Service manual

EP-300 SERIES PUMP INSTALLATION, OPERATION AND SERVICE MANUAL
14
SECTION 6: MOTOR WIRING
All wiring must comply with current wiring regulations
and any local regulations which may apply. Always
switch off the supply and disconnect before servicing.
6.1 Prior to Operation
Prior to operation of the pump in the heating system,
operation and proper rotation of the impeller must be
verified. See impeller rotation direction arrow label on
the pump scroll for the correct rotation direction.
The motor must be wired for clockwise or counterclock-
wise rotation as shown on Page 14, Figure 13 and
Page 15, Figure 15.
IMPORTANT: Improper rotation of the impeller will
not produce the vacuum required for proper system
operation.
6.2 EP-301 Wiring
The EP-301 motor is wired for 1 Ø, 230 V,
60 Hz operation.
Wire the pressure switch per the CORAYVAC
®
Installa-
tion, Operation and Service Manual (P/N 127102NA) or
appropriate controller installation manual.
Do not directly connect the controller relay terminals to
the pump motor.
The power to the EP-301 pump is not supplied
by the controller. Power is supplied by a
separate circuit and is switched by the controller
via a contactor with a 120 V AC coil. See Page 14,
Figure 12.
FIGURE 12: EP-301 Contactor Wiring Diagram
FIGURE 13: Impeller Direction Wiring for EP-301
Pump (Clockwise Rotation)
WARNING
Electrical Shock Hazard
Disconnect electrical power and gas supply before
servicing.
This appliance must be connected
to a properly grounded electrical source.
Failure to follow these instructions can result in
death or electrical shock.
230 V
1 Ø
60 Hz
120 V
1 Ø
60 Hz
EP-301
Pump
The power supply for
each pump must be
separate from the
controller supply
Contactor package
P/N 10050009 rated for
the EP 301 pump motor
M
1
5
3
2
64
from
control panel
L
N
Individual supply for pump
rated for total full load current
(See Page 22, Section 10.2 for
details).
Note: Interchange wires 5
and 8 for counterclockwise
rotation.