DriSteem Vapor-logic3 Operations Instructions download pdf (Page 9)

7

Product overview

Expansion board connections.

Product overview:

Expansion board connections

GTS

®

and VAPORSTREAM

®

expansion board

connections

J1 1/4" push-on connector for earth ground

J2 Blower # 2 control:

• Terminal 21: Positive polarity 21 VDC supply

(25 mA max)

• Terminal 22: Blower tachometer feedback

• Terminal 23: PWM output to blower

• Terminal 24: Common

J3 Blower # 1 control:

• Terminal 17: Positive polarity 21 VDC supply

(25 mA max)

• Terminal 18: Blower tachometer feedback

• Terminal 19: PWM output to blower

• Terminal 20: Common

J5 Ribbon cable connector for VAPOR-LOGIC

®

3

main controller connection

J6 Ribbon cable connector for additional

VAPOR-LOGIC

3

expansion modules

J7 Wire terminal supplies 24 VAC to power the

VAPOR-LOGIC

3

expansion module.

• Terminal T1 – 24 VAC, 10 VA maximum

load

• Terminal T2 – 24 VAC common

J8 Wire terminal connector supplies 24 VAC voltage

with terminal pairs 1 and 2, 3 and 4, and 5 and 6

to either contactors or GTS ignition controllers.

(Terminals 1, 3 and 5 supply the 24 VAC.

Terminals 2, 4 and 6 provide the 24 VAC

common.)

J9 Wire terminal connection provides optically

isolated connections for the gas valve feedback.

Terminals 7 and 9 provide 24 VAC and are not

used. Terminal 8 receives a 24 VAC signal back

from gas valve #1. Terminal 10 receives a 24

VAC signal back from gas valve #2.

J10 Wire terminal connection provides optically

isolated connections for the combustion air

damper limit switch, power vent pressure switch

and flue differential pressure switch. Terminal 11

supplies 24 VAC to the combustion air damper

limit switch, which closes when the damper has

opened. Terminal 12 is the return connection

from the limit switch into the VAPOR-LOGIC

3

expansion module. Terminal 13 supplies 24 VAC

to the power vent pressure switch which closes

when the fan has started. Terminal 14 is the

return connection from the pressure switch into

the VAPOR-LOGIC

3

expansion module. Terminal

15 supplies 24 VAC to the flue differential

pressure switch which closes when the blowers

have started. Terminal 16 is the return

connection from the differential pressure switch

into the VAPOR-LOGIC

3

expansion module.

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