SECTION 4: T
YPICAL
E
XTERNAL
W
IRING
D
IAGRAMS
9
FIGURE 7: External Wirin
g
Dia
g
ram ROBERTS GORDON
®
EP-203 or EP-303, 208 - 230 V (or 460 V)
3 Ø Pump
4.3 EP-203 or EP-303 208 - 230 V (or 460 V) 3 Ø
Pump External Wirin
g
Dia
g
ram
The external
w
iring diagram abo
v
e sho
w
s the
connections 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
abo
v
e sho
w
s connection to an EP-203 or EP-303 3 Ø
p
u
mp.
4.3.1
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.
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-203 or
EP-303 3 Ø
Pump
N
L
L
N
20
8
- 230 V
(or 460 V)
3
Ø
60 Hz
Individual supply
for pump rated for
total full load current.
See Section 2.3
for details.
EP-203 or
EP- 303 3 Ø Pump
M
L1
L3
L2
The power supply for the
pump must
b
e separate
from the controller supply
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. Refer to Pump 1 for configuration.
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
Motor Contactors
P/
N
10050011
P/
N
10050012
CAUTION
Product Damage Hazard
Do not directly connect control relay terminals
to pump motor.
Failure to follow these instructions can result
in product damage.
Summary of Contents for System Control
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