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VAPOR-LOGIC VERSION 3 TO VAPOR-LOGIC VERSION 6 FIELD CONVERSION INSTRUCTIONS: CRUV HUMIDIFIERS 

 WARNING

Fire and electrical shock hazards

This page provides important 
safety instructions; it is intended to 
supplement — not replace — the 
humidifier's Installation, Operation, 
and Maintenance Manual (IOM). Read 
the IOM that was provided with the 
humidifier before performing service 
or maintenance procedures on any 
part of the system. Failure to follow 
all warnings and instructions could 
produce the hazardous situations 
described here and in the IOM, 
resulting in property damage, personal 
injury, or death.
If the IOM is missing, go to 
www.dristeem.com to download a 
replacement.
Improper installation, adjustment, 
alteration, service, maintenance, or 
use can cause fire, electrical shock, 
and other hazardous conditions. These 
hazardous conditions could cause 
personal injury, property damage, or 
death. 
To prevent hazardous conditions, read 
all warnings; lock all power disconnect 
switches in the OFF position before 
removing any access panels; and 
consult a qualified installer, service 
agency, or your distributor or branch 
for information or assistance. The 
qualified installer or agency must use 
only factory authorized and listed kits 
or accessories when modifying this 
product.

DriSteem humidifiers are warranted according 

to the terms and conditions of the standard 

two-year Limited Warranty effective when the 

humidifier was purchased. See the literature 

that was shipped with the humidifier for 

warranty information.

mc_081308_1405

Note:

  If literature shipped with the humidifier 

is not available, historical literature is 

available at www.dristeem.com.

Vapor-logic

®

 version 3 to Vapor-logic version 6 Field 

Conversion Instructions: CRUV

®

 Humidifiers 

The drawing at right depicts the 
Vapor-logic version 3 board orientation 
in a CRUV humidifier control cabinet 
without SSRs. The board would be 
oriented horizontally in a control cabinet 
with the SSR option.

These instructions pertain only to CRUV 
humidifier units with Vapor-logic control. 
This does not apply to CRUV units with 
the standard onboard controller.

1.  Leave the wires connected to 

the Vapor-logic version 3 board 
terminals. Use needlenose pliers to pull the terminals off of the pins.

2.  Remove the six screws holding the Vapor-logic version 3 board to the 

subpanel, and remove the board. When removing the screws, take care 
to prevent the standoffs behind the board from falling down the subpanel 
and into other electrical components.

Note:

  The Vapor-logic version 6 board has adhesive-backed standoffs that 

adhere to the subpanel. For the best adhesion, make sure the subpanel 
surface is clean and dry.  

3.  Note the Vapor-logic version 6 board orientation shown in Figure 3-1. 

Remove the adhesive backing paper from the Vapor-logic version 6 board 
standoffs, and press the Vapor-logic version 6 board onto the subpanel 
as close as possible to the original footprint of the Vapor-logic version 3 
board. 

4.  See Figure 3-1. The Vapor-logic version 3 disconnections and 

Vapor-logic version 6 connections needed for this conversion are labeled. 

Note:

  If any wires are too short to reach their new locations on the 

Vapor-logic version 6 board, add pigtail extensions to them. 

5.  Skip this step if the humidifier does not have the SSR option: 

Disconnect wire #434 from Vapor-logic version 3 terminal 

34

, and 

connect it to Vapor-logic version 6 P19 plug terminal 

+SSR

. Disconnect 

wire #435 from Vapor-logic version 3 terminal 

35

, and connect it to 

Vapor-logic version 6 P19 plug terminal 

–BL

.

6.  Disconnect the wires from Vapor-logic version 3 terminals 1, 3, and 

5, and connect them to the following Vapor-logic version 6 P17 plug 
terminals: Connect wire #401 to 

FILL

, wire #403 to 

DRAIN

, and wire 

#405 

CT1

.

Vapor-logic version 3 board in a control cabinet

Summary of Contents for VAPOR-LOGIC 3

Page 1: ...ersion 3 board orientation in a CRUV humidifier control cabinet without SSRs The board would be oriented horizontally in a control cabinet with the SSR option These instructions pertain only to CRUV humidifier units with Vapor logic control This does not apply to CRUV units with the standard onboard controller 1 Leave the wires connected to the Vapor logic version 3 board terminals Use needlenose ...

Page 2: ...ail terminal T3 11 Disconnect wires 801 and 000 from Vapor logic version 3 terminals T1 and T2 If the terminals are not marked see the photo at right Connect the wires to the following Vapor logic version 6 P1 plug terminals Connect wire 801 to 24VAC and wire 000 to 12 Humidifier with tap softened water Disconnect the wires from Vapor logic version 3 terminals 30 31 32 33 and connect them to the f...

Page 3: ...switch connections for DI water option See step 12 on Page 2 Connections for SSR option See step 5 on Page 1 Vapor logic 3 board disconnections Commons to wire nut See note at right Display connection 408 407 406 404 402 408 000 from SDU fan wire on subpanel 35 34 19 20 Typical Vapor logic boards shown P4 P3 P2 P16 P17 P18 lsw TT LOW MID TOP 24VAC Vapor logic 6 board connections 420 419 433 430 43...

Page 4: ...ademarks of Research Products Corporation and are filed for trademark registration in Canada and the European community Product and corporate names used in this document may be trademarks or registered trademarks They are used for explanation only without intent to infringe 2016 Research Products Corporation Expect quality from the industry leader Since 1965 DriSteem has led the industry with inno...

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