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SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
10
FIGURE 8: External Wiring Diagram ROBERTS GORDON
®
EP-100 or EP-201 120 V 1 Ø Pump with Out-
side Air Blower
4.4 Outside Air Blower External Wiring Diagram
The external wiring diagram above shows the con-
nections for four zones of system burners. System
burners can be either CORAYVAC
®
or VANTAGE
®
NP
(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
above shows connection to an EP-100 or EP-201 1 Ø
motor. The diagram also shows the connection via a
System Control
R R R R PS 2PS 124 VAC
COM
24 VAC
COM
PS 1 PS 2WWWW
24 VAC
120 V
1 Ø
60 Hz
Ground
G
L
N
120 V
1 Ø
60 Hz
PUMP 2PUMP 1
POWER
SUPPLY
N
L
Z1
Z2
Z3 Z4
N
N
N
NLL
L
L
All burners must be
connected to Ground
(Not shown)
Zone 1
Zone 2 Zone 3 Zone 4
Pump
Pump
N
L
L
N
120 V
1 Ø
60 Hz
L
N
Outside Air
Blower
Outside Air
Blower
CR
Coil connections
to Pump L & N
Outputs from
Control Panel
Live out to the
outside air
blower
Live in
Typical wiring for Load Relay
Package (P/N 05023000)
Relay Receptacle
Back Plate
Coil
Coil
4
1
5
2
6
3
TWO PUMP SYSTEM (optional)
Optional power supply for Outside Air Blower
Pump 1 may be used for all zones.
Pump 2 may be 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 1
Pressure switch
located at outside air
blower
Pressure switch
located at pump 2
Pressure switch located
at outside air blower