Engineered air DG series Instrukcja Użytkownika Pobierz pdf (Strona 7)

Page 3

CONTROL CONNECTIONS

24 VOLT SUPPLY – to 109 terminals T and T

INTERNAL RELAY TERMINALS – used to cycle the signal to the flame relay (or the gas valve)

are terminals 8 and 9 on the 109.

TEMPERATURE CONTROL INPUT TERMINALS:

Note – the 109 system is designed to operate with only one of the following discharge air control

signals connected at a time.

MAXITROL SERIES 14 SYSTEM

The Maxitrol system outputs a DC voltage signal from its terminals 5 and 6. This signal is

put into the 109 at the 109 terminals 5 and 6 respectively. This signal will vary as per the

following: 0-3 VDC low fire

3-13 VDC modulating fire

above 13 VDC is high fire

Note - the 109 requires a jumper across the 109 terminals 1 and 2 to operate with the

Maxitrol system. The 109-2 does not require this jumper as it is done internally.

The following readings were taken from a maxitrol system connected to a 109-2

High fire output from the Maxitrol system = about 34 VDC

High fire output not connected to the 109 = about 36.15 VDC

Full heat call, mod valve disconnected R – W = 1.9 VDC

R – B = 0 VDC

B – W = 1.9 VDC

Low fire, all the above go to 0 VDC

Full heat call, V9055 connected R – W = 1.9 VDC

R – B = 0 VDC

B – W =2.9 VDC

Low fire with V9055 connected R – W = 0.37 VDC

R – B = 1.1 VDC

B – W = 1.4 VDC

MAXITROL SERIES 44 SYSTEM

This is similar to the series 14 system above, but the series 44 output terminals “6” and

“7” connect to the 109 terminals “5” and “6” respectively. The Maxitrol system offers a

linear space reset feature. Most of the above series 14 readings will apply.

1 2 3 4 5 6 7 8 9 10

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Engineered air DG series Instrukcja Użytkownika Strona 7