Thermo Products Models from 8 kW to 24 kW : 240 Volts ( single phase ) Installation, Location

Section 3 : INSTALLATION

!WARNING

The manufacturer’s warranty does not cover any damage or defect caused by installation or attachment or use of any special attachment other than those authorized by the manufacturer into, onto, or in conjunction with the water heater. The use of such unauthorized devices may shorten the life of the water heater and may endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized devices.

3.1 SAFETY MEASURES

All domestic and commercial installations will include a pressure relief valve limiting the operating pressure to 30 psi.

This COMBOMAXMC electric boiler is designed for a maximum operating temperature of 190°F. It is designed as a hot water heating system only. A 30 to 50% water and ethylene- or propylene-glycol blend is allowed.

3.2 LOCATION

The COMBOMAXMC water heater should be installed in a clean, dry location. Long hot water lines should be insulated to conserve water and energy. The water heater and water lines should be protected from exposure to freezing.

COMBOMAXMC water heaters must be installed vertically. Use the adjustable feet to level the unit.

The COMBOMAXMC water heater must be located or protected so as not to be subject to physical damage, for example, by moving vehicles, area flooding, etc..

All models can be installed on combustible floors and in alcoves. If the water heater is to be installed in a restaurant or other location where the floor is frequently cleaned, it must be elevated to provide at least 6 inches of clearance from the floor to comply with NSF International recommendations.

The room temperature must not exceed 80°F or 27°C.

3.3 CLEARANCE

The minimum clearances required for proper inspection and servicing are as follows:

Table 4: Clearances

Left side	3 inches
Right side	3 inches
Top	24 inches
Front	24 inches
Back	3 inches

3.4 SYSTEM SETUP

Figures 2, 3 and 4 are general connection diagrams including the circulator, the expansion tank, the drain cock, the safety valve, the air bleeder, the flow check valve and the thermo manometer. Set-up details follow.

3.5 HEATING WATER CIRCUIT

3.5.1Connecting the heating water piping

The boiler may be set up alone or in parallel with others. Parallel connections should be made using the reverse-piping method to ensure equal flow through each boiler.

The boiler water supply connector is located on top of the boiler and the boiler water return connector is located to the left of the three-way valve. They are both threaded NPT female connectors.

Unions are recommended on the hot and cold water lines to disconnect the water heater easily for servicing if necessary.

Dielectric (insulating) unions are required for protection of the water heater if copper-steel connections are made.

Use only clean copper or approved plastic pipe for water connections. Local codes or regulations shall govern the exact type of material to be used.

Insulate all pipes containing hot water, especially in unheated areas.

COMBOMAXMC Electric boiler Set-up, use and care guide (revised January 2006), Page 5.