This digital thermostats are designed for application of 3-speed fan and valves in fan coil system.
Including:
2-pipe cool only/heat only/manual changeover and 4-pipe manual or automatic changeover
Fan speed can be selected to automatic or manual 3-speed control mode. In ventilation mode, fan only support manual speed control.
Model summary
Model | Horizontal/ Vertical | Backlight/ Color Ring | Time on/off | 2-pipe/ 4-pipe | Power supply (V) | Energy Saving | Ventilation | Manual/ Automatic Fan | Remote Sensor |
HTW-51-1000 | |||||||||
-H2BB | Horizontal | Blue | Y | 2/4 | 220 | Y | Y | Y | Y |
-V2BB | Vertical | Blue | Y | 2/4 | 220 | Y | Y | Y | Y |
-H2GG | Horizontal | Green | Y | 2/4 | 220 | Y | Y | Y | Y |
-V2GG | Vertical | Green | Y | 2/4 | 220 | Y | Y | Y | Y |
-H1BB | Horizontal | Blue | Y | 2/4 | 110 | Y | Y | Y | Y |
-V1BB | Vertical | Blue | Y | 2/4 | 110 | Y | Y | Y | Y |
-H1GG | Horizontal | Green | Y | 2/4 | 110 | Y | Y | Y | Y |
-V1GG | Vertical | Green | Y | 2/4 | 110 | Y | Y | Y | Y |
Note: Horizontal models are taken as samples for display, operation and installation pictures shown in below parts.
LCD display
Function Valve control
Thermostat acquires the room temperature via its integrated sensor or external temperature sensor and maintains the setpoint by delivering on/off valve control commands output.
Fan Operation
Fan can be selected as manual or automatic 3-speed operation. In Manual mode, the fan is switched to the selected speed via control output Gh, Gm, Gl. While in automatic mode, fan speed depends on the difference between room temperature and setpoint. When room temperature reaches setpoint, valve will be closed and meanwhile, fan will be closed either.
Four-pipe application
System will have a fixed deadband set in ISU between heating and cooling setpoints for Automatic Change Over (ACO) configured thermostats.While the heating and cooling set points determine the dead band.
If the difference between heating and cooling set points is less than the dead band set in ISU, then the dead band set in ISU is enforced. When adjusting the cooling set point, conflicts will be resolved by moving the heating set point out of the way of the cooling set point (heating set point=cooling set point –dead band set in ISU). When adjusting the heating setpoint, conflicts will be resolved by moving the cooling set point out of the way of the heating set point (cooling set point=heating set point +dead band set in ISU). Heating and Cooling range stops will determine the maximum heating setpoint setting and minimum cooling setpoint setting.
The last system control mode used will determine the mode in ACO when in the deadband.
Temperature display
Cycle per hour (CPH)
Time on/off
Backlight
Keypad lock
The following operating modes are available:
Comfort mode
In comfort mode, the setpoint can be changed by pressing up and down button. Different applications include cool only, heat only and manual heat/cool changeover.
Ventilation mode
Press mode button to enter ventilation mode. In ventilation mode, no output for valve while the fan will operate according to selected fan speed.
Energy saving mode
Freezing protection mode
Freezing protection can be selected as disabled (default) or enabled. In freezing protection mode (no such mode in cool only application), when thermostat is in OFF mode while the acquired temperature is below 6oC, the thermostat will start heat mode until the temperature rises to 8oC or the thermostat is turned on.
On/off mode
Pressing power button can switch between on and off mode.
Terminal Designations
Item | Terminal | Description |
1 | Cc | Cooling close |
2 | Y | Cooling open |
3 | L | AC Power |
4 | Ch/Cc | Heating close/Cooling close |
5 | W/Y | Heating open/Cooling open |
6 | N | AC Ground |
7 | Gh | High speed fan relay |
8 | Gm | Medium speed fan relay |
9 | Gl | Low speed fan relay |
10 | Sc | Ground for remote sensor and remote setback |
11 | RSB | Remote set back |
12 | Rs | Remote sensor |
Application 1: 2 pipes heat only wiring diagram
Application 2: 2 pipes Cool only wiring diagram
Application 3: 2 pipes 1 stage Heat or 1 stage Cool MCO wiring diagram
Application 4: 4 pipes 1stage Heat and 1 stage Cool MCO/ACO wiring diagram
Back cover installation
Install the thermostat about 5 feet (1.5m) above the floor in an area with good air circulation at average temperature.
Do not install in locations where the thermostat can be affected by:
Installer system test
After completing the installer setup above, press the button again to begin a system test Follow the procedure below to test the heating and cooling and fan system.
Press and hold
Press
Press
Press
System Test System Status
Press
Number | Description | Possible Options |
1 |
System type | 0 Heat only |
1 Cool only | ||
2 two pipes 1H1C manual (Default) | ||
4 four pipes manual | ||
5 four pipes auto | ||
5 | Remote sensor | 0 Onboard Sensor (Default) |
1 Remote (NTC20K) | ||
9 | Temperature scale | 0 ºF |
1 ºC(Default) | ||
10 |
Fan control type | 0 Cycle only |
1 Constant only (3 speed: Low->Med->High-> Low) | ||
2 User can choose Cycle or Constant (3 speed: Low->Med->High->Auto-> Low) (Default) | ||
12 |
Sequence Dead band for four pipes | 1 ºC (2 ºF) |
1.5 ºC (3 ºF)(Default) | ||
2 ºC (4 ºF) | ||
3 ºC (5 ºF) | ||
3.5 ºC (6 ºF) | ||
4 ºC (7 ºF) | ||
4.5 ºC (8 ºF) | ||
5 ºC (9 ºF) | ||
13 |
CPH value For Heat | 1 |
2 | ||
3 | ||
4 (default) | ||
5 | ||
6 | ||
7 | ||
8 | ||
9 | ||
10 | ||
11 | ||
12 | ||
14 |
CPH value For Cool | 1 |
2 | ||
3(default) | ||
4 | ||
5 | ||
6 | ||
18 |
Display Temperature adjustment | -2 ºC(-4 ºF) |
-1.5 ºC(-3 ºF) | ||
-1 ºC(-2 ºF) | ||
-0.5 ºC(-1 ºF) | ||
0 ºC(0 ºF) (default) | ||
0.5 ºC(1 ºF) | ||
1 ºC(2 ºF) | ||
1.5 ºC(3 ºF) | ||
2 ºC(4 ºF) | ||
19 | Temperature Display mode | 0 display Room Temperature |
1 display Setpoint | ||
2 display both (default) | ||
20 | Heating Range Stops | 10-32 ºC default 32 ºC (50-90 ºF default 90 ºF) |
21 | Cooling Range Stops | 10-32 ºC default 10 ºC (50-90 ºF default 50 ºF) |
22 |
Keypad Lockout | 0 All keys available(default) |
1 System button Locked out | ||
2 Fan and System button Locked out | ||
3 All buttons locked out | ||
23 | Remote setback enable method | 0 Hotel card NO |
1 Hotel Card NC | ||
2 Button (Default) | ||
24 | Remote setback heating setpoint | Range 10-21ºC Default : 18 ºC (Range 50-70ºF Default : 64) |
25 | Remote setback cooling setpoint | Range 22-32ºC Default : 26 ºC (Range 72-90 ºF Default : 79 ºF) |
27 | Freeze Protection | 0 Disabled (default) |
1 Enabled |
If… | Then… |
Heating system does not turn on. |
|
Cooling system does not turn on. |
|
The fan doesn’t work. |
|
The Mode button doesn’t work. |
|
The Fan button doesn’t work. |
|
The Up or Down button doesn’t work. |
|
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