GREYSTONE TLDF Series Flexible Cable Duct Average Low Limit Thermostat Instruction Manual
- October 30, 2023
- Greystone
Table of Contents
Flexible Cable Duct Average
Low Limit Thermostat
TLDF Series – Installation Instructions
INTRODUCTION
The flexible cable duct average temperature thermostat incorporates numerous precision thermistor temperature sensors and provides a Form C relay output (NO/NC) with an adjustable setpoint. The sensors are encapsulated at equal distances along the cable assembly and is available in various lengths. All probes provide excellent heat transfer, fast response and resist moisture penetration. Two enclosure styles are available.
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 temperature sensor installs directly into any air duct with several
lengths available for a wide range of duct widths/diameters. Please select a
suitable installation area in the middle of the duct wall. To achieve the best
reading, do not place in an area where air stratification may be present.
Mount the sensor at least 1.5 m (5 ‘) in either direction from elbows,
dampers, filters or other duct restrictions. Avoid areas where the sensor is
exposed to vibrations or rapid temperature changes.
Once a suitable spot is selected, drill a 9.5 – 12 mm (3/8” – 1/2“) hole for
the probe.
Unroll the sensing cable probe, being careful not to kink the wire and feed
into the drilled hole until the enclosure is flush against the duct.
The airflow direction is not important. Secure the enclosure to the duct with
two #10 x 25 mm (1”) self tapping screws (not provided). Tighten screws until
the enclosure is tight against the duct and that there is no movement of the
enclosure as shown in Figure 1. A foam gasket on the back of the enclosure
provides a tight seal against any air leaks.
Install two lengths of hanger strap, securing to the floor and ceiling of the
duct.
The cable probe can easily be shaped to fit any duct size but observe a
minimum bend radius of 4” to prevent damage to the wire or sensors. Criss-
cross the duct multiple times so that the probe covers a large section of the
duct. The cable probe needs to be fastened onto hangers using tube clamps or
wire ties and should be secured every 100 cm or 3′ maximum to prevent movement
of the wire and prevent wear. If sensor is to be used in high velocity or
vibration environment use of rigid style duct probe is recommended. See Figure
2.
The enclosure has a hinged cover with a latch. Open the cover by pulling
slightly on the latch on the right side of the enclosure. At the same time
pulling on the cover, as illustrated in Figure 3. A 1/2″ NPT threaded
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. A 1/2″
NPT to M16 thread adapter and cable
gland fitting is available. Make wire connections as per the “Wiring”
illustrations on Page 2.
Swing door closed until securely latched. For added security, two 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 7.
- 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 8.
- 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 8.
- 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 9.
- The setpoint differential has 3 jumper selectable settings (Low/Mid/High). Set jumper to desired differential as shown in Figure 11.
- To set the switching setpoint, turn the setpoint potentiometer to the desired temperature setting as shown in Figure 10.
- Once all connections settings are made and checked, power can be applied.
SPECIFICATIONS:
Power Supply: …………………………………..12 to 28 Vac/dc
Consumption: …………………………………..50 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
Setpoint Operation: ………………………..Single-turn knob-pot on PCB
Adjustable Setpoint: ……………………….-4 to 10°C (25 to 50°F)
Setpoint Temperature:……………………Low/Mid/High jumper selectable Differential 1.1,
2.8, 5.6°C (2, 5, 10°F)
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: …………………….-20 to 60°C (-4 to 140°F)
Probe Material: …………………………………304 Series Stainless Steel
Probe Diameter:……………………………….6 mm (0.236″)
Probe Length: …………………………………..1800mm, 3600mm, 6100mm, 7300mm (6′, 12′, 20′,
24′)
Wire Material: ……………………………………FT-6 Plenum-rated cable
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
IN-GE-TLDFXXX-003
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853 3057 Web: www.greystoneenergy.com