7
Product overview
Expansion board connections.
Product overview:
Expansion board connections
GTS
®
and VAPORSTREAM
®
expansion board
connections
J1
Push-on connector for earth ground
J2
Blower No. 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 No. 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 No. 1. Terminal 10 receives a 24
VAC signal back from gas valve No. 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.
VL3-IOM-0301-METRIC.pdf 11
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Summary of Contents for Vapor-logic3
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