SECTION 4: T
YPICAL
E
XTERNAL
W
IRING
D
IAGRAMS
7
SECTION 4: TYPICAL EXTERNAL WIRING
DIAGRAMS
4.1 EP-100 or EP-201 120 V 1 Ø Pump External
Wirin
g
Dia
g
ram
The external
w
iring diagram abo
v
e sho
w
s the con-
nections for fo
u
r zones of system b
u
rners. System
b
u
rners can be either CORAYVAC
®
or VANTAGE
®
NP
(m
u
ltib
u
rner only).
The zones are connected to a single p
u
mp,
u
nless
zone 3 and/or zone 4 are selected to f
u
nction
w
ith
the optional p
u
mp 2. The external
w
iring diagram
belo
w
sho
w
s connection to an EP-100 or EP-201 120
V 1 Ø p
u
mp.
4.1.1
External Wiring Connection Details
The cable
u
sed for all the
w
iring m
u
st be rated for
line
v
oltage
u
p to 600 Vac.
The lo
w
v
oltage circ
u
it conforms
w
ith Class 2 separa-
tion of circ
u
it req
u
irements. National Electrical Codes
®
for
w
iring class 2 lo
w
v
oltage circ
u
its m
u
st be follo
w
ed.
FIGURE 5: External Wirin
g
Dia
g
ram ROBERTS GORDON
®
EP-100 and EP-201 120 V 1 Ø Pump
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.
System Control
R
R
R
R
PS 2
PS 1
24
V
AC
COM
24
V
AC
COM
PS 1
PS 2
W
W
W
W
24 VAC
120 V
1
Ø
60 Hz
Ground
G
L
N
120 V
1
Ø
60 Hz
PUMP 2
PUMP 1
PO
W
ER
SUPPLY
N
L
Z1
Z2
Z3
Z4
N
N
N
N
L
L
L
L
All
b
urners must
b
e
connected to Ground
(
N
ot shown)
Zone 1 Zone 2 Zone 3 Zone 4
EP-100 or
EP-201 Pump
N
L
EP-100 or
EP-201 Pump
L
N
T
W
O PUMP SYSTEM (optional)
Pump 1 may
b
e used for all zones.
Pump 2 may
b
e used to control
zone 3 and/or zone 4.
Low voltage thermostats
located in heated zone
Zone
1
Zone
2
Zone
4
Zone
3
Pressure
switch
located at
Pump 2
Pressure
switch
located at
Pump 1
Summary of Contents for System Control
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