Thomas & Betts EPW User's Manual
Contents
1. circulator pump optional feature Inlet 14 NPT drain valve 14 p Ft not supplied to drain 2 7 5 Optional expansion tank for closed loop systems is mounted in the outlet piping 2 7 6 A 1 1 2 NPT drain plug is fitted at the bottom of the heater We recommend use of a drain valve to simplify clean out of sludge which may accumulate in the vessel Sludge build up can cause heating element failure 2 7 7 For flow rates greater than 50 gpm to reduce tank erosion a bypass loop with regulating valve is recommended 2 7 8 Closed loop systems require an air bleed valve preferably installed at the highest point in the piping loop 3 0 START UP AND OPERATION 3 1 The EPW heater is designed to heat water in a non hazardous environment In some closed loop systems chemically stabilized ethylene glycol may be added to the water for freeze protection or to elevate the boiling point If you are unsure as to suitability of glycol to your heating loop contact the factory 3 2 Check the electrical system for loose connections and tighten if required N B WHERE THERMOSTAT BULB IS LOCATED OTHER THAN OUTLET FLOW SWITCH IS RECOMMENDED 3 3 After all piping is installed turn the thermostat to its lowest setting and operate the circulating pump for up to 1 2 hour to check for leaks and to remove air pockets In closed loop systems use the air bleed valve to remove entrapped air An air lock in the heater vessel could cau2. 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 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 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 1 1 2 INLET Figure 2 TYPICAL INSTALLATION flow switch optional pressure temperature rp 1 N P T air vent relief valve TS v not supplied 3 4 N P T pressure temp he Pe 1 8 N P T gauge TF S 1 2 N P T yes High Limit Reset Button leave a inet Thermostat bulb 24 60 em location in outlet clearance on this side for access Control Fuse to controls knockout for supply wiring
3. GdF 4 10 Thomas Betts Applies to Heater Model EPW Installation Operation Maintenance Form MI511 1 0 INITIAL INSPECTION 1 1 Upon receipt from the carrier inspect the heater for possible damage in transit If necessary immediately report damage to shipping company 1 2 Verify that the nameplate voltage phase wattage and catalog number comply with the order 1 3 The EPW when configured e as a Swimming pool heater has a catalog number EPWP e as a domestic water or dishwasher water booster heater has a catalog number EPWD e as a hot water furnace for comfort or process water heating has a catalog number EPWH 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 0 INSTALLATION 2 1 The heater must be installed by qualified personnel to code requirements 2 2 Ensure that the electrical power supply is the same voltage and phase as the heater with sufficient current capacity 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
4. be corrected 4 0 MAINTENANCE 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 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 Figure 3 Wiring Diagram 16 ty s o N To Remote Thermostat supplied loose T2 FT F2 J Ea AG amp Built in A High Limit To Elements N B REMOVE JUMPER IF OPTIONAL FLOW SWITCH IS USED J i r Ko i i aS ie IKEa iy i N Figure 4 Accessories Protective Well CWI 6 1 2 NPT Bile 5 1 5m Capillary Thermostat 11B06 1 Control Circuit Fuse 208 amp 240V 2 x MDA 3 3 AMP 277 to 600V 1 x MDA 5 5 AMP TYPE F61KB FLOW SWITCH Optional li
5. install the second mounting bracket If all bolts are removed at once the tank may shift which will increase installation time 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 Electric Water Circulation Heater Figure 1 DIMENSIONS 29 3 4 R HOLDING BOLTS FOR BRACKET A 1 2 OUTLET om wo AA eee 15 rs 22 1 2 2 ae 7 7 CY VR 1 5 l 103 4 Knockouts 1 O 11 4 11 282 11 2 DRAIN 71 2 71 2 ia 16 1 4 4 be 15 2 6 Allow space at sides for the conduit used for power supply and for thermostat or optional equipment wiring OO 7 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 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 b Whenever
6. se the heaters to run dry and fail prematurely 3 4 Set the thermostat to the desired temperature The temperature rise through the unit will depend on the flow rate and the heater kilowatt kw rating 6 83 kw For water GPMy Temp Rise F Example For a 30 kw heater and a 10 F temperature rise the flow required in U S gallons per minute is 6 83 30 10 Adjust the thermostat differential to give the desired cycling rate It is best to use the maximum acceptable differential so as to minimize cycling and prolong component service life However if the system requires close control a narrow differential setting will be necessary GPM 20 4 3 5 For systems using a by pass loop open the by pass valve to reduce the load on the pump but not enough to cause the limit thermostat to open For pool heating the ideal by pass opening will result in water leaving the heater at not more than 90 F Disconnect Switch not supplied 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 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
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