DriSteem Vapor-Logic Installation Guide download pdf (Page 8)

Double

Pane

Window

Glass

Secure temperature

sensor tip, to inside

surface of window glass

using clear RTV silicone

adhesive

Typical Sensor

Cord Routing

OM-337

Window Framing

OPTION: Variable Air Volume (VAV) (Shielded cable

recommended, see note.)

When the VAV control option is requested,

DRI-STEEM will provide, in addition to the room control

transmitter, a duct mounted humidity transmitter (4-20

mA output over 0-100% RH range).

The modulating high limit transmitter signal operates in

conjunction with the Room or Duct controlling

transmitter signal through the VAPOR-LOGIC

control

system to prevent over humidification in the duct work.

VAPOR-LOGIC will start lowering the humidifier output

when the duct relative humidity is within 6 percent of

the duct high limit set point.

When this occurs, the digital key pad will display the

message "VAV OUTPUT LIMIT". If necessary, the

reduction of the humidifier output will continue until

maximum high limit set point has been reached,

shutting off the humidifier completely.

When the high relative humidity starts to decrease in

the duct, VAPOR-LOGIC will slowly start to increase

the production of steam vapor. When the duct relative

humidity decreases to a point greater than 6 percent

below the duct high limit set point, the control

transmitter will be restored as the primary controller

and the key pad will remove the "VAV OUTPUT LIMIT"

text, returning the control system to normal operation.

PLACEMENT AND WIRING OF OPTIONAL SENSING DEVICES

The key pad will display the amount of offset that has

take

n place, "OFFSET RH=___%". As the interior

window glass temperature increases,

VAPOR-LOGIC will reduce the offset and restore

system control to the n

ormal RH set point for the

space.

The transmitter provided with VAPOR-LOGIC is cali-

brated for -29° C to 71° C with output from 4-20 mA. A

temperature reading of 21

C should produce a mea-

surement of 12 mA.

Note: DRI-STEEM recommends using 1.0 mm

plenum rated shielded cable for transmitter wiring

and grounding shield at a common point in the

control cabinet (see figure 8-1).

Cold Snap Transmitter Placement (See figure 8-2.)

1. Position the cold snap transmitter control

box on a wall adjacent to window frame.

2. Place flat surface of temperature sensor tip

on lower corner of glass surface.

3. Temporarily hold the sensor tip in place with

strips of masking tape.

4. Apply a small amount of clear RTV silicone

adhesive over and around the sensor tip

(making sure the sensor tip is in contact with

the window glass).

5. After adhesive has cured, remove masking

tape.

Figure 8-1: Shielded Cable

Shielded Cable

VAPOR-LOGIC

Sensor

Tip

Shield

Ground

Temperature

Transmitter

OM-

311

Ground shield at control panel end only. Do

not ground shield at device end.

OPTION: Cold Snap RH Offset (Shielded cable

recommended, see note). When selected as an option,

DRI-STEEM provides a cold snap temperature

transmitter.

The cold snap temperature transmitter continually

monitors the interior window glass temperature and

transmits this temperature to VAPOR-LOGIC.

VAPOR-LOGIC then compares the glass temperature

to the desired RH set point in the humidified area and

calculates the dew point (

°C) for the space. VAPOR-

LOGIC will lower (offset) the desired RH set point to a

safe condition, where condensation will not form on

windows.

Thermostat Control

Wires

Surface Mounted

Thermostat

Temperature

Control

Box on Wall

Figure 8-2: Cold Snap Transmitter Placement

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DriSteem Vapor-Logic Installation Guide Page 8

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