Engineered air DG series Información técnica descargar pdf (Pagina 22)

A G-TRAC2 MANUAL

General Manual Revised: 03/15/99

Page

Multiple Room Sensors

Four sensors can be wired to give an average reading of room temperatures to the TRAC control. They must be

wired in a series/parallel arrangement. The drawing above drawing shows a circuit making use of the built in

sensor in the TE6100 Johnson Sensor/Setpoint assembly and using TE6000 sensors for the other three. (The

other three could also be TE6100, just using the sensor wires .)

BMS Reset (Continuous blower only)

Dipswitch A-1 must be on to activate this option. This option requires an analogue voltage or current signal to be

wired to the optically isolated + and

terminals. The analogue input signal proportionally increases the calculated

discharge air set-point. (The “calculated discharge set-point” equals the master discharge set point plus the input signal

multiplied by a reset ratio factor.)

NOTE: The direction of reset is up only. The maximum amount of reset is adjustable from 15ºF to 60ºF. The

maximum discharge temperature (dial set point plus reset) is limited to 120ºF.

The BMS reset option is activated by dipswitch A-1. Reset ratio pot is labelled “BMS Reset Pot”.

NOTE: As a standard, the G-TRAC2 is designed to operate with 4-20 ma or 2-10 VDC into a 500 OHM load.

Some BMS devices do not have enough drive (VA) to provide a full 10 VDC when connected to a 500-ohm load.

The input resistance for this operation can be increased to 1500-ohms by cutting resistor R48. (To cut this resistor

you must turn the board over. It is located on the back of the board, near the bottom, and close to the terminal ‘+’. This is a 1

watt 680 ohm resistor; colours blue, grey, brown, gold.)

The BMS reset curve is not truly linear. Reset will usually be measurable at about 3 to 4 volts. The following

sample table is based on a minimum set point of 55°F with the maximum reset limit is set to 13ºC (or 24°F).

TE6000

Grey

Orange

Blue

Built in TE6100

Sensor Element

TE6000

Violet

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 41 42

Sin comentarios

Engineered air DG series Información técnica Pagina 22