Roberts Gorden CRV-B-9 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:

8.1 ROBERTS GORDON® System Control

The System Control is an electronic control panel designed to control CRV-Series heating systems.

The System Control can be used to control an EP- 100 or EP-201 pump from the control panel. Other pumps such as the EP-301 and 3 Ø models may be controlled in conjunction with a relay or motor starter. The System Control can control up to four zones of burners and up to two vacuum pumps.

The electrical circuit is a 120 Vac (20 A) supply. The output for the thermostat is 24 Vac.

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 modulating 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 outdoor signal condition monitoring.

System status and settings are viewed and altered from a PC (not supplied) running ROBERTS GORDON® 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. For complete installation details, please refer to the ROBERTS GORDON® ULTRAVAC™ Installation, Operation and Service Manual (P/N 10081601NA), latest revision.

Special design requirements apply for CRV- Series systems using the ROBERTS GORDON® ULTRAVAC™ Controller.

Buildings today demand all sorts of control options based on the user’s preference. ULTRAVAC™ controls offer a host of communication options for integration with controls’ networks to best serve individual needs:

ULTRAVAC™ BMS Link: Interface ULTRAVAC™ with other building management control platforms using BACnet® or MODBUS® protocol which communicates via our ULTRAVAC™ BMS Link option.

TCP/IP (LAN): Connect to ULTRAVAC™ via your local area network of computers. Load ULTRAVAC™ software onto any computer on the network and control and view your heating system from your computer via static IP address.

MODEM: Dial into ULTRAVAC™ from anywhere in the world via modem. Supplied as standard on all central controllers!

RS-485:Hard wire ULTRAVAC™ directly to your computer.

8.3 CORAYVAC® Modulating Controls

For a ROBERTS GORDON® CORAYVAC® Modulating system, combine a modulating thermostat, a thermostat relay (P/N 90417600K) and any one of the existing ROBERTS GORDON® VFD assemblies. The result will be a one pump, one zone

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