Thomas Betts Water Heater EPW User Manual

Electric,  
Water Circulation Heater  
Applies to Heater Model EPW  
Installation/Operation/Maintenance Form MI511  
Figure 1  
DIMENSIONS  
1.0 INITIAL INSPECTION  
HOLDING BOLTS  
FOR BRACKET  
29"  
1 1/2" OUTLET  
1.1 Upon receipt from the carrier, inspect the heater  
for possible damage in transit.If necessary, immediately  
report damage to shipping company.  
11 3/4"  
1 1/2" INLET  
1.2 Verify that the nameplate voltage, phase, wattage  
and catalog number comply with the order.  
15"  
22 1/2"  
1.3 The 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.  
10 3/4"  
Knockouts 1",  
1 1/4", 1 1/2 & 2"  
7 1/2"  
1 1/2" DRAIN  
16 1/4"  
7 1/2"  
4"  
15"  
2.6 Allow space at sides for the conduit used for power  
supply and for thermostat or optional equipment wiring.  
These units differ in trim package, i.e.auxiliary controls.  
For this reason IT IS IMPORTANT THAT THE UNITS  
BE USED ONLY FORTHE SPECIFIC APPLICATIONS  
AS STATED ABOVE.  
2.7 Please refer to Figure 2 for component location and note  
the following:  
2.7.1 The circulation pump outlet is connected to the heater  
inlet located at the end of the unit opposite to the controls  
compartment.  
2.0 INSTALLATION  
2.1 The heater must be installed by qualified  
personnel to code requirements.  
2.7.2 A 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.  
2.2 Ensure that the electrical power supply is the  
same voltage and phase as the heater with sufficient  
current capacity.  
(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).  
2.3 The heater must be installed in a horizontal  
position with the outlet at the top and the drain at the  
bottom.  
2.4 The 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.  
(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.  
2.7.3 Wire 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.  
2.5 Please 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.  
2.7.4 A 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.  
 
3.6 The built-in temperature high limit is factory set at  
180°F (82°C).This control works best when it is set about  
40°F (22°C) above the water outlet temperature.To adjust  
the limit control setting remove the small panel on the limit  
control to access the adjustment screw. Under normal  
operation the heater should not cycle on the limit control.  
Figure 4  
Accessories  
Protective Well  
CWI-6  
1/2" NPT  
3.7 If the limit trips it must be manually reset before the  
heater will operate. Prior to reset, the condition(s) which  
caused the trip shall be corrected.  
4.0 MAINTENANCE  
5' (1.5m)  
Capillary  
4.1 Service to the unit shall only be done when the power  
is disconnected at the mains.  
4.2 After the first few days of operation, and periodically  
thereafter, inspect for piping leaks and loose electrical  
connections.  
Thermostat  
11B06-1  
4.3 The EPWD unit, because it is used in an open loop  
water heating system, may be subject to sludge build-up if  
the water is hard and untreated.This unit must be drained  
at regular intervals (depending on water conditions and  
operating time) to remove sludge. Once a year a flange  
heater must be removed and the vessel inspected and  
cleaned as required. Local conditions may cause this  
inspection time to vary.  
Control Circuit Fuse:  
208 & 240V: 2 x MDA 3, 3 AMP,  
277 to 600V: 1 x MDA 5, 5 AMP  
Figure 3  
Wiring Diagram  
3φ  
1φ  
To Remote  
Thermostat  
(supplied loose)  
Disconnect  
Switch  
(not supplied)  
TYPE F61KB FLOW SWITCH  
(Optional)  
N.B.  
REMOVE JUMPER IF OPTIONAL  
FLOW SWITCH IS USED.  
 

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