Appendix
Version 3.7 Telephone Access System Installation and Operation Manual 107 (119)
LT-969 Copyright January 2017
8.1 Specifications
8.1.1 Operating Temperature
50°C (122°F) to -20°C(-4°F).
For temperatures where the Telephone Access System will operate below 0°C
(32°F) at any time, install the TH-102K Thermostat Heater within the enclosure.
8.1.2 Telephone Lines
Use only Loop Start telephones (not ground start), check with your local
telephone company.
8.1.3 AC Power Supply
105 Vac to 128 Vac.
Note: Maximum power consumption for an 8-line by 20 character LCD
TX3 Lobby Control Unit is 6.2 Watts.
8.1.4 Power Transformer
Mircom Model PS-4. 16 Vac/ 40 VA, CSA approved Class 2 Power
Transformer.
Mircom Model PS-4P. 16 Vac/ 40 VA, CSA approved Class 2 Power
Transformer, plug-in.
8.1.5 Door Strikes
Select the appropriate door strike as required by your system applications. We
recommend using the following Mircom door strikes below and its compatible
power transformer.
• Mircom Model M-10. DC (silent) or AC (buzzing) Door Strike. (Use PS-
3B transformer)
Note: The door strike must have its own separate power transformer. Do
not tap or use the system power transformers.
The maximum supply for the AC or DC Input Door Strike must not exceed:
• 28 VAC / 1 A max
• 30 VDC / 1 A max
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