Johnson Controls HH-6705 Series Catalog Page

Code No. LIT-1900106

Issued September 12, 2007

HH-6705 Series

TRUERH™ Duct Humidistat

Description

The HH-6705 Series Duct Humidistat is typically mounted downstream from a humidifier, and turns the humidifier off (contact opens) when the setpoint is reached. Setpoint is adjustable from 30 to 90% Relative Humidity (RH). To reduce equipment cycling, the HH-6705 Series turns the humidifier on (contact closes) when the humidity in the duct falls 5% below the setpoint.

Repair Information

If the HH-6705 Series TRUERH™ Duct Humidistat fails to operate within its specifications, replace the unit. For a replacement humidistat, contact the nearest Johnson Controls® representative.

Features

•TRUERH™ circuitry and calibration techniques for which patent is pending

•All-Polymer™ humidity sensor with patented sensing element provides accurate and reliable humidity sensing with improved resistance to chemical corrosion

•30 to 90% RH adjustable setpoint covers most application requirements, including humidification and dehumidification

•5% fixed differential reduces humidification equipment cycling

•plastic duct probe improves thermal performance

•quick-mount, 2-screw installation reduces installation time and simplifies retrofits

TRUERHTM True ±2% Accur

HH-6705-9N0GP Duct Humidistat

Selection Chart

Code Number	Description
HH-6705-9N0GP	Duct Humidistat

Technical Specifications

HH-6705 Series TRUERH™ Duct Humidistat

2.19

55

Power Requirements

20 to 30 VDC at 33 mA

or 20 to 30 VAC, 50/60 Hz at 45 mA (1.35 VA maximum), Class 2

4.44

1.75

112

Output

Single-Pole, Single-Throw (SPST), normally open relay contact

45

Opens at setpoint on increasing RH

Closes at 5% RH below setpoint on decreasing RH

Relay

Maximum

4 ampere at 24 VAC;

Contact

pilot duty 42.4 VA at 24 VAC, Class 2

Rating

Minimum

100 mA at 5 VDC

Mounting Holes (2)

3/32 in. (2.4 mm)

Humidity

Element

All-Polymer

6 .

12

for No. 6 Screws

Setpoint

Adjustable from 30 to 90% RH

0.25

1.75

155

Sensing Range

0 to 100% RH, non-condensing

7

45

Differential

Fixed 5% RH

Ambient Operating Conditions

32 to 122°F (0 to 50°C)

0 to 100% RH, non-condensing;

1.62

86°F (30°C) maximum dew point

3.75

42

96

Survival Operating Conditions

-22 to 140°F (-30 to 60°C)

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0 to 100% RH, non-condensing;

86°F (30°C) maximum dew point

Ambient Storage Conditions

-40 to 176°F (-40 to 80°C)

0.50

0 to 100% RH, non-condensing;

13

86°F (30°C) maximum dew point

HH-6705 Dimensions, in. (mm)

Materials

Metal cover and housing with polymeric duct probe

Dimensions

Overall (H x W x D)

4.44 x 2.19 x 7.87 in. (113 x 56 x 200 mm)

Probe (D x L)

1.62 x 6.12 in.(41 x 155 mm)

Shipping Weight

1.5 lb (0.7 kg)

The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2012 Johnson Controls, Inc. www.johnsoncontrols.com

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