick Start Guide
Pages 3 & 4
Part number 550-100-305/1016
WMB-155C

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Summary of Contents for Weil-McLain WMB-155C

  • Page 1 Aqua Balance WMB-155C Wall Mount Gas-Fired Combination Boiler – Heating and Domestic Hot Water Boiler Manual • Installation • Maintenance • Startup • Parts Quick Start Guide Pages 3 & 4 This manual must only be used by a qualified heating installer/service technician. Failure to comply could result in severe personal injury, death or substantial property damage.

  • Page 2: Table Of Contents

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual Contents 21 Field wiring..... . . 46 1 Quick Start Guide — using default settings ..3 23 Wiring diagram —...

  • Page 3: Quick Start Guide - Using Default Settings

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual Quick Start Guide — using default settings Figure 1 50-55 QUICK START GUIDE After you have completed the installation of the Boiler Combi model by the instructions provided in the manual, pages 5-71 insure the following first before you proceed: All gas lines are connected and tested for leaks, and if the boiler is to operate on LP fuel, and the unit has been converted properly from Natural gas to Liquefied Petroleum (Propane) gas and set up as directed in the boiler...
  • Page 4 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual Quick Start Guide — using default settings QUICK START GUIDE System start (continued) “Test Mode Operation” Proceed to put the boiler into operation as follows: 1. To start, create a demand for heat, open up a hot water faucet or turn up the thermostat. 2.

  • Page 5: Please Read Before Proceeding

    See the instructions at right. contact with water, replace the boiler with a new Weil-McLain boiler. Failure to adhere to the guidelines below can result in severe personal injury, death or substantial property damage.

  • Page 6: Prepare Boiler Location

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 2 Prepare boiler location Codes and Checklists: Provide air openings to room Installations must comply with: Boiler alone in boiler room Local, state, provincial, and national codes, laws, regulations 1.
  • Page 7 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 2 Prepare boiler location continued Clearances A Provide combustion air/ventilation openings per Figure 24, page 22 or as otherwise directed in this manual or by applicable codes. If the installation does not provide the minimum clearances, Provide clearances from then the enclosure MUST HAVE air openings located per Figure 2, combustible materials —...

  • Page 8: Prepare Boiler

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 2 Prepare boiler location continued Air contamination air intake Install air inlet piping for the boiler as described in Please review the following information on potential combustion this manual. air contamination problems.
  • Page 9 4. Level the bracket and trace the outline of the screw slots with a pencil. The operating weight for wall-mountable boiler is: WMB-155C Figure 4 Failure to comply with above and the procedure given below could result in severe personal injury, death or substantial property damage.

  • Page 10: Hydrostatic Pressure Test

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 3 Prepare boiler continued Hydrostatic pressure test Fill and pressure test 1. See Figure 6, page 11, for use with the following instructions. 2. CLOSE the boiler drain valve (item 10). Connect a hose to mum allowable relief valve setting for the fresh water supply and to the drain valve.
  • Page 11 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 3 Prepare boiler continued Figure 6 Figure 7 see legend below) (see legend below) 1. Boiler Supply (outlet) connection, (male, 1”NPT ). 2. Boiler Return (inlet) connection, (male, 1”NPT). Recommend Near Boiler Piping to be 1-1/4”...

  • Page 12: Converting Boiler To Propane

    Converting an existing natural gas- Label Gas Conversion — For a boiler Label WMB-155C Rating Plate Conversion LP already installed, you must turn off gas supply, turn off power and allow boiler to cool before Instructions Conversion Natural to LP Gas proceeding.
  • Page 13 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 4 Converting boiler to propane continued Figure 10 1. Contact propane gas supplier to size piping, tank and in- stall a 100% lockup gas pressure regulator, or to verify size and condition of existing piping and equipment.
  • Page 14 Figure 16 4. Remove three (3) Hex head screws holding the venturi, Item 5 in place, remove venturi, replace with new propane venturi from kit. Verify the venturi label information matches the boiler size WMB-155C, (Propane venturi has Part number 550-100-305/1016...
  • Page 15 Press the Heating (+) button to scroll to Parameter “b04”. e. Press DHW (-) to reduce the Maximum Blower Speed, from 205 to 200 for the WMB-155C boiler, see Figure 103, page 82. f. Press the (+) button to scroll to Parameter “b05”.

  • Page 16: Gas Piping - Sizing Gas Lines

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 5 Gas piping — sizing gas lines Boiler gas connection is ½” NPT. Size gas lines large Figure 19 enough to provide gas to all connected appliances. Natural Gas: total 1.

  • Page 17: Venting/Air Piping - General

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 6 Venting/air piping — general mon venting system. Turn on any exhaust fans, such as Any improper operation of the common venting system should range hoods and bathroom exhausts, so they will operate at maximum speed.
  • Page 18 Fig. 21, page 19 PVC/PVC-DWV PVC/PVC-DWV PVC/PVC-DWV PVC/PVC-DWV CPVC, WMB-155C CPVC, PP, SS CPVC, PP, SS CPVC, PP, SS PP, SS Equivalent feet for elbows (USE SWEEP ELBOWS ONLY) — deduct from max equivalent length of piping (does not apply to termination fittings) If using stainless pipe, provide adapters for terminations, if required.
  • Page 19 BIRD SCREEN at each termination the bird screens. Purchase bird screens separately from Weil-McLain or vent kit supplier if not included. [Note — bird screening is integral to the 3" PVC Weil-McLain sidewall vent cap, available for purchase from Weil-McLain.

  • Page 20: Commonwealth Of Massachusetts Installations

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 7 Commonwealth of Massachusetts installations Commonwealth of Massachusetts — (a) For all sidewall horizontally-vented gas-fueled equipment . The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall installed in every dwelling, building or structure used in not approve the installation unless, upon inspection, whole or in part for residential purposes, including those...

  • Page 21: Vent Termination Requirements

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 8 Vent termination requirements The vent termination must be located to meet all requirements below (also applies to vertical vent terminations). The minimum distance Figure 23 from adjacent public walkways, adjacent buildings, openable windows and building in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or the Natural Gas and Propane Installation Code, CAN/CSA B149.1.

  • Page 22: Boiler Room Air Openings

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 9 Boiler room air openings Figure 24 The boiler CANNOT be in the same space with other appliances if clearances around the are less than the recom- mended service clearances shown in Figure 2, page 7. Air openings Boiler Boiler...

  • Page 23: Direct Vent - Sidewall With Separate Pipes

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 10 DIRECT VENT — Sidewall with separate pipes Figure 25 Allowable vent/air pipe materials & lengths Use only the vent materials and kits listed in Figure 22, page 19. Provide pipe adapters if specified. 1.
  • Page 24 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 10 DIRECT VENT — Sidewall with separate pipes continued Figure 26 See notices on previous page. a. Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole at least 0.4”...

  • Page 25: Direct Vent - Sidewall Concentric

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 11 DIRECT VENT — Sidewall concentric Figure 28 Allowable vent/air pipe materials & lengths 1. The concentric termination kit must be purchased separately. Use only the vent materials and kits listed in Figure 22, page 19.
  • Page 26 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 11 DIRECT VENT — (continued) Figure 29 See notices on previous page. Install termination — concentric pipes 1. Assemble the vent termination as described for concentric termi- nations, on page 31. If necessary, you can shorten the lengths of the inner and outer pipes for a shorter finished assembly.

  • Page 27: Direct Vent - Vertical With Separate Pipes

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 12 DIRECT VENT — Allowable vent/air pipe materials Figure 31 & lengths Use only the vent materials and kits listed in Figure 22, page 19. Provide pipe adapt- ers if specified. 1.
  • Page 28 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 12 DIRECT VENT — (continued) Figure 32 See notices on previous page. 1. Air pipe penetration: a. Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

  • Page 29: Direct Vent - Vertical Concentric

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 13 DIRECT VENT — Allowable vent/air pipe materials & Figure 33 lengths 1. The concentric termination kit must be purchased sepa- rately. Use only the vent materials and kits listed in Figure 22, page 19.
  • Page 30 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 13 DIRECT VENT — (continued) See notices on previous page. Figure 34 1. Roof penetration hole: a. Cut a clearance hole to clear the termination outside di- ameter as prescribed in the kit instructions. b.

  • Page 31: Concentric Termination, Typical (Sidewall Or Vertical)

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 14 Concentric termination, typical (sidewall or vertical) Figure 36 Figure 36 1 — Inner PVC pipe (vent) 4 — Bird screen 2 — Outer PVC pipe (air) 5 — Y fitting 3 —...

  • Page 32: Vent And Air Piping And Boiler Connections

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 15 Vent and air piping and boiler connections Figure 38 Follow termination instructions 1. Read and follow all instructions for the termination type used before proceeding with this page. Follow all instructions provided by vent pipe manufacturer.
  • Page 33 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 15 Vent and air piping and boiler connections (continued) Figure 41 1. Clean and deburr inside and outside of both ends of air and vent pipes. Chamfer boiler end of vent pipe for ease of insertion. The vent pipe end must be smooth and chamfered to prevent possible damage to sealing gasket in vent pipe adapter.

  • Page 34: Install Water Piping

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 16 Install water piping Domestic Water Piping – Combi Boiler Use two wrenches when tightening water piping at boiler, using one of the wrenches to prevent the boiler interior piping from turning (wrench on both sides, here Hot Water Can Scald! and inside boiler).

  • Page 35: General Piping Information

    Use backflow preventer in the cold water supply piping if Weil-McLain, and suitable steps must be taken to avoid it. required by local codes. section for the proper cleaning procedure for the plate System/zone pipe sizing DHW heat exchanger, and the required cleaning frequency.

  • Page 36: Primary/Secondary System Piping

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 17 Primary/Secondary System Piping System water piping methods Expansion Tank Location Figure 47, page 37 show typical installation of the system expansion tank. It is highly recommended that you locate the air separator and expan- 1.

  • Page 37: Closed-Type Expansion Tank

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 17 Primary/Secondary System Piping (continued) Figure 47 Figure 48 Closed-type expansion tank: DO NOT use a closed-type tank if connecting to orrect all leaks in the system or tank piping. Leaks a water heater that is equipped with an automatic allow air to escape from the system and will cause water-logging of the tank.

  • Page 38: Install Relief Valve

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 17 Primary/Secondary System Piping (continued) Install relief valve 1. Install relief valve in 1 ” x 1 ” ¾” tee piped from boiler return -1/4 -1/4 (Figure 6, page 11). 2.

  • Page 39: Zone Valve Zoning - Primary/Secondary

    Circ. output. Use isolation relays if connecting 3-wire zone valve end switches to the HEAT input. Figure WMB-155C wall mount boiler 11 Primary/secondary connection (tees no more 18 By-pass pressure regulator, REQUIRED for zone 2 Relief valve, supplied by Installer, field piped —...

  • Page 40: Circulator Zoning - Primary/Secondary

    2. The boiler and circulators can also be operated by a zone controller. Figure 50 and Figure 51 WMB-155C wall mount boiler 11 Primary/secondary connection (tees no more 18 By-pass pressure regulator, REQUIRED for zone 2 Relief valve, supplied by Installer, field piped —...

  • Page 41: Circulator Zoning - Multiple Temperature Zones With Primary/Secondary

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 17 Primary/Secondary System Piping (continued) Circulator zoning – Multiple Figure 51 temperature zones with primary/ secondary See Figure 51 1. This configuration is for circulator-zoned systems with high- and low- temperature heating zones using a boiler loop connected as a secondary circuit off of a pri- mary system loop.

  • Page 42: Multiple Boiler Installations

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 18 Multiple boiler installations Figure 52 Placing multiple boilers 1. Locate multiple boilers with spacings shown in Figure 52. 2. Provide indicated clearances around boilers for access and ser- vicing.

  • Page 43: Install Condensate Line

    See ual. Failure to comply could result in severe per- Replacement parts section at the end of this sonal injury, death or substantial property damage. manual for the Weil-McLain kit. Part number 550-100-305/1016...

  • Page 44: Gas Piping

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 20 Gas piping Figure 56 Boilers are shipped ready to fire natural gas ONLY. You must install the propane venturi if the boiler will be connected to propane. See page 12. Failure to comply could result in severe personal injury, death or substantial property damage.
  • Page 45 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 20 Gas piping (continued) 1. See page 16 for gas line sizing information. 1. See Figure 57 for location of the gas inlet pressure test port. 1. Set up the boiler to operate at maximum rate as described in section “...

  • Page 46: Field Wiring

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 21 Field wiring Wiring must be N.E.C. Class 1. If original wir- — For your ing as supplied with boiler must be replaced, safety, turn off electrical power supply at service use only type 105 °C wire or equivalent.
  • Page 47 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 21 Field wiring (continued) Figure 60 Either a voltage free thermostat or a 24VAC thermostat can be connected to the boiler. Outdoor sensor uses the back connection block, see Figure 59, Item 138, (right side of block …...

  • Page 48: Wiring Diagram - Combi Ladder

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 23 Wiring diagram — Combi Ladder Figure 62 NOTES: All wiring must be installed in accordance with N.E.C. and any other national state or local requirements. Room thermostat should be a dry contact type and should draw power from the control board: should not be...

  • Page 49: Wiring Diagram - Combi Schematic

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 23 Wiring diagram — Combi Schematic Figure 63 Part number 550-100-305/1016...

  • Page 50: Controls And Operation

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 24 Controls and operation Control Introduction This boiler is a high-efficiency condensing pre-mix appliance Thanks to the microprocessor control and adjustment system for central heating and hot water production, running on with advanced self-diagnosis, unit operation is for the most part Natural gas or Liquefied Petroleum (Propane) gas, generating automatic.
  • Page 51 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 24 Controls and operation (continued) Central heating operation The Central Heating heat demand (generated by the Room Thermostat) is indicated by the flashing of the Hot Air symbol over the radiator (Items 13 and 14 - Figure 64, page 50).
  • Page 52 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 24 Controls and operation (continued) Initial power up mode Ensure the power is on to the boiler Figure 67 During the first 5 seconds, the display shows the software version of the pcb. For the first 300 seconds, the display shows FH that identifies the Air purge function.
  • Page 53 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 24 Controls and operation (continued) Adjustments Figure 69 To set the system Heating temperature, use the CH buttons, “-” to reduce water setpoint “+” to increase water setpoint (Items 3 and 4 - Figure 64, page 50).

  • Page 54: Outdoor Reset Control

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 24 Controls and operation (continued) Adjustments Figure 71 Theory of Outdoor Reset Control One of the key points to boiler efficiency, is to match the heat generated by the boiler to the heat loss of the build- ing to be able to obtain a given comfort level in the living space.

  • Page 55: Dhw Settings

    Figure 76 Heat [GPM with [GPM with [GPM with [GPM with [MBH] 7 ž)@ 7 ž)@ 7 ž)@ 7 ž)@ WMB-155C Starting temperature Figure 77 DHW curve - Figure 75 Freestyle 155 - DHW PRODUCTION WMB-155C G.P.M. 14.5 2))6(7 13.5 12.5 11.5...

  • Page 56: Standard Altitude Blower Speeds

    National Fuel Gas Code, ANSI Z223.1/NFPA 54 -latest edition, and/or the Natural Gas and Propane Instal- lation Code, CAN/CSA B149.1. For elevations above 10,000 feet, please contact Weil-McLain Technical Support for details. CIRCULATOR EXERCISING and FREEZE PROTECTION CIRCULATOR EXERCISING 1. The control will automatically start the circulator output and run for 10 seconds for each 72-hour period of inactivity.

  • Page 57: Startup

    Antifreeze no noticeable air flow is present. Close the zone isolation 1. Use only antifreeze listed by Weil-McLain as suitable for valves and proceed with the next zone. Follow this proce- use with Combi boilers. See Figure 124, page 93 for infor- dure until all zones are purged.
  • Page 58 Use only antifreeze recommended by Weil-McLain. Check/verify water chemistry Weil-McLain provides information for 1. The system may have residual substances that could affect water application of the antifreeze products chemistry. listed in this document only for use in boilers.

  • Page 59: 6Wduwxs ² ¿Qdo Fkhfnv

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 28 6WDUWXS ² ¿QDO FKHFNV 4. If a voltage does occur under any condition, check and correct the external wiring. Check for gas leaks Before starting the boiler, and during initial operation, .
  • Page 60 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 28 6WDUWXS ² ¿QDO FKHFNV (continued) Final checks before lighting the boiler 3. The boiler lights at the maximum heating 100% rate dis- Open any on-off valves between boiler and the systems. played on the LCD display.
  • Page 61 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 28 6WDUWXS ² ¿QDO FKHFNV (continued) Figure 82 Part number 550-100-305/1016...
  • Page 62 DO NOT adjust or attempt to measure gas valve outlet contact your local Weil-McLain Technical Sup- pressure. The gas valve is factory-set for the correct outlet port. Throttle screw adjustment must be done pressure.
  • Page 63 Weil-McLain Technical Support for details. Max. Regulating screw 5. Should you require any assistance during the set up pro- cedure contact your Weil-McLain Technical Support if Test at Max Power 100% the problem cannot be addressed with the information provided in this manual.
  • Page 64 IRU ³0$; JDV ÀRZ´ c. When disassembling components, inspect gaskets to see if there is damage. Replace any damaged gasket. Turn counter-clockwise d. Contact your Weil-McLain Technical Support if the (close gas) problem cannot be addressed with the information IRU ³0,1 JDV ÀRZ´...

  • Page 65: 6Wduwxs Yhul¿Fdwlrq

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 29 6WDUWXS YHUL¿FDWLRQ ❏ Additional field-installed limit control(s) set to system Adjust and test boiler controls temperature requirements? Balancing valves and controls 1. Follow instructions in this manual to set and verify operation adjusted to provide design temperature to system? of the boiler controls.

  • Page 66: Annual Startup And General Maintenance

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 30 Annual startup and general maintenance Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the boiler. Failure to perform the service and maintenance could result in damage to the boiler or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death or substantial property damage.

  • Page 67: Annual Startup

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 31 Annual startup HANDLING CERAMIC FIBER FIRST-YEAR SPECIAL INSPECTION MATERIALS after the boiler is installed, per- form a first-year inspection of the boiler. This should include the following a. The integrity of the flue system and the flue seals; The heat exchanger refractory contain b.

  • Page 68: Check Control Settings

    Eliminate all system or boiler leaks. Continual fresh ceptable, check combustion values. If combustion is properly make-up water will reduce boiler life. Minerals adjusted, obtain a replacement burner from Weil-McLain. can build up in the heat exchanger, reducing heat transfer, overheating heat exchanger, and causing heat exchanger failure.
  • Page 69 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 31 Annual startup (continued) Check automatic air vents (if used Check boiler relief valve — automatic air vents must be used with 1. Inspect the relief valve and lift the lever to verify flow as in the following warnings, excerpted from a relief valve manufac- turer’s warning label.

  • Page 70: Troubleshooting

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting Before calling for troubleshooting assistance, fill in the “ ” (page 100). 1. Check for 120VAC (minimum 102 VAC to maximum 132 VAC) to boiler. Record the boiler size and CP number (located on the 2.
  • Page 71 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Check ignition sequence The ignition sequence time line and operational description for the Combi boiler below help to understand the timing of the cycles. In your troubleshooting, refer to the numbers 1 through 7 as they describe each step of the ignition cycle. Figure 91 HEAT DEMAND PRE-PUMP TIME...
  • Page 72 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Check flame signal Figure 92 1. Navigate to Diagnostics/Inputs on the control display (see pages 50 to 54 for navigation instructions. Fuse located on rear of circuit board 2.
  • Page 73 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Control diagnosis 1. The boiler control is equipped with an advanced self-diagnosis system. In case of a boiler fault, the display will flash together with the fault symbol (see Table 3 or Table 4) indicating the fault code. 2.
  • Page 74 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 95 (continued) Fault Code Fault Potential cause Correction No burner ignition &KHFN WKH UHJXODU JDV ÀRZ WR WKH ERLOHU DQG WKDW No gas the air has been eliminated from the pipes. Check the wiring of the electrode and that it is Ignition/detection electrode fault correctly positioned and free of any deposits.
  • Page 75 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 96 (continued) Fault Code Fault Potential cause Correction Probe damaged Exhaust probe fault Check the wiring or replace the exhaust Wiring shorted probe. Wiring disconnected Sensor damaged Check the wiring or replace the CH sensor.
  • Page 76 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 97 (continued) Blocking codes The boiler controller recognizes also the fault situations that can block the heat demands but do not lead to lockout condition. When the error condition becomes resolved, error will disappear but will be also written into the history data.
  • Page 77 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 98 (continued) Display Condition FAULT 11 = CH return sensor out of normal operating range (short circuit or open circuit). If sensor goes outside the range, error will be generated.
  • Page 78 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 99 (continued) Display Condition FAULT 37 = Low water pressure error can be caused by the low water pressure in the central heating system. This can be GHWHFWHG LQ  ZD\V YLD ORZ ZDWHU SUHVVXUH VZLWFK DQG YLD ZDWHU SUHVVXUH VHQVRU ZLWK D FRQ¿UPLQJ WLPH RI  seconds).
  • Page 79 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 100 Configuration mode By pressing the DHW- and DHW+ push buttons together for 10 seconds, it is possible to enter into the Configuration mode. The display starts with showing “ ”...
  • Page 80 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 101 Installer mode By pressing the RESET push button for 20 seconds, it is possible to entered the Installer mode. During this time, the OTC mode must not be entered.
  • Page 81 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) “tS” as Transparent Parameters mode (TSP) Selecting “tS” the display starts with showing “ ” blinking. By means of the CH+ and CH- push buttons it is possible to select the parameters;...
  • Page 82 Freq. in CH selection button Relay level (F/min) Off Time WMB-155C N  1DW JDV WMB-155C LP  /3* “In” as Inquiry mode Selecting “In” the display starts with showing “ ” blinking. By means of the CH+ and CH- push buttons it is possible to select the parameters;...
  • Page 83 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 32 Troubleshooting (continued) Figure 104 “Hi” as History mode Selecting “Hi” the display starts with showing “ ” blinking. By means of the CH+ and CH- push buttons it is possible to select the parameters;...

  • Page 84: Maintenance

    — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance Clean condensate trap Disconnect power 1. See Figure 106. 2. Disconnect top cleanout cap nut that secures the trap body to Electrical shock hazard — Discon- the boiler condensate connection. nect all electrical power to the boiler before attempting maintenance pro- 3.
  • Page 85 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) Figure 107 Figure 109 2. Remove two (2) Phillips head screws securing the ignition electrode to the boiler heat exchanger. 3. Carefully slide the igniter out of its mounting slot. Use care when removing and handling igniter.
  • Page 86 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) Figure 111 Figure 113 Remove the heat exchanger cover plate and the gasket. Inspect the burner exterior. It must be in good condition, with no visible damage. Remove the burner and burner gasket from the heat Clean the underside of the burner flange with a soft brush exchanger cover plate if still in place.
  • Page 87 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) Inspect and clean the heat exchanger Lightly spray clean water on all of the boiler coils and Wait until heat exchanger/boiler is cooled down before proceeding. Failure to do so can cause clean any residue off with (plastic only) brush.
  • Page 88 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) Procedure For Cleaning Heat Exchanger Figure 118 Waterways This procedure is intended as a guideline for a correct restoration of the functionality of the boiler as a result of operation with untreated water, very hard water feeding conditions, debris, lime scale, sludge, metal oxides and, in low temperature systems, also biomass in the heat exchanger water circuit.
  • Page 89 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) Procedure for chemical cleaning of DHW circuit Carefully read and follow the instructions contained in this in- struction booklet. Chemical cleaning and maintenance must be carried out by pro- fessionally qualified personnel, in compliance with the current regulations and according to the manufacturer’s instructions.
  • Page 90 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) Before you start check the compatibility of chemi- cal cleaning product with the material of the heat Hot Water Can Scald! exchanger. The material of domestic hot water circuit is stainless steel, class AISI 316.
  • Page 91 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 33 Maintenance (continued) 4. Close the valve of CH system supply (1) and return (5) placed brazed plate heat exchanger must be rein- stalled in the same orientation. before the boiler connections. 5.

  • Page 92: Replacement Parts

    Failure to adhere to these guidelines can NUMBERS Obtain parts only through Weil-McLain Replacement parts must be purchased through a local Weil-McLain WHEN OPERATING THE distributor. When ordering, specify boiler model and size and include BOILER ON PROPANE GAS description and part number of replacement part. Results from us- ing modified or other manufactured parts will not be covered by...
  • Page 93 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 34 Replacement parts (continued) Figure 123 M&G Simpson-Duravent PolyPro SIDEWALL concentric vent/air kit (color: Antifreeze, Sentinel X500..592-900-029 white) 3PPS-HK Corrosion inhibitor, Sentinel X100 ..592-900-002 3”...
  • Page 94 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 34 Replacement parts (continued) Figure 124 Item Name Part Number Jacket door 640-000-067 Jacket left side 640-000-065 Jacket right side 640-000-066 Part number 550-100-305/1016...
  • Page 95 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 34 Replacement parts (continued) Figure 125 Item Name Part Number Control module assembly 640-000-003 Control module display cover 640-000-004 Pressure-Temperature assembly 640-000-006 Wire harness assembly - Combi - 640-000-085 PCB only (includes Circuit board, Transformer, Relay, 640-000-062 Terminal strip, Fuse Holder &...
  • Page 96 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 34 Replacement parts (continued) Figure 126 Item Name Part Number Heat Exchanger 640-000-080 Flue Sensor Temperature 640-000-011 Blower 640-000-081 Blower Gasket 640-000-021 Ignitor 640-000-109 Central Heat Exchanger Insulation 640-000-010 Burner 640-000-012 Burner Gasket Set...
  • Page 97 — C AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 34 Replacement parts (continued) Figure 127 Part number 550-100-305/1016...

  • Page 98: Connections, Dimensions And Engineering Data

    Boiler weight weight content required Model WMB-155C 0.75 3” 15.0 Total amp requirement includes up to one circulator, Low Water Cutoff, 3-Way Valve not to exceed 3.0 amps total. Operating weight is the total weight of the boiler, including water.

  • Page 99: Ratings

    (Note 3) (Note 4) WMB-155C 3” PVC/PP/SS Notes As an Energy Star Partner, Weil-McLain requirements of the building and noth- 5 Ratings shown are for sea level applica- has determined that boilers meet the ing need be added for normal piping tions only.

  • Page 100: Qvwdoodwlrq Dqg 6Huylfh &Huwl¿Fdwh

    AquaBalance OUNT GAS FIRED WATER BOILER OMBI Boiler Manual 37 ,QVWDOODWLRQ DQG 6HUYLFH &HUWL¿FDWH Boiler Start-Up Data WMB-155C Date installed ________________ # +LJK ¿UH BBBBBB /RZ ¿UH BBBBBB Boiler Model / Series / Series ____ Part Number ____________ FUEL: Natural ____ LP ____ Btu Input ___________________ &2 # +LJK ¿UH BBBB SSP /RZ ¿UH BBBB SSP...

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