Roberts Gorden UltraVac NEMA 4 User Manual
Page 7
SECTION 1: I
NTRODUCTION
1
SECTION 1: INTRODUCTION
1.1 What is ROBERTS GORDON
®
ULTRAVAC™?
The ROBERTS GORDON
®
ULTRAVAC™ is a micro-
processor based control package designed for
modulating control of CORAYVAC
®
heaters based on
outdoor temperatures.
This controller is capable of giving control outputs to
one vacuum pump and three heating zones. The
controller also features inputs which are used for
indoor and outdoor signal condition monitoring.
System status and settings are viewed and altered
from a PC (not supplied) running
ROBERTS GORDON
®
ULTRAVAC™ Software.
1.2 CORAYVAC
®
Design Requirements
CORAYVAC
®
burners shall be CRV B-6, B-8, B-9,
B-10 or B-12 burners.
CORAYVAC
®
systems designed shall have
minimum radiant pipe length and 1.5 - 2.0 feet per
flow unit of tailpipe length.
-OR-
CORAYVAC
®
systems designed shall have
recommended radiant pipe length and 1.2 - 1.5 feet
per flow unit of tailpipe length. See the CORAYVAC
®
Design Manual (P/N 127500NA) for minimum and
recommended radiant pipe length.
1.3 General Requirements
The ROBERTS GORDON
®
ULTRAVAC™ series of
controllers are supplied pre-configured for use with
ROBERTS GORDON
®
CORAYVAC
®
infrared heating
equipment only. Failure to comply with the installation
instructions and configuration may invalidate the
ROBERTS GORDON
®
ULTRAVAC™ limited war-
ranty. See Page 41, Section 10.
ROBERTS GORDON
®
ULTRAVAC™ Software
requires a PC (not supplied) running Windows
®
95 or
higher, with a Pentium
®
class processor and at least
64k of RAM.
The controller, variable frequency drive, burners,
pump and outside air blower must be electrically
grounded in accordance with the National Electrical
Code
®
ANSI/NFPA 70 - latest revision.
Before proceeding with the installation of the control-
ler, it will be necessary to check that the following
points have been considered.
1.4 Check Installation Materials
1.4.1 Switchable Loads
The controller relays are rated for switching loads no
greater than 3 A. The total added current load for all
8 relays must not exceed 25 A.
1.4.2 Control Wiring
Shielded cable (four twisted pairs of stranded 24
AWG minimum wire) is required for use with
indoor sensors.
Shielded cable (one twisted pair of stranded 22
AWG minimum wire) is required for the outdoor
air sensor, VFD signal wiring, pressure switch
and wiring from controller
#
1 to the PC.
Shielded cable (one twisted triad of stranded 22
AWG minimum wire) is required for RS-485
communications between controllers.
1.4.3 Control Board and Sensor Power
The power supply for all sensors is from the “+32 V”
terminal to be found on the board of the controller.
Power for the control board is 24 V provided by the
relay board.
1.4.4 Programming Details
Every controller is pre-programmed for one pump
and up to three heating zones. Use a site
layout drawing to identify the heating zones.