Engineered air DG series Manual de usuario descargar pdf (Pagina 8)

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T991A HONEYWELL OR OTHER SERIES 90 CONTROL

The series 90 controls are a 135-ohm control system that usually uses a liquid filled

capillary to move a wiper over the surface of the resistor to change the values between

two points. The T991 centre tap (R) connects to the 109 terminal 2. The T991 terminal

“W” connects to the “W” terminal on the 109 interface. The T991 terminal “B” connects to

the 109 interface terminal 4.

W973 and W7100 HONEYWELL CONTROLS

Output from the W973 heating terminals “R” and “W” can be connected to the 109

interface terminals “6” and “2” respectively. The 109 is also available to interface the

W7100 but requires a jumper across interface terminals 6 and 7 to speed up the interface

by making it more sensitive to the slow reacting heat ramp from the W7100.

CTRAC CONTROL

The Engineered Air CTRAC control is designed to operate with a heat output ramp from

CTRAC terminals “HT” and “B”. This is a 0 to 8 VDC signal with terminal 8 being the

positive terminal.

4 TO 20 ma INPUT FROM CONTROL DEVICE OR BMS SYSTEM

A separate underground transformer should be used on the 109-2 interface terminals “T

and T” to avoid any possible feedback signal from the 4-20ma device through a ground

signal. The input terminals on the 109-2 are 2 and 7 with 7 being the positive terminal.

When the input signal to the 109 is at the full 20ma, the voltage reading across 109

terminals “2” and “W” should read 2 volts + or – 0.25 volts.

0 TO 10 VDC INPUT FROM CONTROL DEVICE OR BMS SYSTEM

A separate underground transformer should be used on the 109-2 interface terminals “T

and T” to avoid any possible feedback signal from the 0-10 VDC device through a ground

signal. The input terminals on the 109-2 are terminals 1 and 7 with terminal 7 being the

positive terminal. When there is a 10 volt signal input to 109 terminals “1” and “7”, there

should be a reading across 109 terminals “2” and “W” of 2 volts + or – 0.25 volts.

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Engineered air DG series Manual de usuario Pagina 8