LENNOX 21W06 Temperature and Humidity Sensor Kit Installation Guide

WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause personal injury, loss of life, or damage to property. Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.

CAUTION: Electrostatic Discharge (ESD) can affect electronic components. Take necessary precautions during unit installation and service to protect the unit’s electronic controls. Neutralize electrostatic charge by touching hand and tools on an unpainted unit surface before any service procedure.

Shipping and Packing List:

Sensor (A37)
Screws

Cable Applications

Wire runs of 150′ (46m) or less: Use three separate shielded cables containing 18AWG minimum, twisted pair conductors with overall shield. Connect cable shield drain wires as shown in Figure 1.

Wire runs over 150 feet (46m): Use a local, isolated 24VAC transformer to supply power to sensor. Use three shielded cables containing 20AWG minimum, twisted pair conductors with overall shield.

Wall-Mount Installation

Install sensor on a standard handy box or directly on the wall approximately 5 feet above the floor in an area with good air circulation at average temperature.
Route shielded cables from the rooftop unit to the appropriate location in the conditioned space.

Loosen screws and remove sensor cover.
Insert wall anchors and align baseplate over the opening in the wall.

Pull wiring through the opening in the baseplate.
Secure baseplate to the wall with screws.

Connect wiring for the appropriate length of run as shown in Figure 1 or 2.
Replace humidity sensor cover and secure it in place by turning set screws counterclockwise.

DIP Switch Settings

DIP switches are factory set. Check the sensor output annually for accuracy. Keep the air intake openings on the sensor clean and free of obstructions and debris.

FAQ

Q: How often should I check the sensor output for accuracy?

A: It is recommended to check the sensor output annually to ensure accuracy.

Q: What precautions should I take regarding Electrostatic Discharge (ESD)?

A: To protect electronic components, neutralize electrostatic charge by touching hand and tools on an unpainted unit surface before performing any service procedure.

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©2023 Lennox Industries Inc. Dallas, Texas, USA CONTROLS KITS AND ACCESSORIES 505196M 11/2023 Supersedes 03/2023 COMBINATION TEMPERATURE / HUMIDITY (RH) SENSOR KIT INSTALLATION INSTRUCTIONS FOR COMBINATION TEMPERATURE / HUMIDITY (RH) SENSOR KIT (21W06 AND 101046) USED WITH LG/LC/SG/SC UNITS WARNING Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property. Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency. CAUTION ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the unit’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting theunit, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface before performing any service procedure. Shipping and Packing List Wire runs of 150′ (46m) or less: Use three separate shielded cables containing 18AWG minimum, twisted pair conductors with overall shield (Belden type 8762 or 88760 [plenum] or equivalent). Connect cable shield drain wires as shown in Figure 1. 1 – Sensor (A37) 2 – Screws Cable Applications Wire runs of 50′ (15m) or less: Use three separate shielded cables containing 20AWG minimum, twisted pair conductors with overall shield (Belden type 8762 or 88760 [plenum] or equivalent). Connect cable shield drain wires as shown in Figure 1. Figure 1. Field Wiring [150 ft. (46m) or Shorter Runs] Wire runs over 150 feet (46m): Use a local, isolated 24VAC transformer such as Lennox cat #18M13 (20VA minimum) to supply power to sensor as shown in figure 2. Use three shielded cables containing 20AWG minimum, twisted pair conductors with overall shield [Belden type 8762 or 88760 (plenum) or equivalent]. Figure 3. Temperature/Humidity Sensor (A37) 3. Center opening in baseplate over opening in wall. 4. Mark holes for screws (see Figure 4). 5. Remove baseplate and drill holes. Figure 2. Field Wiring [150 ft. (46m) or Longer Runs] Wall-Mount Installation Install sensor on a standard handy box or directly on wall. Locate sensor in conditioned space approximately 5 feet (11/2m) above the floor in an area with good air circulation at average temperature. Avoid locating the sensor where it might be affected by: · Drafts or dead spots behind doors and in corners · Hot or cold air from ducts · Radiant heat from sun or appliances · Excessive moisture · Corrosive fumes · Excessive vibration · Extremely high temperatures 1. Route shielded cables from the rooftop unit to the appropriate location in the conditioned space. 2. Loosen screws and remove sensor cover (see Figure 3). Figure 4. Wall-Mount Sensor Baseplate 6. Insert wall anchors (field provided) and align baseplateover opening in wall. 7. Pull wiring through opening in baseplate. 8. Secure baseplate to wall with screws. 9. Connect wiring for appropriate length of run as shown in Figure 1or 2. 10. Replace humidity sensor cover and turn set screws counterclockwise to secure cover in place. 2 DIP Switch Settings DIP switches are set at the factory. Proper settings are shown in Figure 5. Check the sensor output annually for accuracy. Keep the air intake openings on the sensor clean and free of obstructions and debris. Display zone sensor reading on the controller M1 IMC: 1. Turn the “TMP” DIP switch ON. 2. Press the pushbutton 4 times. The IMC readout will alternate between A2 (output being read) and the temperature. 3. Press the pushbutton 5 more times. The IMC readout will alternate between rH (output being read) and the zone sensor humidity reading. M2: 1. Use the scroll buttons to locate DATA->SENSORS -> ZAT. The Zone Air Temperature (ZAT) displays (e.g. ZAT:79F). 2. Refer to the controller manual for more details. M3: Figure 5. Wall-Mount DIP Switch Settings Check-Out NOTE: The temperature thermistor should read a resistance of 11K Ohm at 77F (+/- 1.5%). The current ZAT reading when enabled is always displayed on the status screen. It can also be displayed using the following procedure: 1. Use the scroll buttons to locate DATA > IN/ OUTPUTS > SENSORS > LOCAL. From the LOCAL SENSOR screen, scroll down to the ZAT information. The Zone Air Temperature (ZAT) displays(e.g. ZAT: 79F). Verify the humidity reading is proper by using the L 2. Refer to the controller manual for more details. Connection ® PC Software, the NCP (A105), the controller (A55), or by measuring the sensor output voltage Relative M4: humidity should correspond to the sensor (A37) output The current ZAT reading (when enabled) displays on the voltage listed in table 1. For example: if indoor air relative system overview screen of the Lennox® CORE Service App. humidity is 80% + 3%, the humidity sensor output should The ZAT reading can also be found in the Data Menu (after read 8.00VDC. connecting to the RTU with the app): Table 1. RH to Sensor Output Voltage 1. Navigate to the RTU Menu. 2. Select SYSTEM DATA / SENSOR DATA/ OUTPUTS. Relative Humidity (%RH ± 3%) 20 30 40 Sensor Output (VDC) 2.00 3.00 4.00 3. Select LOCAL INPUTS, SENSORS. The Zone Air Temperature will be listed (e.g. ZAT: 79F). 4. Refer to the controller manual for more details. 50 5.00 60 6.00 70 7.00 80 8.00 90 9.00 3 4

Documents / Resources

LENNOX 21W06 Temperature and Humidity Sensor Kit [pdf] Installation Guide
21W06, 101046, 21W06 Temperature and Humidity Sensor Kit, 21W06, Temperature and Humidity Sensor Kit, Humidity Sensor Kit, Sensor Kit, Kit

References

User Manual

21W06 Temperature and Humidity Sensor Kit

Specifications

Product Usage Instructions

Installation Instructions