Weil-McLain Aqua Balance WMB-155 User Manual

Boiler Manual
* CSA - Low Lead Content only applies to the Combi model
Part number 550-100-305/0118
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.
Aqua Balance
WMB-80/120/155
Wall Mount Gas-Fired
Condensing Boilers – Combi and Heating Only Models
Quick Start Guide
Pages 3 & 4
*
• Installation
• Startup
• Maintenance
• Parts

Weil-McLain Aqua Balance WMB-155 Specifications

General

Brand	Weil-McLain
Model	Aqua Balance WMB-155
Category	Boiler
Language	English

Summary

Quick Start Guide — using default settings

System start

Prepare boiler location

Provide clearances from combustible materials — REQUIRED

Required minimum clearances from combustible materials for safe installation.

Prepare boiler

Wall-mounting requirements

Requirements for securely mounting the boiler to a wall structure.

Converting boiler to propane

Mandatory control changes for fuel conversion

Vent and air piping and boiler connections

Installing vent and air piping

Connecting vent and air piping to the boiler and installing adapters.

Install water piping

Domestic Water Piping – Combi Boiler

Specific instructions for domestic water piping on Combi boiler models.

Primary/secondary piping to boiler

Primary/Secondary System Piping

Expansion Tank Location

Closed-type expansion tank

Install relief valve

Correct installation of the pressure relief valve and its discharge piping.

Zone Valve zoning – primary/secondary

Circulator zoning – primary/secondary

Circulator zoning – Multiple temperature zones with primary/secondary

Gas piping

Connecting gas supply piping

Steps for connecting the gas supply piping to the boiler.

Field wiring

Combi and Heating Only boiler wiring

Wiring guidelines specific to Combi and Heating Only boiler models.

Controls and operation

Central heating operation

How the boiler operates for central heating, including display indicators.

Domestic hot water operation

Initial power up mode

Startup

Clean system to remove sediment

Purge air from water system

Use of X100 inhibitor is REQUIRED

Startup — final checks

Inspect/fill condensate system

Propane boilers — verify conversion

Check flame & combustion with instruments

Checking flame and combustion using instruments.

Setting the Air/Gas Ratio valve

Adjusting the air/gas ratio valve for optimal combustion.

Check ignition system safety shutoff device

Annual startup and general maintenance

Annual startup

FIRST-YEAR SPECIAL INSPECTION

Check burner flame

Inspecting and assessing the burner flame for proper operation.

Check boiler relief valve

Inspecting and testing the boiler's pressure relief valve.

Troubleshooting

Check ignition sequence

Understanding the boiler's ignition sequence for troubleshooting.

Check flame signal

Diagnosing issues related to the flame signal strength.

Check control fuse

Checking and replacing control circuit fuses.

Checking temperature sensors

Verifying temperature sensor resistance values.

Control diagnosis

Understanding the boiler's self-diagnosis system and error codes.