GREYSTONE TLFLF24X01 Flying Lead Low Limit Thermostat Instruction Manual

: June 12, 2024
: Greystone

Table of Contents

GREYSTONE TLFLF24X01 Flying Lead Low Limit Thermostat
Product Information
WIRING
Key Features
Product Usage Instructions
SPECIFICATIONS
DIMENSIONS
References
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GREYSTONE TLFLF24X01 Flying Lead Low Limit Thermostat

GREYSTONE-TLFLF24X01-Flying-Lead-Low-Limit-Thermostat-
product

Product Information

The Flying Lead Low Limit Thermostat (TLFL Series) is a temperature sensor that is designed for single-point temperature monitoring in various applications. It can be used in air ducts or to measure pipe temperature. The thermostat comes with a hinged enclosure with a latch for protection and provides a Form C relay output (NO/NC) with an adjustable setpoint. The sensor is encapsulated in a 6 mm (0.236”) OD X 50 mm (2”), 304 series stainless steel probe. The standard wire length is 3.05m (10’). All probes are constructed to provide excellent heat transfer, and fast response and are potted to resist moisture penetration. A hinged and gasketed Polycarbonate enclosure is provided for ease of installation.

BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the temperature sensor. Failure to follow these instructions may result in product damage. Do not use in an explosive or hazardous environment, with combustible or flammable gases, as a safety or emergency stop device or in any other application where failure of the product could result in personal injury. Do not exceed the device ratings.

MOUNTING

The flying lead sensor can be used in several different types of applications where single-point temperature monitoring is required.
Listed below are some typical applications
The flying lead sensor can be installed directly into any air duct. Select a suitable installation area in the middle of the duct. To achieve the best reading, do not place in an area where air stratification may be present. Avoid areas where the sensor is exposed to
vibrations or rapid temperature changes.
Once a suitable spot is selected, drill a 3/8” hole in the top of the duct and slide the probe through, mount a length of flexible duct hanger from top to bottom of the duct. Mount the probe to the duct hanger using a tube clamp or wire tie. See Figure 1.
The flying lead could also be used to measure pipe temperature. Select a suitable spot along the pipe, remove a small section of insulation if present and set it aside. It is recommended that thermal compounds be used to improve heat transfer. Spread a liberal amount on the pipe. Lay probe in thermal compound and secure sensor to pipe using a worm gear clamp (not included).
For added protection it is recommended to wrap the probe cable around the pipe 1-2 times. Re-install insulation if present, allowing sensor cable to protrude. See Figure 2.
The enclosure has a hinged cover with latch. Open cover by pulling slightly on the latch on the right side of the enclosure. At the same time pulling on the cover, as shown in Figure 3.
A 1/2″ NPT threated connection hole is provided in the bottom of the enclosure. Screw the EMT connector or cable gland connector in until tight. See Figure 4. It is recommended that weatherproof conduit or cable gland fittings be used. An optional 1/2″ NPT to M16 thread adapter and cable gland fitting is available.
Make wiring connections as per the “Wiring” illustrations on Page 2.
Swing door closed until securely latched. For added security, 2 screws are provided that may be installed in the integrated screw tabs. See Figure 5.

WIRING

Deactivate the 24 Vac/dc power supply until all connections are made to the device to prevent electrical shock or equipment damage.
Use 14-22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with wiring used to supply inductive loads such as motors. Make all connections in accordance with national and local codes.
The temperature thermostat comes with the temperature sensor pre-wired to the PCB. If removal is required for installation then it may be re-wired as shown in Figure 6.
Pull at least six inches of control wire into the enclosure, then complete the wiring connection according to the wire diagram for the applicable power supply as shown in Figure 7.
Connect the DC positive or the AC voltage hot side to the PWR terminal. The supply common is connected to the COM terminal. See Figure 7.
The relay has both Normally Open (NO) and Normally Closed (NC) contacts available. The relay output is available on the NO/COM/NC terminal. Make connections before applying power as shown in Figure 8.
The setpoint differential has 3 jumper selectable settings (Low/Mid/High). Set the jumper to the desired differential as shown in Figure 9.
To set the switching setpoint, turn the setpoint potentiometer to the desired temperature setting as shown in Figure 10.
Once all connection settings are made and checked, power can be applied.

Key Features

Flying lead sensor for easy installation
Suitable for air duct or pipe temperature monitoring
Can be used with thermal compounds for improved heat transfer
Includes a hinged enclosure with latch for added protection
Wiring connections are illustrated on page 2 of the manual

Warnings and Limitations

Do not use the thermostat in an explosive or hazardous environment
Avoid using it with combustible or flammable gases
Do not exceed the device ratings
Failure to follow the instructions may result in product damage

Typical Applications

The Flying Lead Low Limit Thermostat can be used in the following applications:

Air duct temperature monitoring
Pipe temperature monitoring

Product Usage Instructions

Mounting the Thermostat in an Air Duct

Select a suitable installation area in the middle of the air duct.
Drill a 3/8″ hole in the top of the duct.
Slide the probe through the hole.
Mount a length of flexible duct hanger from top to bottom of the duct.
Secure the probe to the duct hanger using a tube clamp or wire tie.

Refer to Figure 1 in the manual for a visual representation of the mounting process.

Measuring Pipe Temperature

Select a suitable spot along the pipe.
If insulation is present, remove a small section and set it aside.
Apply thermal compound on the pipe to improve heat transfer.
Lay the probe in the thermal compound and secure it to the pipe using a worm gear clamp (not included).
For added protection, wrap the probe cable around the pipe 1-2 times.

Re-install the insulation if necessary, allowing the sensor cable to protrude. See Figure 2 in the manual for a visual representation of the process.

Enclosure Installation

Open the hinged cover of the enclosure by pulling slightly on the latch on the right side.
If needed, screw the EMT connector or cable gland connector into the provided 1/2″ NPT threaded connection hole at the bottom of the enclosure.
Make wiring connections as per the wiring illustrations on page 2 of the manual.
Close the enclosure’s swing door until securely latched. For added security, use the provided screws on the integrated screw tabs.

Refer to Figures 3, 4, and 5 in the manual for visual representations of the enclosure installation process.

For detailed wiring instructions, refer to Figures 6, 7, 8, 9, and 10 in the manual.

SPECIFICATIONS

Power Supply: 12 to 28 Vac/dc
Consumption: mA max
Relay Contacts: SPDT, Form C contacts (N.O. and N.C.)
- 5 Amps @ 30 Vac/250 Vac resistive
- 1.5 Amps @ 30 Vdc/250 Vac inductive
Relay Action: Activates on temperature fall – Auto reset
Setpoint Operation: Single-turn knob-pot on PCB
Adjustable Setpoint: -4 to 10°C (25 to 50°F)
Temperature Differential :
- Low: 1.1°C (2°F)
- Mid: 2.8°C (5°F)
- High: 5.6°C (10°F) Jumper selectable
Temperature Sensor: 10K ohm curve matched precision thermistor
Sensor Accuracy: ±0.2°C, 0 to 70°C (±0.36°F, 32 to 158°F)
Probe Sensing Range: -40 to 60°C (-40 to 140°F)
Probe Material: 304 Series Stainless Steel
Probe Diameter: 6 mm (0.236″)
Wire Material: FT-6 Plenum-rated cable
Wire Length: 3.05m (10′)
Operating Conditions: -10 to 50°C (14 to 122°F), 5 to 95% RH, non-condensing
Storage Conditions: -30 to 70°C (-22 to 158°F), 5 to 95% RH, non-condensing
Wiring Connections: Screw terminal block (14 to 22 AWG)
Enclosure: Grey Polycarbonate UL94-V0, IP65 (NEMA 4X)
- Optional thread adapter” (1/2″ NPT to M16) and cable gland fitting
Country of Origin: Canada