Roberts Gorden CRV-B-8 Control Methods, Electrical Shock Hazard, Explosion Hazard, Danger

CRV-SERIES DESIGN MANUAL

SECTION 8: CONTROL METHODS

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.

There are several methods of controlling CRV-Series systems. The options are as follows:

8.1ROBERTS 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.

26