Honeywell TC300 Commercial Thermostat Instruction Manual
TC300 COMMERCIAL THERMOSTAT
USING EXTERNAL TEMP./HUM. SENSORS
Power supply guidelines and
requirements
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.
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.
YES
NO
NO
4 FEET
NO
WARNING
(1.2 METERS)
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.
Fig. 1. Typical mounting location of the thermostat
Power Terminals
R
Diode
+ DC Voltage
GND
WEEE
24VAC
C
Capacitor
WEEE (Waste of
Electrical and
Fig. 2. Power terminals
Electronic Equipment)
•
At the end of the product life,
dispose of the packaging and
product in an appropriate recycling
center.
Power supply wire sizing
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 insufficient voltage supply to the Thermostat. The
recommended wire gauge guidelines are as follows.
•
•
Do not dispose of the device with
the usual domestic refuse.
Do not burn the device.
Min. Load = 4VA (all DOs OFF, No Sylk sensor).
If the 14-18AWG wire is used for R, C terminal,
Max. Load = 4A, 96VA (all DOs ON).
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 to 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.
If the 20-22AWG wire is used for R, C terminal
Max. Load = 3A, 72VA (all DOs ON).
If the 24-26AWG wire is used for R, C terminal,
Max. Load = 2A, 48VA (all DOs ON).
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.
DO1, DO2, DO3, DIO1, and DIO2 all relay outputs are
powered from the external transformer. The minimum load
includes Thermostat and analog outputs at full load (Max.
10V voltage output with 2Kohms load).
Substance
Name
CAS
Number
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 5 relay output
loads are powered from the transformer. Actual power
requirements depend on connected loads.
Product/Part Code
Only TC300 thermostat
mainboard PCBA
Lead
Lead oxide
7439-92-1
1317-36-8
IMPORTANT
Use an UL Class 2 rated Transformer or a lesser
capable transformer.
31-00642-01 | Rev. 10-23
2
| General | Details |
|---|---|
| Name | Honeywell TC300 Commercial Thermostat Instruction Manual |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.42 MB |
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