Vtronix TF85L –10011 Digital Room Thermostat INSTALLATION MANUAL

Vtronix TF85L –10011 Digital Room Thermostat

APPLICATION

The TF85L Thermostat provides 24VAC single stage temperature control of 2 pipe and 4 pipe fan-coil applications with automatic control of a 3 speed fan along with manual heat/cool changeover. The TF85L Thermostat is mercury free and requires no batteries. All set points are retained permanently in non-volatile memory in case of a power interruption.

WARNING

• Improper installation, adjustment, alteration, service, maintenance or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury, death or property damage.
• Observe all warning and caution notices in this document and those posted on the equipment.
• Wear safety glasses, gloves and protective clothing.
• Do not operate equipment or apply electrical power without panels in place.
• Normal system operation will cause some components and surfaces to become hot and can cause burns.
• Before installing, modifying or servicing system, main electrical disconnect switch must be in the OFF position.
• There may be more than one disconnect switch. Lock out and tag switches with a suitable warning label. Electrical shock can cause personal injury or death.
• All electrical power should be turned off when servicing or repairing electrical components.
• Extreme caution should be observed when trouble shooting electrical components when power is applied.
• Observe all warning notices posted on equipment.

Specification

POWER SUPPLY
24 VAC system	18 – 30 VAC, 50/60 Hz
TEMPERATURE :
Temperature accuracy	± 1.8 °F
Storage temperature	32 – 158 °F
Ambient temperature	50 – 122 °F
Setting temperature range	64 – 85 °F
Deadband (Auto changeover model)	± 1 °F of Setpoint
HEAT and COOL RELAY : ( P1, P2)
Rating (resistive load)
·     Maximum switching capacity	3 A 277 VAC
·     Delay Time	1 minute or 3 minutes (default)
FAN RELAY: (P3, P4, P5)
Rating (resistive load)
Maximum switching capacity	2  A 277 VAC 3  A 125 VAC

Installation

Read these instructions thoroughly before installing product. Failure to follow these instructions could damage the product or cause a hazardous condition. Check the voltage and current ratings on the product to ensure that it is suitable for your application. Installer must be a trained, experienced service technician. Check product for proper operation after installation

Mounting Location
Mount the thermostat approximately 5 ft. (1.5m) above the floor in a location that is free from direct sunlight, heat from appliances, hot or cold air from ducts, concealed pipes and chimneys, and drafts or dead spots behind doors or in corners. Do not mount on exterior wall, if possible. Failure to locate thermostat mounting as indicated will result in poor temperature control.

Note: Level thermostat mounting is for appearance only and is not required for proper thermostat operation

• Using the mounting bracket base as a guide, mark two mounting holes on the wall. Drill two mounting holes. Place anchors (provided) into the holes until flush with the hole. Position bracket on the wall and insert the wires from the heating and cooling equipment through the wiring hole. Holding the bracket in place on the wall, secure it to the wall using mounting screws (provided). Mount thermostat to the mounting bracket.

• Color-coded 18-22 gauge wire is recommended for wiring. All wiring must follow local electrical code. Loosen the terminal screw on the thermostat, strip the wire and connect the wire Firmly tighten terminal screw when finished.
• For mounting thermostat directly on the wall (optional), drill two mounting holes (4-5/16 inch apart). Place anchors into the holes until flush with the hole. Tighten screws and place the thermostat
• Put the cover back.
• Lift and open the cover, pull it up to remove.
• Tighten screw to secure the cover.

WIRING DIAGRAM

SET UP

Press and hold TEMP , TEMP and FAN buttons at the same time for 3 seconds, the display will show the existing set up as per Table 1. Note that all 3 buttons have to be pressed simultaneously.

Note

• For T200 manual changeover, applies in cool mode only.
• For T200 manual changeover, applies in heat mode only

Example 1 : The Display shows P2 steady means the thermostat is set up for Continuous Fan operation.

Change the Set Up Parameters

• While in set up mode, press TEMP D or TEMP Ñ button to go to the required set up parameter.
• To change the setup as listed in Table 1, press FAN button.
• Repeat (a) & (b) for the next set up parameter.
• Press Heat/Cool button to exit from the set up mode.

Note: If POWER button is pressed before exiting from the set up mode (Section d above), the thermostat will exit without changing the setup parameters. P4 setting applies only when P2 is set to Cycled Fan

OPERATION

Power
Press POWER to turn on/off the equipment. The thermostat will operate to the set point stored in non volatile memory.

Heat/Cool (For Manual changeover only)

• Pressing the Heat/Cool button will show whether the thermostat is in Heat or Cool mode.
• To change the current mode, press the Heat/Cool button again while the LED display is flashing.
  • Cool Mode – the LED display will flash “CL” for 5 seconds.
  • Heat Mode – the LED display will flash “HT” for 5 seconds.

Note: This button shows the status for the Auto changeover model. Heat/Cool can not be changed.

Fan

• Press the FAN button to select the fan speed in the following sequence.
• LED will show the status of the fan.

Auto mode

• The speed will be adjusted according to the difference between the room and the setpoint temperature.
• If the difference is 4°F or more, the fan will run at high speed.
• If the difference is 3°F, the fan will run at medium speed.
• If the difference is 2°F, or lower, the fan will run at low speed.

Note: Fan speed defaults to Automatic after 1 hour if it is changed by the user to a particular speed.

Continuous Fan
FAN is always on in High, Medium or Low speeds as long as the thermostat is powered.

Cycled Fan Standard
Fan is on when the heat or cool outputs are on (on cycle). Automatic fan operation is active in the on cycle. When the heat or cool outputs are off (off cycle), the Fan output is off. The Fan LEDs (Auto, High, Med and Low) are all turned off. The Fan button is deactivated in the off cycle. During the on cycle the fan speed can be manually changed. The fan will turn off in the off cycle and revert back to the selected fan speed during the on cycle.

Cycled Fan Override
The fan is on when the heat or cool outputs are on (on cycle). Automatic fan operation is active in the on cycle. When the heat or cool outputs are off (off cycle), the Fan output is off. The Fan LEDs (Auto, High, Med, and Low) are all turned off. The Fan button can be activated in the off cycle. The appropriate Fan LED (High, Med and Low) is turned on and the appropriate output is energized. It stays at this speed during the on-cycle as well as the off-cycle. This is subject to the automatic fan speed default timer.

Warning: This mode should not be selected for hydronic applications with no control valves. Excessive heating can result if the Fan is turned on manually.

Auto Fan Speed Timer
Fan speed defaults back to Automatic after 1 hour (or 3 hours based on P1 flashing setting) if it is changed to a particular speed.

Temperature setting

Press TEMP or TEMP button for setting the temperature in range of 64-85°F. But High and Low setting will depend on P5 and P6. LED at will show the new setting for 5 seconds.

T200 Manual changeover

• In Cool mode, setting range will be 64-85°F or 70-85°F (set in P5).
• In Heat mode, setting range will be 64-85°F or 64-78°F (set in P6).

T201 Auto changeover

• Low setting temperature will be 64°F or 70°F (set in P5).
• High setting temperature will be 85°F or 78°F (set in P6).

System status
LED at turns on when there is a demand for heating or cooling. LED will flash when the delay time is activated. The default system delay time is 3 minutes.

Sensor Error Alarm
If the thermostat temperature sensor is defective, the thermostat will turn off the equipment and start flashing “SE” on the display.

Auto Restart
All the setup parameters are stored in non-volatile memory. When there is a power failure and returns to normal, the thermostat will resume operation with the previous setup parameters

REFERENCE:

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Vtronix TF85L –10011 Digital Room Thermostat INSTALLATION MANUAL

Vtronix TF85L –10011 Digital Room Thermostat INSTALLATION MANUAL