Roberts Gorden System Control HP 120 V 1 Guide

WARNING
Installation must be done by a contractor qualified
in the installation and service of gas-fired heating
equipment or your gas supplier.
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or
property damage. Read the Installation, Operation
and Service Manual thoroughly before installing or
servicing this equipment.
Installer
Please take the time to read and understand
these instructions prior to any installation.
Installer must give a copy of this manual to the owner.
Owner
Keep this manual in a safe place in order to provide
your serviceman with necessary information.
Roberts-Gordon LLC
1250 William Street
P. O . B o x 4 4
Buffalo, New York 14240-0044
Telephone: [phone]
Fax: [phone]
Toll Free: 800.828.7450
www.rg-inc.com
www.radiantheaters.com
© 2009 Roberts-Gordon LLC P/N 10091601NA Rev. H 04/09
System Control
Installation, Operation &
Service Manual

© 2009 Roberts-Gordon LLC
All rights reserved. No part of this work covered by the copyrights herein may be reproduced
or copied in any form or by any means - graphic, electronic, or mechanical, including
photocopying, recording, taping or information storage and retrieval systems - without the
written permission of Roberts-Gordon LLC.
TABLE OF CONTENTS
SECTION 1: Introduction........................................................1
1.1 Safety ........................................................................... 1
1.2 What is a ROBERTS GORDON®System Control? ......1
1.3 Electrical Requirements ............................................... 1
1.4 Check Installation Materials ......................................... 1
SECTION 2: Specifications .................................................... 3
2.1 Material Specifications.................................................3
2.2 Electrical Specifications...............................................3
2.3 Pump Specifications .................................................... 3
2.4 Burner Electrical Ratings .............................................4
2.5 Outside Air Supply Blower Electrical Ratings ..............4
2.6 Indicator Lights ............................................................ 4
2.7 Terminal Block Guide...................................................4
SECTION 3: Installation.......................................................... 5
3.1 Preparation .................................................................. 5
3.2 Installing the System Control Panel .............................5
3.3 Select the External Wiring Diagram for the
Installation....................................................................5
3.4 System Configuration...................................................6
SECTION 4: Typical External WiringDiagrams ....................7
4.1 EP-100 or EP-201 120 V 1 Ø Pump External
Wiring Diagram............................................................ 7
4.2 EP-201 or EP-301 230 V 1 Ø External
Wiring Diagram............................................................ 8
4.3 EP-203 or EP-303 208 - 230 V (or 460 V) 3 Ø Pump
External Wiring Diagram.............................................. 9
4.4 Outside Air Blower External Wiring Diagram ............. 10
SECTION 5: Troubleshooting............................................... 12
5.1 Sequence of Operation.............................................. 12
SECTION 6: Replacement Parts .......................................... 14
6.1 Replacement Parts Instructions................................. 15
SECTION 7: The ROBERTS GORDON®System Control
Warranty ........................................................... 17
Printed in U.S.A.

TABLE OF FIGURES
Figure 1: Panel Layout ..............................................................3
Figure 2: Terminal Block Guide ................................................. 4
Figure 3: Mounting Hole Layout................................................ 5
Figure 4: System Configuration................................................. 6
Figure 5: External Wiring Diagram ROBERTS GORDON®
EP-100 and EP-201 120 V 1 Ø Pump ........................ 7
Figure 6: External Wiring Diagram ROBERTS GORDON®
EP-100, EP-201 or EP-301, 230 V 1 Ø Pump ............8
Figure 7: External Wiring Diagram ROBERTS GORDON®
EP-203 or EP-303, 208 - 230 V (or 460 V)
3 Ø Pump................................................................... 9
Figure 8: External Wiring Diagram ROBERTS GORDON®
EP-100 or EP-201 120 V 1 Ø Pump with Outside
Air Blower ................................................................ 10
Figure 9: System Control Troubleshooting Chart .................... 13
Figure 10: System Control Internal Components Diagram ...... 14

SECTION 1: INTRODUCTION
1
SECTION 1: INTRODUCTION
1. 1 S a f et y
Yo ur Safety is Important to Us! This
symbol is used throughout the
manual to notify youof possible
fire, electrical or burn hazards.
Please pay special attention when
reading and following the warnings.
Installation, service and annual inspection of
controller must be done by an electrician qualified in
the installation and service of control systems for
heating equipment.
Installation, service and annual inspection of heater
must be done by a contractor qualified in the
installation and service of gas or oil fired heating
equipment.
Read this manual carefully before installation,
operation, or service of this equipment.
For optimum heater performance and safe heating
conditions, inspect and maintain heater(s) before
every heating season as necessary. Also, knowand
maintain heater clearances to combustibles, see
heater Installation, Operation and Service Manual for
further details. If yourequire additional manuals, con-
tact your ROBERTS GORDON®independent distrib-
utor or Roberts-Gordon LLC at [phone], (800)
828-7450 or online at www.rg-inc.com.
1.2 What is a ROBERTS GORDON®System
Control?
The ROBERTS GORDON®System Control is an
electronic controller designed for the control of
CORAYVAC®and VANTAGE®NP (multiburner only)
systems.
The System Control is capable of giving four zones of
burners' temperature control and power. The control
will also give power output to as many as two pumps,
provided that the load is not greater than 20 A and 1
Ø. For additional electrical specifications see Page 3,
Section 2.2.
1.3 Electrical Requirements
Failure to comply with the installation instructions will
invalidate the limited warranty set out on Page 17,
Section 7.
The cable used for all wiring must be rated for 600 V.
The system control, burners, pump and outside air
blower must be electrically grounded in accordance
with the following:
United States: Refer to National Electrical Code®,
NFPA 70 - latest revision. Wiring must conform to the
most current National Electrical Code®, local ordi-
nances and any special diagrams furnished.
Canada: Refer to Canadian Electrical Code, CSA
C22.1 Part 1 - latest revision.
1.4 Check Installation Materials
Before proceeding with the installation of the
ROBERTS GORDON®System Control, check the fol-
lowing points:
1.4.1 Thermostats
Electronic 24 Vac thermostats and mechanical ther-
mostats with heat anticipator can be used. The sys-
tem control offers a 24 Vac power supply to power
electronic thermostats.
Roberts-Gordon offers a selection of lowvoltage
thermostats approved for use with the system con-
trol.
The thermostats measure the air temperature in the
building. It is important that the thermostat is located
in an area within the heated zone at occupant level.
Do not place thermostat in an area shaded from the
low-intensity, infrared heating system.
DANGER
Electrical Shock Hazard
Disconnect electric before service or
maintenance.
Control must be connected to a properly
grounded electrical source.
Failure to follow these instructions can
result in death or electrical shock.

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
2
1.4.2 Electrical Installation Materials
120 V, 60 Hz, 1 Ø, 20 A, power supply to the control
panel must be installed in accordance with the most
current National Electrical Code®, local codes and
any site specific diagrams.
Total load powered by the panel must not exceed
20 A. Loads totaling more than 20 A must be
powered from an additional power supply circuit by
the use of a load relay package.
1.4.3 Outside Air Supply Blower
If used, the optional outside air blower is to be con-
trolled in parallel with the pump. The blower incorpo-
rates a pressure switch which must be wired in series
with the pressure switch on the pump. The load relay
package may be required with the blower. See Page
10, Figure 8 for wiring detail.
1.4.4 Pressure Switch
A pressure switch (P/N 90430600K), is required for
installation on the inlet of the pump. This switch is
required to interlock the operation of the pump with
the control panel.
CAUTION
Product Damage Hazard
Pressure switch must be installed on all
ROBERTS GORDON®systems to ensure
safety and operation.
System will not operate without pressure
switch.
Failure to follow these instructions can result
in product damage.

SECTION 2: SPECIFICATIONS
3
SECTION 2: SPECIFICATIONS
FIGURE 1: Panel Layout
2.1 Material Specifications
Enclosure Material: Metal
Weight: 6.8 lbs
Dimensions: 10.2" x 11.4" x 2.8"
(25.4 x 29.0 x 7.1 cm)
Protection: Rating IP20
2.2 Electrical Specifications
Supply: 120 V, 60 Hz, 1 Ø, 20 A
Zone Relay: Single pole 20 A, 120 Vac
(resistive)
Pump Relay: Single pole 20 A, 120 Vac
(resistive) 1 HP motor rated.
Thermostats: Lowvoltage 24 Vac
2.3 Pump Specifications
Full Load Current
Pump Model HP 120 V 1 Ø 208/230 V 1 Ø 208/230 V 3 Ø 460 V 3 Ø
EP-100 1/3 4.8 A N/A / 2.4 A - -
EP-201 3/4 6.6 A N/A / 3.3 A - -
EP-203 3/4 - - 2.4 A / 2.2 A 1.1 A
EP-301 2 23 A 12.8 A / 11.9 A - -
EP-303 2 - - 5.5 A / 5.2 A 2.6 A

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
4
2.4 Burner Electrical Ratings
CORAYVAC®burners: 120 V, 60 Hz, 1 Ø 0.3 A
VANTAGE®NP (multiburner only) burners:120 V, 60
Hz, 1 Ø 0.2 A
2.5 Outside Air Supply Blower Electrical Ratings
Outside air supply blower (P/N 90707501) has a full
load rating of 1.6 A when supplied by a 120 V, 60 Hz, 1
Ø power source.
2.6 Indicator Lights
See Page 3, Figure 1.
1. LINE POWER, when lit, indicates power is
supplied to the panel.
2. PUMP POWER 1, when, lit, indicates the relay
for power to pump 1 is energized.
3. PUMP POWER 2, when, lit, indicates the relay
for power to pump 2 is energized.
4. PRESSURE SWITCH 1, when lit, indicates that
pressure switch 1 is closed. When blinking, indi-
cates that the system is in lockout.
5. PRESSURE SWITCH 2, when lit, indicates that
pressure switch 2 is closed. When blinking, indi-
cates that the system is in lockout.
6. ZONE, when lit, indicates which zone relay is
energized.
2.7 Terminal Block Guide
Figure 2 is a guide to the terminal abbreviations.
FIGURE 2: Terminal Block Guide
G
NEUTRAL LINE
NLNLNLNLNLNLNL
NEUTRAL LINE NEUTRAL LINE NEUTRAL LINE NEUTRAL LINE NEUTRAL LINE NEUTRAL LINE GROUND
POWER
SUPPLY
PUMP 1 ZONE 1
BURNERS
PUMP 2ZONE 2
BURNERS
ZONE 3
BURNERS
ZONE 4
BURNERS
24 VAC
COM
AIR SW1 ZONE 1 W ZONE 2 W ZONE 2 W ZONE 2 W AIR SW2
24 VAC
COM
AIR SW1
ZONE 1 R ZONE 2 R ZONE 2 R ZONE 2 R
AIR SW2

SECTION 3: INSTALLATION
5
SECTION 3: INSTALLATION
Installation of the System Control and the associated
external electrical wiring must be completed by an
electrician qualified in the installation of control
systems for heating equipment.
3.1 Preparation
Before installing the System Control, observe the
following:
3.1.1 Ensure that youhave a copy of the site layout
for the project that identifies clearly the separate
zones.
3.1.2 Read Page 1, Section 1.4 carefully to ensure
the correct installation materials are available.
3.2 Installingthe System Control Panel
3.2.1 Choose a mounting location for the System
Control. It is advisable to choose a visible location
near the pump.
Do not mount System Control outdoors or in an
area with moisture spray, excessive moisture or
humidity. To avoid damage from possible drips,
do not mount controller directly beneath pump.
3.2.2 Remove the cover of the System Control by
removing the four securing screws.
3.2.3 Place the cover and the hardware in a safe
place for refitting after the external wiring connections
have been made.
3.2.4 Position the mounting hole location of the Sys-
tem Control per Figure 3.
3.2.5 Remove the knockouts required for the conduit
entry into the System Control panel. The knockouts
are on the top of the system control case. If the
knockouts are required to be on the bottom the case
can be rotated 180°.
3.2.6 When the case is rotated 180°, the LED status
circuit card needs to be rotated so that the LED's
match the upright cover panel. Remove the LED sta-
tus circuit card by squeezing each standoff gently
with pliers one at a time until it is loose. Rotate the
circuit card so that it will line up with the upright cover
and re-attach to the standoffs. The ribbon cable that
connects the LED status circuit card to the circuit
card assembly will have a twist in it. Use caution not
to cause any creases or put any tension to the ribbon
cable when rotating the circuit card.
FIGURE 3: MountingHole Layout
3.3 Select the External WiringDiagram for the
Installation
3.3.1 Use Page 7, Section 4 for the external wiring of
the burners, thermostats and pressure switch.
3.3.2 Use the table belowto select the correct pump
external wiring diagram.
Roberts-Gordon LLC provides, at an additional
cost, the following IEC contactor packages required
for EP-100 and EP-201 208/230 V (1 Ø), EP-203 (3
Ø), EP-303 (3 Ø) and EP-301 (1 Ø) pumps.
DANGER
Electrical Shock Hazard
Disconnect electric before service or
maintenance.
Control must be connected to a properly
grounded electrical source.
Failure to follow these instructions can
result in death or electrical shock.
Pump Supply VoltagePageSection Figure
EP-100 120 V 1 Ø 7 4 5
EP-100 208/230 V 1 Ø 8 4 6
EP-201 120 V 1 Ø 7 4 5
EP-201 208/230 V 1 Ø 8 4 6
EP-301 120/208 - 230 V 1 Ø 8 4 6
EP-203 208 - 230 V (or 460 V) 3 Ø 9 4 7
EP-303 208 - 230 V (or 460 V) 3 Ø 9 4 7
10.0" (254 mm)
4.5" (114 mm)
4 x Ø 0.360" (9 mm)

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
6
For the EP-203 (3 Ø), EP-303 (3 Ø), EP-100, EP-201
and EP-301 208/230 V (1 Ø) pumps, use the 17 Amp
contactor package (P/N 10050011).
For the EP-301 pumps that are operated with 120 V
(1 Ø) use the 28 Amp contactor package (P/N
10050012). The contents are listed below:
All pump motors are equipped with thermal
overloads.
3.3.3 If an outside air blower is to be used with any of
the above options, See Page 10, Figure 8.
3.4 System Configuration
See Page 6, Figure 4 for details. Belowthe ribbon
cable J2 connector, there are six configurable jump-
ers. They indicate whether the thermostat for each
zone uses an anticipator. If the thermostat for that
associated zone has an anticipator, then use a
jumper to cover both pins for that zone. If the thermo-
stat for the associated zone does not use an antici-
pator, then cover the right side pin only.
The bottom two jumpers are associated with Pump 2
operation. They indicate whether Pump 2 is active
and which zones are associated with it. Pump 2 can
only be associated with Zone 3 and/or Zone 4. To
enable Pump 2, use a jumper to cover both pins for
the zone(s) that will operate on Pump 2. To disable
Pump 2, cover only the right side of the pin of zone 3
and 4.
FIGURE 4: System Configuration
Contactor Packages
Part No.
Description
10050011 Contactor Package 17A
10001002 Enclosure IEC metal 8X6X6 NEMA 1
90600200 CONT 208-600 17A (A16-30-10-84)
10050012 Contactor Package 28A
10001002 Enclosure IEC metal 8X6X6 NEMA 1
90600205 CONT 208-600 28A (A26-30-10-84)
GNLNLNLNLNLNLNL
AC POWER INPUMP 1 ZONE 1 PUMP 2ZONE 2 ZONE 3 ZONE 4
24 VAC
COM
Z1W Z2W Z3W Z4W
24 VAC
COM
Z1R Z2R Z3R Z4R
AIR
SW1
AIR
SW2
AIR
SW1
AIR
SW2
ANTICIPATOR
LOAD ENABLE
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 3
ZONE 4
PUMP 2
OPERATION
ENABLE
ANTICIPATOR
LOAD ENABLE
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 3
ZONE 4
PUMP 2
OPERATION
ENABLE
FEATURE
ENABLED
FEATURE
DISABLED

SECTION 4: TYPICAL EXTERNAL WIRING DIAGRAMS
7
SECTION 4: TYPICAL EXTERNAL WIRING
DIAGRAMS
4.1 EP-100 or EP-201 120 V 1 Ø Pump External
WiringDiagram
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
belowshows 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 lowvoltage circuit conforms with Class 2 separa-
tion of circuit requirements. National Electrical Codes®
for wiring class 2 lowvoltage circuits must be followed.
FIGURE 5: External WiringDiagram 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 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 1POWER
SUPPLY
NL
Z1 Z2 Z3 Z4
NNNNLLLL
All burners must be
connected to Ground
(Not shown)
Zone 1 Zone 2 Zone 3 Zone 4
EP-100 or
EP-201 Pump
NL
EP-100 or
EP-201 Pump
L
N
TWO PUMP SYSTEM (optional)
Pump 1 may be used for all zones.
Pump 2 may be 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

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
8
FIGURE 6: External WiringDiagram ROBERTS GORDON®EP-100, EP-201 or EP-301, 230 V 1 Ø Pump
4.2 EP-201 or EP-301 230 V 1 Ø External Wiring
Diagram
The external wiring diagram above shows the
connections for four zones of system burners.
System burners can be either CORAYVAC®or VAN-
TAG E ®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 301 or EP-201 1 Ø
pump.
4.2.1 External Wiring Connection Details
The cable used for all the wiring must be rated for
line voltage up to 600 Vac.
The lowvoltage circuit conforms with Class 2 separa-
tion of circuit requirements. National Electrical Codes®
for wiring class 2 lowvoltage circuits must be followed.
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
NL
Z1 Z2 Z3 Z4
NNNNLLLL
All burners must be
connected to Ground
(Not shown)
Zone 1 Zone 2 Zone 3 Zone 4
EP-100,
EP-201 or
EP-301 Pump
NL
L
N
TWO PUMP SYSTEM (optional)
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 2
Pressure
switch
located at
pump 1
208- 230 V
1 Ø
60 Hz
L2
L1
M
1
5
3
2
64
Individual supply for
pump rated for total full
load current. See Section
2.3 for details.
EP-100, EP-201 or
EP-301 Pump
The power supply for the
pump must be separate
from the controller supply
Motor Contactors
P/N10050011
P/N10050012
CAUTION
Product Damage Hazard
Do not directly connect control relay terminals
to pump motor.
Failure to follow these instructions can result
in product damage.

SECTION 4: TYPICAL EXTERNAL WIRING DIAGRAMS
9
FIGURE 7: External WiringDiagram 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 WiringDiagram
The external wiring diagram above shows the
connections 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-203 or EP-303 3 Ø
pump.
4.3.1 External Wiring Connection Details
The cable used for all the wiring must be rated for
line voltage up to 600 Vac.
The lowvoltage circuit conforms with Class 2 separa-
tion of circuit requirements. National Electrical Codes®
for wiring class 2 lowvoltage circuits must be followed.
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
NL
Z1 Z2 Z3 Z4
NNNNLLLL
All burners must be
connected to Ground
(Not shown)
Zone 1 Zone 2 Zone 3 Zone 4
EP-203 or
EP-303 3 Ø
Pump
NL
L
N
208- 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 be separate
from the controller supply
TWO PUMP SYSTEM (optional)
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 2
Pressure
switch
located at
pump 1
Motor Contactors
P/N10050011
P/N10050012
CAUTION
Product Damage Hazard
Do not directly connect control relay terminals
to pump motor.
Failure to follow these instructions can result
in product damage.

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
10
FIGURE 8: External WiringDiagram ROBERTS GORDON®EP-100 or EP-201 120 V 1 Ø Pump with Out-
side Air Blower
4.4 Outside Air Blower External WiringDiagram
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
NL
Z1 Z2 Z3 Z4
NNNNLLLL
All burners must be
connected to Ground
(Not shown)
Zone 1 Zone 2 Zone 3 Zone 4
Pump
Pump
NL
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/N05023000)
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

SECTION 4: TYPICAL EXTERNAL WIRING DIAGRAMS
11
load relay to the optional outside air blower.
4.4.1 External Wiring Connection Details
The cable used for all the wiring must be rated for
line voltage up to 600 V.
The lowvoltage circuit conforms with Class 2
separation of circuit requirements. National Electrical
Codes®for wiring class 2 lowvoltage circuits
must be followed.

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
12
SECTION 5: TROUBLESHOOTING
5.1 Sequence of Operation
a. On demand for heat from the thermostat, the
panel will send power to the pump. The pump
will begin operation.
b. Once vacuum is established, the pressure
switch at the pump will close. If the vacuum is
not established within 30 seconds the pump
will go into lockout (pump LED is flashing).
After one hour of lockout, the system will re-
start.
c. The System Control panel sends power to the
burners. The burners will go through a 45
second purge and cycle time.
d. Once flame is established, the heater will
remain in operation until such time as either
the heating is turned off by the thermostat,
lockout conditions occur, or after 24 hours of
continuous operation. After 24 hours of con-
tinuous operation, the system control will shut
off and re-start to verify no faults exist in the
system.
e. After the heating is turned off, the pump will
continue operation for 2 minutes, post purge.
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.
WARNING
Explosion Hazard
Turn off gas supply to equipment before
service or maintenance.
Failure to follow these instructions can result
in death, injury or property damage.

SECTION 5: TROUBLESHOOTING
13
FIGURE 9: System Control TroubleshootingChart
Contact
Roberts-Gordon LLC
at www.rg-inc.com.
Contact
Roberts-Gordon LLC
at www.rg-inc.com.
Contact
Roberts-Gordon LLC
at www.rg-inc.com.
Contact
Roberts-Gordon LLC
at www.rg-inc.com.
Tro ubleshoot ends.
Contact
Roberts-Gordon LLC
at www.rg-inc.com.
Does the pump turn off
following post purge period? No
Ye s
Do the burners turn off
when the thermostat is
satisfied?
No
Ye s
Rectify.
Do the burners in the
zone come on? NoHas the system been commissioned? No
Ye s
Is external wiring to the
zone OK? Ye s
No
Refer to burner trouble-
shooting in either the
CORAYVAC
®
or
VANTAG E
®
NP
Installation, Operation and
Service Manuals.
Refer to the burner start up
instructions in either the CORAYVAC
®
or VANTAG E
®
NP Installation, Operation
and Service Manuals.
Do the incorrect zone
lights or all zone
lights come on? Ye s
No
Are the zone thermostats
wired correctly? No
Ye s
Rectify.
Is external wiring to the
pressure switch OK? Ye s
No
Rectify.
Rectify.
Ye s
No
Is the correct contactor
selected for the
pump?
Adjust thermostat set
point to call for heat.
Does the pump
come on?
No
Ye s
Does the zone light
come on?
Ye s
No
No
Ye s
Ye s
No
Is external wiring to the
pump OK?
Fit the correct contactor.
Is the thermostat connected
to the correct terminal at the
system control.
Ye s
Replace fuse with
P/N10000212.
Is the line power
indicator on?
Check the power supply
to the system control
panel. Is it on?
Ye s
Ye s Check the 250mA
fuse. Is it OK? Ye s
No
No
Rectify power supply
problem.
No
No
Does the pressure switch
light come on?
Refer to burner trouble-
shooting in either the
CORAYVAC
®
or
VANTAG E
®
NP
Installation, Operation and
Service Manuals.
Refer to burner trouble-
shooting in either the
CORAYVAC
®
or
VANTAG E
®
NP
Installation, Operation and
Service Manuals.
Turn off power and correct
wiring.
Ye s
Contact
Roberts-Gordon LLC
at www.rg-inc.com.
If control is not working properly, disconnect power to control and check for signs
of physical damage to the front and back of the circuit board, water damage (cor-
rosion) or scorching. If damage is found, identify and rectify source of
damage. Replace circuit board (P/N 10090101), if it has permanent damage.

SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
14
SECTION 6: REPLACEMENT PARTS
FIGURE 10: System Control Internal Components Diagram
Item Description Part Number
1 Fuse 250 mA 10000212
2 Transformer N/A
4Board Assembly 10090101
Carbon Monoxide Hazard
WARNING
Use only genuine ROBERTS GORDON®replacement parts per this installation, operation and
service manual.
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Explosion Hazard
DANGER
Electrical Shock Hazard Fire Hazard
GNLNLNLNLNLNLNL
AC POWER INPUMP 1 ZONE 1 PUMP 2ZONE 2 ZONE 3 ZONE 4
24 VAC
COM
Z1W Z2W Z3W Z4W
24 VAC
COM
Z1R Z2R Z3R Z4R
AIR
SW1
AIR
SW2
AIR
SW1
AIR
SW2
1
2
4