Section 4: Typical External Wiring Diagrams; Ep-100 Or Ep-201 120 V 1 Ø Pump External Wiring Diagram; Figure 5: External Wiring Diagram Roberts Gordon - Roberts Gorden System Control HP 120 V 1 Installation & Operation Manual

SECTION 4: TYPICAL EXTERNAL WIRING
DIAGRAMS
DANGER
Electrical Shock Hazard
Disconnect electric before service or
maintenance.
More than one disconnect switch may be
required to disconnect electric to the unit.
Failure to follow these instructions can result
in death or electrical shock.

FIGURE 5: External Wiring Diagram ROBERTS GORDON

EP-100 or
EP-201 Pump
120 V
1 Ø
120 V
60 Hz
1 Ø
60 Hz
L
N
Ground
POWER
SUPPLY
All burners must be
connected to Ground
(Not shown)
Zone 1 Zone 2 Zone 3 Zone 4
N L N L N L
N L
Z3
Z1 Z2
PUMP 1
System Control
4.1 EP-100 or EP-201 120 V 1 Ø Pump External
Wiring Diagram
The external wiring diagram above shows the con-
nections for four zones of system burners. System
burners can be either CORAYVAC
(multiburner only).
The zones are connected to a single pump, unless
zone 3 and/or zone 4 are selected to function with
the optional pump 2. The external wiring diagram
below shows connection to an EP-100 or EP-201 120
V 1 Ø pump.
4.1.1 External Wiring Connection Details
The cable used for all the wiring must be rated for
line voltage up to 600 Vac.
The low voltage circuit conforms with Class 2 separa-
tion of circuit requirements. National Electrical Codes
for wiring class 2 low voltage circuits must be followed.
EP-100 and EP-201 120 V 1 Ø Pump
®
EP-100 or
TWO PUMP SYSTEM (optional)
EP-201 Pump
Pump 1 may be used for all zones.
Pump 2 may be used to control
zone 3 and/or zone 4.
Pressure
switch
located at
Pump 1
24 VAC
24 VAC PS 1
N L N L
COM
Z4
PUMP 2
24 VAC PS 1
COM
SECTION 4: T E W
YPICAL XTERNAL
or VANTAGE
®
Low voltage thermostats
located in heated zone
Zone Zone Zone Zone
4
1 2 3
R R R R
W W W W
D
IRING IAGRAMS
NP
®
®
Pressure
switch
located at
Pump 2
PS 2
PS 2
7