CRV-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL

SECTION 12: CONTROL METHODS

WARNING

Electrical Shock Hazard

Disconnect electrical power and gas supply before servicing.

This appliance must be connected

to a properly grounded electrical source.

Failure to follow these instructions can result in death or electrical shock.

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

12.1 ROBERTS GORDON® System Control

The System Control is an electronic control panel designed to control CRV-Series heating systems. The System Control wiring is shown on Page 46, Figure 29 through Page 47, Figure 32 and in the System Control Installation Manual

(P/N 10091601NA). 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 phase models may be controlled by a relay or motor starter. The System Control can control up to four zones of burners.

The electrical circuit is a 120V AC (20A) supply. The output for the thermostat is 12V DC. Do not use thermostats that draw power from the low voltage supply.

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 the zones as well as indicating the status of the pressure switch with lights.

The System Control is UL listed in accordance with UL873 – Temperature Indicating and Regulating Equipment.

12.2 ROBERTS GORDON® ULTRAVACTM

The ROBERTS GORDON® ULTRAVACTM 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® ULTRAVACTM Software.

ROBERTS GORDON® ULTRAVACTM 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® ULTRAVACTM Controller.

12.3 SPST Transformer Relay (P/N 90417600)

The transformer relay wiring diagram is shown on Page 43, Figure 26. The transformer relay can be used to control an EP-100 or EP-201 pump CORAYVAC® system. The single pole relay can only be used to control one zone of burners.

The electrical circuit is a 120V AC (20 A) supply. The transformer 24V AC output for the thermostat is rated at 40 V A. Thermostats used with the transformer must not exceed this power requirement. A transformer relay operated system will not give any post purge pump operation to completely exhaust products of combustion from the system or provide indication of operating conditions.

12.4 DPST Transformer Relay (P/N 90436300)

The transformer relay wiring diagram is shown on Page 45, Figure 28. The transformer relay can be used to control an EP-100 or EP-201 pump CORAYVAC® system. The double pole relay can only be used to control two zones of burners.

The electrical circuit is a 120V AC (20A) supply. The transformer 24V AC output for the thermostat is rated at 40VA. Thermostats used with the transformer must not exceed this power requirement. A transformer relay operated system will not give any post purge pump operation to completely exhaust products of combustion from the system or provide indication of operating conditions.

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Roberts Gorden CRV-B-8, CRV-B-9, CRV-B-12A Control Methods, Roberts Gordon System Control, Roberts Gordon Ultravactm
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CRV-B-4, CRV-B-12, CRV-B-2, CRV-B-10, CRV-B-6 specifications

The Roberts Gordon CRV-B-9 is a state-of-the-art infrared radiant heater designed for industrial and commercial heating applications. Renowned for its efficiency and effectiveness, the CRV-B-9 represents a significant advancement in the world of space heating solutions.

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