
Page 14 • DRI-STEEM Vapor-logic3 to Vapor-logic4 Adaptor Board Installation Manual
Electric humidifiers:
Safety circuit wiring
Figure 14-1:
Leaving safety circuit wired in series with one alarm
• CRUV without door interlock,
• Vapormist
• Humidi-tech
The following procedure leaves the safety circuit (door interlock and
low water) wired in series with one alarm:
1. Verify that jumpers shown in Figure 14-1 are in place.
2. Land wire 802 at terminal P3-3 on Vapor-logic4 adaptor board (see
Figure 14-1).
3. Humidi-tech only: Clamp ferrite core around drain valve wiring.
Proceed to “Start-up and validation” on Page 19.
Gray-handled jumper provided with
upgrade kit
DM-11260
DM-11261
Gray-handled jumper provided with
upgrade kit
VL3 main board
VL4 adaptor board
VL4 adaptor board
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