Laarsen Associates PW, IW, VW General Information, 1A. Introduction, 1B. Heater Identification

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Mighty Therm Volume Water Heater

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SECTION 1.

General Information

1A. Introduction

This manual provides information for the installation and operation of Laars volume water heaters. It is strongly recommended that all application and installation procedures be reviewed completely before proceeding with the installation. Consult the Laars factory, or local factory representative, with any problems or questions regarding this equipment. Experience has shown that most problems are caused by improper installation.

Some accessory items are shipped in separate packages. Verify receipt of all packages listed on the package slip. Inspect everything for possible damage upon delivery, and inform the carrier of any shortages or impairments. Any such claims should be filed with the carrier. The carrier, not the shipper, is responsible for shortages and damage to the shipment whether visible or concealed.

WARNING

All volume water heaters must be installed in accordance with the procedures outlined in this manual. The warranty does not apply to heaters not installed or operated in accordance with these procedures. Consult local building and safety codes before proceeding with work. The installation must conform to the requirements of the authority having jurisdiction or, in the absence of such requirements, to the latest edition of the National Fuel Gas Code; ANS1 Z223.1, National Electrical Code ANSI/ NFPA 70 and/or in Canada CAN1-B149 requirement.

When required by the authority having jurisdiction, the installation must conform to American Society of Mechanical Engineers safety codes for controls and safety devices for automatically fired heaters No. CSD-1, and in Canada CGA 3.3. Any modification to the water heater, its gas controls, gas orifices, wiring or draft diverter may void the Laars warranty. If field conditions require such modifications, consult factory.

1B. Heater Identification

Consult rating plate on the heater. The following example simplifies the heater identification.

1

2

3

4

5

6

PW

1670

I

N

09

C

 

 

 

 

 

 

1.Basic heater model.*

2.Input rate X 1000 BTU/hr.

3.Indoor (I) or Outdoor (E) installation.

4.Gas type: Natural (N) or Propane (P).

5.Ignition system: I.I.D. (09) or continuous pilot (16).**

6.Firing rate: On/Off (C), 2-stage (K), 4-stage (L).

*Model VW water heaters for use with separate storage tank. There must be a field installed pump to circulate water between the heater and the storage tank.

*Model PW water heaters are basically the same as the VW series except that the PW heaters come with integrally mount pumps.

*Model IW water heaters are tankless instantaneous heaters, complete with mount pump for use in applications having a suitable diversity in heater load.

**Special Options: I.I.D. (04) 115 volts.

Laars commercial water heaters are available in two models: an indoor version and an outdoor version. Both are available from the factory (see Figure 1).

 

 

 

 

 

 

 

295/8

 

 

 

 

12¼

Pump

 

 

 

 

 

(752)

C

 

 

 

(311)

 

 

 

 

 

 

 

 

 

 

 

 

Gas

 

 

 

 

 

 

 

 

 

 

 

Conn.

 

 

 

 

 

 

 

 

 

A

V

58

 

 

Out

In

Rear

 

 

 

 

(1473)

 

 

 

 

 

 

 

 

 

 

 

 

Front

 

 

 

 

 

17¾

 

 

29

 

 

 

 

 

 

 

(197)

 

 

 

 

 

 

 

 

 

(737)

 

 

 

 

 

 

 

 

 

 

 

10¼

 

 

 

 

 

 

 

 

 

 

 

(260)

 

 

 

17

28¼

 

 

 

 

 

 

 

 

 

 

(718)

 

 

 

 

 

 

Top

 

 

 

(432)

 

 

 

 

 

 

 

 

 

Side

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

Pump

 

 

 

 

 

 

 

 

 

 

(PH Models)

 

 

 

 

 

Out In

 

 

 

 

 

 

 

 

 

 

 

 

61

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1549)

 

 

30¾

 

 

 

 

14

 

 

 

 

 

 

 

 

(356)

 

 

 

 

 

(781)

 

 

 

 

 

 

 

19

Gas

 

 

(197)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(483)

Inlet

 

 

 

 

 

 

 

 

 

 

 

12

A

 

 

 

 

41¾

 

4

 

 

 

 

 

 

 

(1060)

 

 

 

 

(305)

 

 

 

 

 

(102)

 

 

 

Front

 

 

 

 

Side

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1. Boiler Configuration.

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Contents Mighty Therm Table of Contents General Information 1A. Introduction1B. Heater Identification 1C. Flow Requirements Installation2A. Heater Placement 2B. Installation of Indoor HeatersInstallation on Concrete Blocks or Tile 2B-1. Combustion Air Supply 2D. Gas Supply and Piping 2C. Installation of Outdoor Heaters2F. Water Piping of System 2E. Electrical WiringPressure Relief Valve Location 2G. Water Expansion2H. Pump Performance and Installation Hot Water Supply System Model VW & PW With Vertical Tank HorizontalSplit System Piping Diagram, Model IW Dual Installation Piping Diagram, Model IW With Vertical Tank With Horizontal TankMighty Therm Volume Water Heater 2I. Water Pressure 2J. Tank Installation2K. Two-Temperature System Operation3B. Initial Start-Up Hi-Limit Checkout 3C. To Start Up SystemIndoor Models Maintenance3D. To Turn Off Heater 3E. To Shut Down SystemHeater will not Fire Troubleshooting and Analysis Service ProblemsIII. Water Dripping Firebox Numbers Parts Identification Laars Heating Systems Tile Assemblies Ignition Control, Electronic Safety Gas Valve, On-Off Two Stage Nat Plug, 3/4, Sq. Hd Outdoor Parts See Parts Illustration On Outdoor Parts Descriptions and Order NumbersMighty Therm Volume Water Heater Pump Rotating Sections and Repair Parts Optional Parts Descriptions and Order NumbersEnergy Management Monitor EM2