DR is a serie of Digital Room Thermostats, provides a single stage, temperature control. Table 1 shows all the available models. All models can be provided with 24, 120, 220 Vac.
Model | Operation | Cooling / Heating | Compressor delay |
01 | cool + sweep | Compressor | yes |
02 | cool + sweep | Chilled water | no |
03 | cool – fan – dry | Compressor | yes |
04 | cool – fan – dry | Chilled water | no |
05 | cool – fan – dry – heat – auto | Compressor / Heat pump | yes |
06 | cool – fan – dry – heat – auto | Compressor / Electric heater | yes, only for cool |
07 | cool – fan – dry – heat – auto | Hot / Chilled water | no |
These thermostats are mercury free and require no battery. All set points are kept permanently by non-volatile memory
Fig. 1. Digital Room Thermostat.
Model No. Legend
When ordered, put all the information in the Model No. Legend.
POWER SUPPLY | |
24 VAC system | 18 – 30 VAC, 50/60 Hz |
120 VAC system | 96 – 144 VAC, 50/60 Hz |
220 VAC system | 198 – 250 VAC, 50/60 Hz |
TEMPERATURE : | |
Temperature accuracy | ± 1 °C |
Storage temperature | 0 – 70 °C |
Ambient temperature | 10 – 50 °C |
Setting temperature range | 18 – 30 °C (64 – 88 °F) |
HEAT and COOL RELAY : ( P1, P2) | |
Rating (resistive load) | |
· Maximum switching capacity | 3 A 277 VAC |
FAN RELAY: (P3, P4, P5) | |
Rating (resistive load) | |
· Maximum switching capacity | 2 A 277 VAC 3 A 125 VAC |
Read these instructions thoroughly before installing product. Failure to follow these instructions could damage the product or cause a hazardous condition. Check the voltage and current ratings on the product to ensure that it is suitable for your application. Installer must be a trained, experienced service technician. Check product for proper operation after installation.
CAUTION
Damage to heating and cooling system may occur. Disconnect power from the equipment at the main breaker/fuse block while installing the thermostat.
Mounting Location
Mount the thermostat approximately 5 ft. (1.5m) above the floor in a location that is free from direct sunlight, heat from appliances, hot or cold air from ducts, concealed pipes and chimneys, and drafts or dead spots behind doors or in corners. Do not mount on exterior wall, if possible. Failure to locate the thermostat mounting as indicated will result in poor temperature control.
Note: Level thermostat mounting is for appearance only and is not required for proper thermostat operation.
All thermostats are factory set up according to the Model No. Legend is listed on the back side of the plastic casing. However, it can be alternated by the programming.
Press and hold TEMP D and TEMP Ñ and FAN buttons at the same time for 3 seconds, the display will show the existing set up as per Table 2.
Display | Not blinking | Blinking |
P1 | Heat /Cool | Cool |
P2 | Electric heater | No electric heater |
P3 | °F | °C |
P4 | No compressor delay | Compressor delay |
P5 | Sweep | No sweep |
P6 | Wireless | Wire |
Note: P6 is not used in this serie.
Example 1: the display shows P1 without blinking means the set up is now for Heat / Cool version.
Change the setup
Note : If the POWER button is pressed before exiting from the setup mode (Section d above), the system will exit from the existing mode without changing the setup program.
Power
Press POWER to turn on/off the air conditioner. When turn on, it will operate according to the last program setting.
Mode/Sweep
For the Cool + Sweep version, the button is a SWEEP button used to turn on/off the sweep motor. For other versions, this is a MODE button used to select the operation mode.
Fan
Press the FAN button to select the fan speed in the following sequence
Auto mode
The speed will be adjusted according to the difference between the room and the setting temperature.
Temperature setting
Press TEMP
Compressor delay
In a model with a compressor delay feature, there will be a 3-minute time delay before the compressor can restart.
Compressor status
LED at shows the status of the compressor/valve/heater.
Sensor Error Alarm
If the room sensor is open/short-circuit, the controller will stop the compressor or any heating equipment and dot on the 7-segment will blink.
Auto Restart
All the setting parameters are kept in the nonvolatile memory. When there is a power failure and back to normal, the system will resume its operation with the same setting parameters.
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