Weil-McLain WM97+ User Manual

This manual must only be used by a qualified heating installer/service technician. Read all instructions, includ-
ing this manual and all other information shipped with the boiler, before installing. Perform steps in the order
given. Failure to comply could result in severe personal injury, death or substantial property damage.
• Installation
• Startup
• Maintenance
• Parts
Product Manual
Part number 635-500-156/0113
Companion
Water Heater
for WM97+ Gas-Fired Boilers
High Performance
Companion Water Heater
(Boiler sold separately)
®

Weil-McLain WM97+ Specifications

General

Brand	Weil-McLain
Model	WM97+
Category	Boiler
Language	English

Summary

Please read before proceeding

When servicing water heater

Safety precautions for servicing the water heater, including electrical and thermal safety.

Operating restrictions

Boiler water restrictions

Pre-installation

CWH Mixing valve

Mixing valve must be installed

Emphasizes mandatory installation of the mixing valve for safety and proper operation.

Mixing valve installation and adjustment

Guidance on installing and adjusting the supplied mixing valve kit.

Domestic water piping

Piping overview

Boiler/CWH piping — 70 or 110 / Right-side mixing valve

Boiler/CWH piping — 70 or 110 / Left-side mixing valve

Boiler/CWH piping — 155 / Right-side mixing valve

Boiler/CWH piping — 155 / Left-side mixing valve

CONNECTIONS TO BOILER AND SYSTEM

Details for connecting the CWH to WM97+155 boilers with left-side mixing valve.

Wiring

Connect circulator and sensor harnesses

Instructions for routing and connecting circulator and sensor harnesses.

Water heater filling and start-up

Filling the domestic water tank

Start-up checklist

Essential checks before initiating boiler and water heater start-up.

WM97+ control set-up

Verify operation

CWH Performance Mode quick set-up

HIGH PERFORMANCE

NORMAL

Water heater maintenance

ANNUAL maintenance by qualified service technician

Technician tasks: check temps, pressure, operate T&P valve, check controls.

Shutdown procedure

WM97+ Control settings – Advanced

DHW SETTINGS

DHW PERFORMANCE

Selects performance mode: High, Normal, Economy, Off-Disable, Vacation, Schedule.

TANK STORAGE TEMPERATURE

ADVANCED SETUP

TO DISABLE CWH OPERATION AND REVERT TO HEATING OPERATION ONLY

Procedure to disable CWH and revert to boiler heating operation only.

Troubleshooting

Preparation for troubleshooting

Insufficient hot water

Diagnoses and resolves issues related to lack of sufficient hot water.

Excessive domestic water temperature

Troubleshooting steps for domestic water being too hot.

Boiler relief valve lifting or weeping

Addresses issues with the boiler's pressure relief valve lifting or weeping.

CWH Temperature/pressure relief valve lifting or weeping

Diagnoses T&P valve issues on the CWH side.

Water on the floor near the tank

Identifies potential sources of water leaks on the floor near the unit.

Top of tank or enclosure wet

Water quality problems

Addresses issues like smelly, milky, or discolored hot water.