Laars Mini-Therm II JVT (Sizes 50-225) - Install and Ope User Manual download pdf (Page 4)

LAARS Heating Systems

Page 4

1. Plumbing materials for the bypass piping, which

is required for:

a. Any system where the return water

temperature may be less than 120°F, such

as in-floor radiant systems, snow melt

systems or other systems where a “cold

start” is expected frequently due to

thermostat setbacks, etc. See Figure 11.

b. Any system where the temperature rise

across the heat exchanger is above 30°F

(see Section 5 and Figure 7).

2. Combustion air grates for openings sized in

accordance with Section 3.1.

3. Field interlock wiring for any motorized

combustion air louvers to ensure the boiler does

not fire if motorized louvers do not open.

4. A suitable non-combustible base if installed on a

combustible floor (see Section 2.3.2)

1.5.3 Diagnostic Tools

The following materials are needed to verify

correct installation:

1. Gas manometer to verify gas pressure

2. Strap-on, digital or infrared thermometer to

check temperature rise across the heat exchanger.

3. Suggested: Draft gauge and combustion test

equipment.

1.6 Specifications

1.6.1 General Specifications

1. Installation Location:

Certified for use in Indoor Applications only

2. Minimum Clearance From Combustible

Material:

See Table 1 in Section 2.3.1.

3. Supply Gas Type:

Certified for use with Natural Gas and LP Gas

4. Gas Pipe/Boiler Gas Valve Connection:

Nat LP

50-225 ½" NPT ½" NPT

5. Inlet Gas Supply Pressure:

Minimum Maximum

Natural Gas: 5.5" WC 10.5" WC

LP Gas: 10.0" WC 13.0" WC

6. Water Pipe/Boiler Connection:

1 ¼" NPT

7. Water Flow Rate:

See Table in Section 5.2

8. Pressure Relief Valve:

30 PSI

9. Recommended system pressure:

12 PSI

10. Exhaust Vent Connection Size:

50 4" Diameter

75-100 5" Diameter

125-160 6" Diameter

225 7" Diameter

11. Electrical Supply:

115 Volts AC

12. Modification of Boiler for High Altitude:

Mini-Therm II Boilers are normally shipped

from the factory in the low altitude (sea level)

operational configuration. When requested, the

boilers can be configured and shipped for higher

altitudes. For field conversions to change altitude

configurations, conversion parts are available

from Laars. For more information or call the

Customer Service Department.

1.6.2 Dimensions

See Figure 1 for a diagram showing the boiler’s

exterior dimensions and dimensions to critical

connections on the boiler.

SECTION 2.

Installation Instructions

2.1 Introduction

WARNING

Improper installation or maintenance can cause

nausea or asphyxiation from carbon monoxide in

flue gases which could result in severe injury, or

death.

AVERTISSEMENT

Une installation ou un entretien in adéquat peut

causer la nausée ou l’asphyxie en raison du

monoxyde de carbone présent dans les gaz de

combustion et même entrainer des blessures

graves ou la mort.

Install the Mini-Therm II boilers and vent

dampers in accordance with the procedures in this

manual, local codes and ordinances, and in accordance

with the latest edition of the appropriate national code

(see Section 1.3 “Codes and Standards”).

All gas-fired products require correct installation

to assure safe operation. The requirements for boilers

include the following:

1. Field assembly

2. Appropriate site location (clearances) and

flooring

3. Sufficient combustion and ventilation air

4. Properly sized gas meter and piping

5. Proper electrical wiring (if required)

6. Adequate water flow

This manual provides the information needed to

meet these requirements. Review all application and

installation procedures completely before continuing

the installation.

NOTE: The Mini-Therm II boiler is approved for indoor

installation only.

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