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Series 2

Wall Mount

Gas-Fired Water Boilers

70/110/155

Part number 550-142-190/1218

This manual must only be used by a qualiﬁ ed heating installer/service technician. Read all instructions, including 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

Boiler Manual

Table of Contents2
The ECO Series 2 Gas-Fired Water Boilers3
Please Read before Proceeding7
Boiler Location8
Wall-Mounting the Boiler10
Display Bracket Installation12
Boiler Hydrostatic Test13
Converting Boiler to Propane - ECO 7015
Converting Boiler to Propane - ECO 11016
Converting Boiler to Propane - ECO 15517
Gas Piping - Sizing Gas Lines21
Venting/Air Piping - General22
Commonwealth of Massachusetts Installations25
Vent Termination Requirements26
Boiler Room Air Openings27
DIRECT VENT - Sidewall with Separate Pipes28
DIRECT VENT - Sidewall Concentric30
DIRECT VENT - Sidewall with W-M Vent/Air Plate32
DIRECT VENT - Vertical with Separate Pipes35
DIRECT VENT - Vertical Concentric37
DIRECT VENT - Vertical Vent /Sidewall Air39
Concentric Termination, Typical (Sidewall or Vertical)40
Vent and Air Piping and Boiler Connections41
Install Water Piping42
Direct Connect System Piping43
- Verify the Application will Work43
- Expansion Tank Location43
- Diaphragm- or Bladder-Type Tank43
- Closed-Type Expansion Tank44
- System Water Piping Methods45
- Install Relief Valve45
- ZONE VALVE Zoning - Direct Connection46
Primary/Secondary System Piping47
- Expansion Tank Location47
- Diaphragm- or Bladder-Type Tank47
- Closed-Type Expansion Tank48
- System Water Piping Methods49
- Install Relief Valve50
ZONE VALVE Zoning - Primary/Secondary51
CIRCULATOR Zoning - Primary/Secondary52
Multiple Boiler Installations54
Install Condensate Line58
Gas Piping59
Field Wiring60
Wiring Diagram - Schematic64
Wiring Diagram - Ladder65
EXPRESS SETUP - Using Default Settings66
ECO Control Operation67
ESSENTIAL Settings69
ECO Control Settings Menus70
BOILER SETTINGS Menu71
HEATING SETTINGS Menu72
DHW SETTINGS Menu74
CIRCULATOR EXERCISING and FREEZE PROTECTION75
DIAGNOSTIC Menu76
DATE and TIME Menu78
Startup - Fill the System79
Startup - Final Checks81
Check-Out/Startup Veriﬁcation87
Annual Startup and General Maintenance88
Annual Startup89
Troubleshooting95
Maintenance103
Cleaning Heat Exchanger Flue Side, 70105
Cleaning Heat Exchanger Flue Side, 110106
Cleaning Heat Exchanger Flue Side, 155107
Replacement Parts114
Dimensions126
Ratings - ECO Series 2 Boilers127
Ratings - Multiple ECO Series 2 Boilers128
Installation and Service Certiﬁcate129
ECO Series 2 Gas Boiler Data Collection Sheet130

Fuel Type	Natural Gas or Propane
Dimensions	Varies by model
Max Temperature	240°F
Type	Water Boiler
Water Content	Varies by model
Weight	Varies by model

Weil-McLain Series 2 User Manual

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