Thomas & Betts EPW - Manual (Page 3)

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 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
N.B.
REMOVE JUMPER IF OPTIONAL
FLOW SWITCH IS USED.
Disconnect
Switch
(not supplied)
To Remote
Thermostat
(supplied loose)
1 φ
3 φ
Thermostat
11B06-1
Control Circuit Fuse:
208 & 240V: 2 x MDA 3, 3 AMP,
277 to 600V: 1 x MDA 5, 5 AMP
Protective Well
CW
I-6
1/2" NPT
5' (1.5m)
Capillary
Figure 4
Accessories
TYPE F61KB FLOW SWITCH
(Optional)