Johnson Controls HH-6705 Installation Guide

24-7701-136, Rev. B



FANs 216, 1628.3 Installation Instructions HH-6705 Issue Date 0316

TRUERH

HH-6705 Duct Humidistat

nstallation

IMPORTANT: Use this HH-6705 Series Duct

Humidistat only as an operating control. Where failure or malfunction of the HH-6705 Humidistat could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the HH-6705 Humidistat.

IMPORTANT: Utiliser ce HH-6705 Series Duct

Humidistat uniquement en tant que dispositif de régulation. Lorsqu'une défaillance ou un dysfonctionnement du HH-6705 Humidistat risque de provoquer des blessures ou d'endommager l'équipement contrôlé ou un autre équipement, la conception du système de contrôle doit intégrer des dispositifs de protection supplémentaires. Veiller dans ce cas à intégrer de façon permanente d'autres dispositifs, tels que des systèmes de supervision ou d'alarme, ou des dispositifs de sécurité ou de limitation, ayant une fonction d'avertissement ou de protection en cas de défaillance ou de dysfonctionnement du HH-6705 Humidistat.

Series

Tools Required

• hole saw with 1-3/4 in. (45 mm) diameter blade

• drill with 3/32 in. (mm) drill bit

• 1/4 in. (7 mm) and 1/8 in. (3 mm) flat-blade

screwdrivers

• gasket, sealer, or other material to seal the area between the unit and the duct

ocation Requirements

IMPORTANT: To avoid damage to the circuit board

and components, do not mount the unit in a location where high concentrations of corrosive vapors are present.

Place the humidistat in a location that complies with the following:

• Position: The humidistat is designed for duct mounting in any position, except with the probe tip pointed up.

• Duct Diameter: Recommended minimum diameter (round ducts) or width (square ducts) is 12 in. (305 mm).

• Air Stratification (when the unit is mounted on the discharge side of the fan): Recommended location is at least 8 ft (2.4 m) downstream from the humidification equipment, where duct air and water vapor are sufficiently mixed. Avoid areas where the probe may be exposed to condensation.

Parts Included

• HH-6705-9N0GP duct humidistat

• No. 6-32 x 1/4 in. binder-head cover screw

• 3 in. (76 mm) outside diameter steel washer

etpoint

Mounting Hole

Setpoint Potentiometer

Cover

Duct

Washer

The setpoint is adjustable from 30 to 90% Relative Humidity (RH). Use a 1/8 in. (3 mm) flat-blade screwdriver to adjust the setpoint potentiometer located under the cover. (See Figure 1.)

Figure 1: Adjusting the Setpoint

ounting

Mount the humidistat as follows:

1. Remove any excess insulation from the duct that prevents the probe from extending a minimum of 3 in. (76 mm) into the airstream.

2. Use the hole saw to make a 1-3/4 in. (44.5 mm) hole in the duct for inserting the probe.

Note: If the duct hole is larger, use the 3 in. (76 mm)

washer provided when installing the humidistat. (See Figure 2.)

3. Loosen the cover screw, and lift the cover off the unit. (See Figure 2.)

Figure 2: Mounting the Humidistat

4. Insert the probe into the duct, and mark the holes for the two mounting screws.

5. Remove the unit, and drill a 3/32 in. (2.4 mm) hole for each mounting screw.

6. Use a gasket, sealer, or other means to seal the area around the hole between the unit and duct.

IMPORTANT: Seal any holes created during

installation to help reduce drafts and for more accurate humidity readings. Use the washer provided, in addition to one of the materials in Step 6 if the duct hole is larger than 1-3/4 in. (44.5 mm).

7. Reinsert the probe, and secure the housing to the

2 TRUERH Series HH-6705 Duct Humidistat Installation Instructions

duct using two No. 6 sheet metal screws (not provided).

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