Aiko CTH3-200 Manuale Utente

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A programmable, 7-day programming, modulating 
thermostat can be installed to supply an analog (4-
20mA) or (2-10Vdc with 500 Ohm resistor) control 
signal to dictate the heater(s) firing rate. The 
thermostat shall energize the T24 and T25 (R and 
W) terminals. For thermostat wiring, 

Figure 29 and Page 50, Figure 30. Optional room 
sensors (P/N 10081520) and outdoor air sensors 
(P/N 10081521) are available.

Room temperature averaging networks can be 
created with up to nine room sensors (P/N 
10081520). Refer to thermostat installation 
instructions for wiring.

If LonWorks

®

 communication is required, a 

modulating thermostat can be installed to supply an 
analog (4-20mA or 2-10Vdc) signal to control the 
heater(s) firing rate. For thermostat wiring, 

49, Figure 29 and Page 50, Figure 30. Optional room 
sensors (P/N 10081520) and outdoor air sensors   
(P/N 10081521) are available for this thermostat, as 
well. 

The modulating thermostat with LonWorks

®

 provides 

networking capability in a LonWorks

®

 system. 

Communications port running at 78 kilobits per 
second (kbs), this thermostat can be configured to 
perform a variety of activities in which data is sent or
received on the LonWorks

®

. Information that can be 

shared, viewed and modified with network includes:

• Current year, month, day, hour, minute, second.
• System Mode.
• Space Temperature
• Outdoor air temperature
• Current setpoint
• Occupied/Unoccupied schedule commands.
• Space Temperature

If BACnet

®

 communication is required, a BACnet

®

 

enabled modulating thermostat can be installed to 
supply an analog output (0-10VDC) signal control to 
dictate the heater(s) firing rate. For thermostat wiring, 
See Page 51, Figure 31. 
This thermostat is a flexible wall-mounted stand-
alone control with combined controller/sensor. 
Temperature sensing is standard with optional 
humidity and motion sensing. BACnet

®

 connections 

allow integral peer to peer BACnet

®

 MS/TP LAN 

network communications with configurable baud 
rates and can easily integrate with a building 
automation system.

Connect the -A terminal in parallel with all other -A 
terminals on the network and the +B terminal in 
parallel with other +B terminals. 

The thermostat will control the heater(s) firing rate 
based on the demand signal communicated from 
thermostat program taking into account space 
temperature. The thermostat will energize T25 (W) 
terminal. At high heat, a demand signal will turn the 
heater(s) on at maximum heater(s) firing rate. Once 
the room temperature gets close to the thermostat 
set point,  then the thermostat program will slow the 
heater(s) firing rate down until the room temperature 
reaches the thermostat set point.