Roberts Gorden operation & service Service Manual download pdf (Page 9)

SECTION 1: INTRODUCTION

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It will then be possible to set program times and

temperatures for all controls from one location and

copy programs from one control to another.

It will also be possible to read the current status of

all controls from a single station.

1.6 Installation Requirements

1.6.1 Radiant Tube Heaters

The ROBERTS GORDON

NRG Control can

operate up to ten burners providing that the

electrical load on each relay does not exceed 7 A

inductive.

Mount ROBERTS GORDON

NRG Control (or

remote sensor if fitted) on a wall or column at a

height of approximately 1.5 to 1.8 metres from the

floor.

The ROBERTS GORDON

NRG Control, or sensor,

should be in a position to monitor an average radiant

temperature. Keep clear of cold draughts, direct

sunlight, direct radiant field heaters and areas of

little air movement such as corners. For larger

systems, use two remote sensors to provide closer

temperature control.

1.6.2 Warm Air Heaters

The ROBERTS GORDON

NRG Control can

operate a single warm air heater. However up to four

heaters may be controlled from each control if each

heater is provided with interface relays See Page 13,

Section 4.7.

Mount ROBERTS GORDON

NRG Control, or

remote sensor, on a wall or column at a height of

approximately 1.5 to 1.8 metres from floor. The

ROBERTS GORDON

NRG Control, or sensor,

should be positioned where it will monitor an

average room temperature. Keep clear of cold

draughts, direct sunlight, path of warm air from

heater and areas of little air movement such as

corners.

1.6.3 Multiple Unit Considerations

When using control to operate more than one

radiant or warm air heater, careful consideration

should be given to position of control or remote

temperature sensor because single temperature

monitoring point controls all heaters that are

connected. The use of two remote sensors may

provide closer temperature control.

For warm air heaters, the interface relay D 258 must

be installed, in accordance with Page 13, Section

4.7, adjacent to each heater to ensure that the

electrical supply at each heater is isolated for

maintenance.

For larger air heaters, it may not be practical to

operate more than one heater from a single control

due to the larger area covered by these heaters.

Contact Roberts-Gordon Europe Limited for further

advice on control location and application.

1.6.4 Installation Materials

Shielded cable Belden 8451, General Cable C 2514,

or equivalent rated for up to 300 V must be used for

sensors, modulating 0-10 V output, 12 V DC inputs

and network bus connections. Maximum cable

length for each sensor is 100 m. Maximum cable

length for network is 1,000 m. Keep control cables

away from high current mains circuits to prevent

signal interference.

1.6.5 Electrical Requirements

The controller must have a 230 V 50 Hz

power supply wired with the Ferrite EMC filter. See

Page 7, Figure 7 in accordance with relevant wiring

diagram from Page 9, Section 4.

1.7 P ro gramming Details

Every control is programmed with default settings

and may be reconfigured to suit the needs of the

installation. See Page 33, Section 5.6.3 and Page

34, Table 1.

When supplied, each ROBERTS GORDON

NRG

Control is configured as a stand alone unit.

Each unit must be configured to operate heating

equipment it is controlling. See Page 33, Section

5.6.3 and Page 34, Table 1.

Programming for stand alone units and network

units is similar. However, for network units, they

must be network configured first. See Page 31,

Section 5.6.1.

DANGER

Electrical Shock Hazard

Disconnect electric before service.

Controller must be properly grounded to an

electrical source.

Failure to follow these instructions can

result in death or electrical shock.

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