TC500A Commercial Touchscreen Thermostat is designed to be wall-mounted indoors. Mount in a clean, dry location away from windows, air ducts, and other places where environmental factors may affect temperature and humidity readings. If you mount the Thermostat on the interior of an outside wall, thoroughly insulate so outside air behind the sensor does not affect the sensor reading.
To meet the requirements of the Americans with Disabilities Act, mount no higher than 48″ from the floor and with a minimum clear floor space of 30″ X 48″ (760 X 1220 mm).
Supported Documents
When installing this product
WARNING Electrical Shock Hazard.
Can cause severe injury, death or property damage.
Disconnect the power supply before beginning installation to prevent electrical shock and equipment damage. More than one power supply may have to be disconnected.
MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control. If you have questions, contact Honeywell Customer Care Center.
Do not install the Thermostat unit where it can be affected by:
IMPORTANT To avoid electrical interference, which can cause erratic performances, keep wiring runs as short as possible and do not run thermostat wires adjacent to the line voltage electrical distribution systems. Use shielded cable. The cable shield must be grounded only at the controlled equipment case.
WHEN USED TO SENSE ROOM TEMPERATURE
Install the Thermostat about 4 ft. (1.2m) above the floor in an area with good air circulation at average temperature. (See Fig. 1). Confirm mounting height meets Americans with Disabilities Act requirements.
WHEN NOT USED TO SENSE ROOM TEMPERATURE
When using the remote-mounted temperature (and humidity) sensor(s) to sense ambient conditions, install the Thermostat in an area that is accessible for setting and adjusting the temperature and settings.
WEEE (Waste of Electrical and Electronic Equipment)
This symbol on our product shows a crossed-out “wheelie-bin” as required by law regarding the Waste of Electrical and Electronic Equipment (WEEE) disposal. This indicates your responsibility to contribute in saving the environment by proper disposal of this Waste i.e. Do not dispose of this product with your other wastes. To know the right disposal mechanism please check the applicable law. Regulation (EC) No 1907/2006
According to Article 33 of Reach Regulation be informed that the substances listed below may be contained in these products above the threshold level of 0.1% by weight of the listed article.
Product/Part Code | Substance Name | CAS Number | |
Only TC500A thermostat | Lead | 7439-92-1 | |
mainboard PCBA, thermostat wall plate board | |||
Lead oxide | 1317-36-8 | ||
PCBA |
The thermostat uses 24VAC power from a UL Listed Class-2 24VAC transformer (not provided in the kit). It also uses a half-wave rectifier to convert the AC power supply to onboard power. This enables multiple devices with half-wave power supplies to be powered from a single, grounded transformer.
WARNING Half-wave devices and full-wave devices must not use the same AC transformer.
You must maintain wiring polarity. Failure to do so can result in equipment damage. If the HVAC equipment has an internal circuit board that is powered by the same transformer that will power the Thermostat, verify that it is NOT full wave.
Long power supply wiring runs require selecting the wire gauge appropriately. If the wire gauge is inadequate the increased resistance and associated voltage drop may result in the insufficient voltage supply to the Thermostat. The recommended wire gauge guidelines are as follows.
Every relay output is N.O. (Normally Open) contacts with a maximum switch rating of 24VAC @1A (24VA). The allowed maximum load is 96VA, which assumes all 8 relay output loads are powered from the controller transformer. Actual power requirements depend on connected loads.
IMPORTANT Transformer sizing should never exceed the maximum UL Class 2 rating.
The 24VAC secondary leads are not interchangeable. Once a lead connects to the GND terminal, it is the grounded lead. Observe and maintain polarity for subsequent connections. The GND terminal provides a reference ground for the circuit board and communications wiring. Use 18 AWG cable for best results.
WARNING Ensure that all Thermostat power, communications, and I/O cabling are connected to C or COM according to these instructions. Failure to follow these instructions may result in Thermostat operational and communication failures or equipment damage.
Detaching the wallplate from the display
The thermostat is an assembly of a wallplate and a display. It must be disassembled before starting the mounting procedure.
Mount the wallplate vertically on the wall. It supports 18-22 AWG (0.5-0.75mm2) wires.
NOTE: If you are using a TC500A Deco plate for thermostat mounting, refer to the Deco plate pocket guide (31-00457M) also.
Mounting the wallplate on the junction box (optional)
The thermostat wallplate can be mounted vertically on a US 2”*4” or UK 75*75mm junction box.
NOTE: If you are using other than US 2”*4” or UK 75*75mm junction boxes, then a TC500A Deco plate can be used for thermostat mounting. Refer to the Deco plate pocket guide (31-00457M).
Table 1. Accessories Part Numbers
Decoplate-N | TC500 deco plate for NA junction boxes |
Decoplate-W | TC500 deco plate for Global junction boxes |
WARNING Do NOT wire the thermostat to line voltage.
IMPORTANT Remove R to RC jumper only for 2 transformer systems
Table 2. Terminal identification
Terminal | Label | Connection |
24VAC | R | 24VAC power from heating Class 2 transformer |
C | 24VAC common (Neutral). For 2 transformer systems, use common wire from the cooling transformer | |
UIO1 | 1 | Universal input/output |
COM | Common |
Terminal | Label | Connection |
UIO2 | 2 | Universal input/output |
COM | Common | |
UI1 | 1 | Universal input |
COM | Common | |
UI2 | 2 | Universal input |
COM | Common | |
Sylk | | Sylk bus, master, power output |
| Sylk bus, master, power output | |
RS485 | + | BACnet Communications (coming soon) |
_ | BACnet Communications (coming soon) | |
R-RC | Jumper between R and RC for single transformer system, remove the jumper in two transformer system. | |
24VAC | RC | 24VAC power from cooling Class 2 transformer |
G | Fan | |
Y1 | Relay output, Compressor contactor (stage1) | |
Y2 | Relay output, Compressor contactor (stage2) | |
Y3 | Relay output, Compressor contactor (stage3)/Configurable Output | |
W1 | Relay output, Heat (stage1) | |
W2 | Relay output, Heat (stage2) | |
W3 | Relay output, Heat (stage3)/Configurable Output | |
Aux | | Relay dry contact, Aux-1 |
| Relay dry contact, Aux-2 |
IMPORTANT All wiring must comply with local electrical codes and ordinances.
NOTE: Supports 18-22 AWG (0.5-0.75mm2). Solid wire is recommended.
Follow equipment manufacturer wiring instructions when available. A letter code is located near each terminal for identification.
CAUTION Power must not be connected while wiring. Wiring a unit that is powered may result in electrical shock and/or equipment damage.
After all wiring is completed, install the display onto the wallplate.
Honeywell Building Technologies
Honeywell
715 Peachtree Street NE
Atlanta, GA 30308
customer.honeywell.com
buildingcontrols.honeywell.com
® U.S. Registered Trademark
© 2021 Honeywell International Inc. 31-00399M-02 | Rev.03-21
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Honeywell TC500A Commercial Thermostat MOUNTING INSTRUCTIONS
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