Laars Boiler Might Therm PW 325 Install Operation and Maintenance Manual

Installation, Operation and Maintenance Instructions

Document 2051F

Installation, Operation
and Maintenance
Instructions for

Mighty Therm
Volume Water Heaters
Model VW-PW
Sizes 175-400

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty.

WARNING

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building. • Immediately call your gas supplier from a nearby phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.

H0147500F

Installation and service must be performed by a qualified installer, service agency, or gas supplier.

LAARS Heating Systems

SECTION 1.
General Information

3.5
3.6

1.1
1.2
1.3

SECTION 4.
Maintenance

SECTION 2.
Installation Instructions
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3
2.4
2.4.1
2.4.2
2.4.3
2.5
2.5.1
2.5.2
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.6.6
2.6.7
2.6.8
2.6.9
2.6.10
2.6.11
2.7
2.7.1
2.7.2
2.8
2.9
2.9.1

Thermal Circulation of Hot Water in
Combined Space Heating/Potable

4.1
4.2
4.3
4.3.1
4.3.2

3.1
3.2
3.3
3.3.1
3.3.2
3.4

Remote Water Heater Temperature
Internal Water Heater Temperature
Adjustment for Minimum Input Rate

SECTION 5.
Troubleshooting
5.1
5.1.1
5.1.2
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
5.2.9
5.2.10
5.2.11
5.2.12
5.2.13
5.2.14
5.2.15
5.2.16

SECTION 3.
Operating Instructions

5.2.17
5.2.18
5.2.19

Checking the Manifold
Testing the Manual Reset
Testing the Fusible Link
Testing the Ignition Control
Testing the Ignition Control
Testing the Safety Shutoff
Testing the Safety Shutoff
Testing the Pilot Thermocouple
Testing for Pilot burner
Testing for Burner Ignition
Testing the Terminal Strip/External