Roberts Gorden CRV-B-4 - Manual (Page 32)

CRV-S ERIES D ESIGN M ANUAL
26
SECTION 8: CONTROL METHODS
There are several methods of controlling CRV-Series
systems. The options are as follows:
8.1 ROBERTS GORDON ® System Control (P/N
02770002)
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 the
System Control Installation, Operation and Service
manual (P/N 10091601NA).
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 low voltage
thermostats approved for use with the system
control.
A System Control operated system has two minutes
post purge pump operation to completely exhaust
products of combustion from the system. A system
control provides indication of power to the pump and
zones and indicates the status of the pressure switch
with lights.
The System Control is ETL listed in accordance with
UL873 – Standard for Temperature Indicating and
Regulating Equipment.
8.2 ROBERTS GORDON ® ULTRAVAC ™
The ROBERTS GORDON ® ULTRAVAC ™ is a micro
processor based control package designed for modu-
lating control of CRV-Series heaters based on outdoor
temperatures. The controls offer full modulation
between 60% and 100% of system maximum rated
input.
This controller is capable of giving control outputs to
one pump and three heating zones. The controller
also features inputs which are used for indoor and out-
door signal condition monitoring.
System status and settings are viewed and altered
from a PC (not supplied) running ROBERTS GOR-
DON
® ULTRAVAC ™ Software.
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.
Special design requirements apply for CRV-Series
systems using the ROBERTS GORDON
® ULTRA-
VAC ™ Controller, See Page 31, Section 10.
DANGER
Electrical Shock Hazard
Disconnect electric before service or
maintenance.
More than one disconnect switch may be
required to disconnect electric to the unit.
Control must be properly grounded to an
electrical source.
Failure to follow these instructions can
result in death or electrical shock.
WARNING
Explosion Hazard
Turn off gas supply to heater before service.
Failure to follow these instructions can result
in death, injury or property damage.