5
Main control board connections (cont.)
Important note about J17, J18 and J19:
All connection diagrams show connector shunts
on J17, J18 and J19. The connector shunts and
appropriate software have been selected by
RI-STEEM based on original customer orders.
Field changing the input connector shunts will
require control input modification See Page
23 Changing Control Input.
J17 Jumper pins determine the configuration of the
type of input control into the RH sensor input
(terminals 21 through 23) for wire terminal
connector J26.
R = Resistance, 0-150 Ohms range
Used with on-off humidistats, staging
switches, PE switches
Used with analog 0-150 Ohm input device
(pneumatic transducer or humidistat)
I = MilliAmp, 0-20 mA range
Used with any humidity sensor with
4-20 mA output
Used with any computer or energy
management system with 4-20 mA output
Internal resistance 249 Ohms, terminal 22
proportional signal, terminal 23 signal
ground
V = Volts C, 0-15 volt range
Used with any control humidistat 0-15V C
Terminal 21 provides positive 21 V C
supply, terminal 22 proportional signal,
terminal 23 signal ground
Product overview
Main control board connections (cont.).
Product overview:
Main control board connections
J18 Identical to J17 input selector pins except used to
configure duct high limit RH input (terminals 24
through 26) for wire connector terminal J27
J19 Identical to J17 input selector pins except used to
configure window temperature sensor input
(terminals 27 through 29) for wire connector
terminal J28
J20 Wire terminal connector supplies 24 VAC voltage
via terminals 1 and 2 to the fill valve and via
terminals 3 and 4 to the drain valve.
J21 Wire terminal connector supplies 24 VAC voltage
via terminals 5 and 6 to the power contactor and
via terminals 7 and 8 to the S U relay.
J22 Wire terminal connection allows for remote fault
indication. Relay closure is provided
(1 A max.).
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VL3-IOM-0301-METRIC.pdf 9 11/19/2009 9:22:37 AM
