Lennox 47W36 - User Manual

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E2018 Lennox Industries Inc.
Dallas, Texas, USA
COMMERCIAL UNITS
KITS AND ACCESSORIES
504,603M
1/2018
Supersedes 11/2016
INDOOR REMOTE SENSORS
INSTALLATION INSTRUCTIONS FOR INDOOR REMOTE TEMPERATURE SENSORS
— 10K OHM (47W37) AND 20K OHM (47W36)
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal inju
ry or loss of life.
Installation and service must be performed by a licensed
professional HVAC installer (or equivalent) or service
agency.
When the remote indoor sensor is installed with a
commercial touch screen thermostat, use these
instructions to install the sensor. Also see the touch screen
instructions for more on wiring the sensor to the
thermostat.
PRE-INSTALLATION
Cover Removal
A snap-fit locking mechanism is used to attach the cover of
the remote indoor sensor to its sub-base. To remove the
cover from the sub-base:
1. Insert a thin, flat blade screwdriver into each of the two
slots at the bottom of the module to release the two
locking tabs (see figure 1).
LOCKING TAB
SLOTS (2)
Figure 1. Cover Removal
2. Tilt the cover out and away from the sub-base to
release the two locking tabs.
Electrical Wiring Practices
CAUTION
Erratic System Operation Hazard.
Failure to follow proper wiring practices can introduce
disruptive electrical interference (noise).
IMPORTANT
All wiring must comply with local electrical codes and
ordinances, or as specified on installation wiring
diagrams.
Typical Commercial Touch Screen Thermostats
The following items are recommended for indoor remote
sensor installations:
1. Keep wiring at least one foot away from large inductive
loads such as motors, line starters, lighting ballasts,
and large power distribution panels.
2. Shielded cable is required in installations where these
guidelines cannot be met.
3. Ground shield only to grounded controller case.
4. When connecting to all other thermostats, remote
indoor sensor wiring can be sized from 16 to 22 AWG
(1.31 to .34 mm
2
) depending on the application.
5. The maximum length of wire from a thermostat or
remote indoor sensor to another remote indoor sensor
is 1000 feet (305 meters).
6. Twisted pair wire is recommended for wire runs longer
than 100 feet (30.5 meters).
ComfortSense 7500 Commercial Thermostat (13H15)
and ComfortSense 8500 (14X55 and 14X56)
1. Must keep wiring at least one foot away from large
inductive loads such as motors, line starters, lighting
ballasts, and large power distribution panels.
2. Do not use shielded cabling.
3. Use only standard two-wire thermostat wire.
4. Indoor (room) sensor wiring can be sized from 16 to 22
AWG depending on the application.
5. The maximum length of wire from the thermostat to all
remote sensors should not exceed 300 feet (100
meters).
INSTALLATION
Install the remote indoor sensor on an inside wall
approximately 54 inches (1372 mm) from the floor (or in
the specified location) to allow exposure to the average
room temperature. Do not mount the remote indoor sensor

Summary

Indoor Remote Sensor Installation Instructions

Warning and Safety Precautions

Crucial safety warnings regarding improper installation, alteration, service, and maintenance.

Pre-Installation

Cover Removal

Step-by-step guide on how to remove the remote indoor sensor cover from its sub-base.

Electrical Wiring Practices

Wiring Recommendations for Thermostats

Guidelines for wiring, shielding, wire gauge, and length for various thermostat models.

Installation

Sensor Mounting Location

Details the placement and mounting of the remote indoor sensor for accurate room temperature readings.

Mounting Options and Dimensions

Describes installation on walls, conduit boxes, or outlet boxes, including sensor dimensions.

Wiring

Terminal Block Wiring

Instructions for connecting wires to terminal blocks, including multi-wire handling.

Room Sensor Wiring Diagram

Illustrates the correct wiring between the remote sensor and the thermostat.

Multiple-sensor Installations

Temperature Averaging Wiring

Details wiring configurations for using multiple sensors to achieve temperature averaging.

Sensor Specifications

Compatibility and Operating Range

Specifies compatible controllers, operating temperature range, and humidity limits.

Temperature Resistance Curves

Presents resistance curves for 10K ohm and 20K ohm NTC temperature sensors.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

This document describes the installation and specifications for Lennox Indoor Remote Sensors, specifically models 10K OHM (47W37) and 20K OHM (47W36), used with commercial HVAC systems. These sensors are designed to provide accurate indoor temperature readings to compatible thermostats and controllers, ensuring proper system operation and comfort.

Function Description:

The Lennox Indoor Remote Sensors are passive temperature sensors that measure the ambient air temperature in a room and transmit this data to a connected thermostat or controller. This allows the HVAC system to maintain a desired temperature setpoint based on the actual conditions in the occupied space. They are particularly useful in commercial settings where the thermostat might not be located in an optimal sensing area, or where multiple sensors are needed to average temperatures across a larger space. The sensors utilize a snap-fit locking mechanism for easy cover removal during installation and maintenance.

Important Technical Specifications:

• Models:
  • 10K OHM (47W37): Furnished with a 10K ohm nonlinear NTC temperature sensor.
  • 20K OHM (47W36): Furnished with a 20K ohm nonlinear NTC temperature sensor.
• Operating Temperature Range: 45 to 99°F (10 to 37.2°C) for the 10K OHM sensor and 45 to 99°F (7.2 to 38.2°C) for the 20K OHM sensor.
• Relative Humidity: 5% to 95% non-condensing.
• Dimensions: 3" W x 4.56" H x .88" D (76mm W x 116mm H x 22mm D).
• Compatibility:
  • Honeywell W7760C DDC Controller (29M4801).
  • Thermostats 14W81 or 13H15.
  • Commercial Touch Screen Thermostats (specific wiring guidelines apply).
  • ComfortSense 7500 Commercial Thermostat (13H15).
  • ComfortSense 8500 (14X55 and 14X56).
• Wiring Recommendations (Typical Commercial Touch Screen Thermostats):
  • Wiring should be kept at least one foot away from large inductive loads (motors, line starters, lighting ballasts, power distribution panels).
  • Shielded cable is required if the one-foot separation cannot be maintained.
  • Shield ground should only be connected to the grounded controller case.
  • Wire size: 16 to 22 AWG (1.31 to .34 mm²) depending on the application.
  • Maximum wire length between sensors or from thermostat to sensor: 1000 feet (305 meters).
  • Twisted pair wire is recommended for runs longer than 100 feet (30.5 meters).
• Wiring Recommendations (ComfortSense 7500/8500 Thermostats):
  • Maintain at least one foot separation from large inductive loads.
  • Do not use shielded cabling.
  • Use standard two-wire thermostat wire.
  • Indoor sensor wiring size: 16 to 22 AWG.
  • Maximum wire length from thermostat to all remote sensors: 300 feet (100 meters).
• Terminal Block Capacity: Screw-type terminal blocks are designed for a maximum of one 16 AWG (1.31 sq. mm²) conductor. For multiple wires (16-18 AWG), a wire nut and pigtail connection are required.

Usage Features:

• Optimal Placement: Sensors should be installed on an inside wall, approximately 54 inches (1372 mm) from the floor, to ensure exposure to the average room temperature.
• Avoidance of Interference: Do not mount sensors on outside walls, walls containing water pipes, near air ducts, registers, lights, appliances, or direct sunlight, as these can lead to inaccurate readings.
• Mounting Flexibility: Can be installed directly on a wall using appropriate screws for the wall material, or on a standard utility conduit box (using No. 6 screws), or a 60 mm wall outlet box (using 3.5 mm screws).
• Multi-sensor Installations: The system supports multiple sensors for temperature averaging, requiring an equivalent resistance of 20K ohms at the thermostat. Specific wiring diagrams are provided for these configurations.
• Wiring Practices: Detailed instructions are provided for proper wiring, including stripping insulation, twisting multiple wires, and securing connections to prevent erratic system operation due to electrical interference (noise).
• Temperature Resistance Curves: The manual includes graphs illustrating the temperature-resistance relationship for both the 10K Ohm and 20K Ohm sensors, which are crucial for understanding their operational characteristics and for troubleshooting.

Maintenance Features:

• Easy Cover Removal: A snap-fit locking mechanism allows for simple removal of the sensor cover using a thin, flat blade screwdriver, facilitating access for wiring or inspection.
• Secure Reattachment: The cover snaps back into place, ensuring a secure fit after installation or maintenance.
• Professional Installation Requirement: Installation, adjustment, alteration, service, or maintenance must be performed by a licensed professional HVAC installer or service agency to prevent property damage, personal injury, or loss of life.
• Wiring Verification: After installation, it is important to verify the remote indoor sensor wiring and ensure the thermistor is correctly in place.
• Compliance: All wiring must comply with local electrical codes and ordinances, or as specified on installation wiring diagrams, ensuring safe and compliant operation.

Lennox 47W36 Specifications

General

Brand	Lennox
Model	47W36
Category	Accessories
Language	English