Thomas & Betts EPW dimensions Dimensions, Initial Inspection, Installation

Applies to Heater Model EPW

Electric,

Water Circulation Heater

Installation/Operation/Maintenance Form MI511

1.0INITIAL INSPECTION

1.1Upon receipt from the carrier, inspect the heater for possible damage in transit. If necessary, immediately report damage to shipping company.

1.2Verify that the nameplate voltage, phase, wattage and catalog number comply with the order.

1.3The EPW, when configured:

•as a swimming pool heater, has a catalog number EPWP;

•as a domestic water or dishwasher water booster heater, has a catalog number EPWD;

•as a hot water furnace for comfort or process water heating, has a catalog number EPWH.

Figure 1

DIMENSIONS

29"

11 3/4"

15"

22 1/2"

Knockouts 1",	1 1/2" DRAIN
1 1/4", 1 1/2 & 2"
	16 1/4"

4"

7 1/2"

HOLDING BOLTS

FOR BRACKET

1 1/2" OUTLET

1 1/2" INLET

10 3/4"

7 1/2"

15"

These units differ in trim package, i.e. auxiliary controls. For this reason IT IS IMPORTANT THAT THE UNITS BE USED ONLY FOR THE SPECIFIC APPLICATIONS AS STATED ABOVE.

2.0INSTALLATION

2.1The heater must be installed by qualified personnel to code requirements.

2.2Ensure that the electrical power supply is the same voltage and phase as the heater with sufficient current capacity.

2.3The heater must be installed in a horizontal position with the outlet at the top and the drain at the bottom.

2.4The mounting hardware, as provided, is suitable for either floor or ceiling mounting. Note that each mounting bracket is to be attached at the top of the heating housing by two holding bolts (see Fig.1). Remove the two bolts and install the first mounting bracket prior to removing the second two bolts to install the second mounting bracket. If all bolts are removed at once the tank may shift which will increase installation time.

2.5Please refer to Figure 1 for dimensions. Be sure to provide adequate space to facilitate installation and maintenance. Leave a minimum of 24" (60cm) clearance at the control compartment (opposite side to the inlet). If the unit is to be mounted under a table or cabinet a minimum of 30" (75cm) from the floor to the underside of the cabinet is required for piping.

2.6Allow space at sides for the conduit used for power supply and for thermostat or optional equipment wiring.

2.7Please refer to Figure 2 for component location and note the following:

2.7.1The circulation pump outlet is connected to the heater inlet located at the end of the unit opposite to the controls compartment.

2.7.2A flow switch (optional) is to ensure that the heater will not be energized if the flow is interrupted. Installations requiring a flow switch include:

(a)Swimming pool heating systems where the heater is positioned above the pool water surface.

(b)Whenever the plumbing allows for the heater to be isolated by shut off valves on the inlet and outlet.

(c)Systems where the heater vessel is allowed to drain when flow is interrupted. (Without water the built-in limit will not perform as intended).

(d)Systems where the temperature control bulb is located away from the outlet.

If a flow switch is not used, and also for pool heating, it is best to allow the circulating pump to run continuously.

2.7.3Wire both flow switch and control thermostat to contacts designated "normally open" and "common". "Normally open" contacts open on temperature rise on thermostat and close on flow through switch.

2.7.4A pressure relief valve is a safety feature which is intended to open when the system malfunctions or is improperly operated or maintained. Units equipped with a pressure relief valve should be fitted with piping to direct the discharge down and away from personnel or equipment.

NEVER INSTALL A SHUT OFF VALVE ON EITHER SIDE OF A PRESSURE RELIEF VALVE.