DRI-STEEM Vapor-logic3 to Vapor-logic4 Adaptor Board Installation Manual • Page 5
Figure 5-1:
Splitting interlocked terminal blocks
10. Make sure subpanel surface is clean and dry. Remove adhesive
backing paper from new stand-offs, and press adaptor board into
exact location where Vapor-logic3 board was mounted.
11. Land loose Vapor-logic3 terminal blocks on corresponding pin
locations of Vapor-logic4 adaptor board.
Notes: Some 4-pin terminal blocks are two interlocked 2-pin
blocks that will need to be split. See Figure 5-1.
Scrape away any pin hole or screw corrosion before landing
terminal blocks on Vapor-logic4 adapter board.
Not all Vapor-logic3 wire connections will be used for this
upgrade. Cap bare ends of unused wires with wire nuts,
and tuck them into wire channel.
12. Cut an 18-gauge, stranded wire long enough to reach terminals T2
and 33 on Vapor-logic4 adaptor board (Figure 5-2). Strip ends of
wire, land ends at terminals T2 and 33, and torque terminal screws
to 2.5 in-lb (0.28 N·m).
13. Configure either modulating or on-off duct high limit:
• Modulating: Move Vapor-logic3 terminal block 24/25/26 to Pins
24/25/26 on Vapor-logic4 adapter board.
• On-off: Move wire from Vapor-logic3 Pin 26 to Pin 24 of same
terminal block. Then move terminal block to Pins 24/25/26 on
Vapor-logic4 adapter board.
Transferring expansion board terminal blocks
Leave the wires in the terminals when transferring the terminal blocks
from the Vapor-logic3 expansion board(s) to the Vapor-logic4 adaptor
board.
Note: To facilitate wire re-routing and provide slack, remove top wire
channel cover. Unbundle wires as necessary in channel and in
wiring harness leading to burners.
GTS humidifiers have one or two Vapor-logic3 expansion boards.
If upgrading from Vapor-logic3 with two expansion boards, land
terminal blocks from one expansion board at a time.
Vapor-logic4 adaptor board pin locations for Vapor-logic3 expansion
board terminal blocks are labeled and
, as shown in Figure 4-1.
Figure 5-2:
Jumpering terminals T2 and 33
Jumper
T2
33
Top edge of VL4
adaptor board
GTS humidifiers:
Board removal and replacement
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