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.
Содержание System Control
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