Saturday, July 19, 2008

Superheat Control with EC3-X Controllers

The EC3-X controllers, together with the electrical control valves EX4, EX5, EX6, EX7 and EX8 take care of stable superheat control.
The pressure and the temperature of the refrigerant at the evaporator outlet are used as input signals. The controller calculates the opening of the electrical control valve [ECV] and generates the signal to drive the stepper motor. In the case of power loss, the electrical control valve is closed to protect the compressor from being flooded. To do this, a rechargeable Lead-Gel battery is built into the controller. An additional solenoid valve is no longer necessary. The refrigerant request signak us fed into the EC3-X controller through a digital input. This input is also used for temperature control and valve control.

Friday, July 18, 2008

EX4, EX5, EX6, EX7, EX8 Series Electrical Control Valves [ECV]

Since many years ago, Emerson has been producing the EX Series electrical control valves. The valves are a completely new design compared to thermal expansion valves. Produced out of high quality materials, they set new standards with respect to control stability, lifetime and corrosion resistance. The very popular family has been recently expanded to cover the rising demand for bi-low heat pumps. Today all valves [except EX8] are available in bi-low versions and allow refrigerant flow in both directions.

Thursday, July 17, 2008

Driving Directions To Our Location

FROM TUAS
1. Head northwest on Jalan Ahmad Ibrahim toward Tuas West Rd 0.2 km
2. Make a U-turn at Tuas West Rd (signs for City/AYE/PIE/KJE) 83 m
3. Take the ramp onto Ayer Rajah Expy 1.9 km
4. Take the exit toward PIE/KJE 1.0 km
5. Merge onto Pan Island Expy/PIE 31.5 km
6. Take the exit toward Jalan Eunos 0.4 km
7. Turn right at Jalan Eunos 0.8 km
8. Slight left to stay on Jalan Eunos 38 m
9. Slight left at Sims Ave E 0.6 km
10. Turn right at Lorong Melayu 0.2 km
11. Turn right at Changi Rd 17 m

FROM AIRPORT
1. Head northeast on Airport Blvd 0.2 km
2. Slight right to merge onto T2 Blvd 0.2 km
3. Make a U-turn 0.4 km
4. T2 Blvd turns slightly left and becomes Airport Blvd 0.5 km
5. Continue on E Coast Pkwy 0.6 km
6. Merge onto Pan Island Expy/PIE via the ramp to TPE/SLE 9.9 km
7. Take the exit toward Jalan Eunos 0.4 km
8. Turn left at Jalan Eunos 0.6 km
9. Slight left to stay on Jalan Eunos 38 m
10. Slight left at Sims Ave E 0.6 km
11. Turn right at Lorong Melayu 0.2 km
12. Turn right at Changi Rd 17 m

FROM KEPPEL DISTRIPARK
1. Head southwest on Kampong Bahru Rd 0.3 km
2. Turn left to stay on Kampong Bahru Rd 0.5 km
3. Turn left at Keppel Rd 0.6 km
4. Take the ramp on the right to ECP 0.5 km
5. Merge onto ECP 9.9 km
6. Exit onto Still Rd S 2.1 km
7. Continue on Jalan Eunos 0.2 km
8. Turn right at Sims Ave E 0.6 km
9. Turn right at Lorong Melayu 0.2 km
10. Turn right at Changi Rd 17 m

FROM WOODLANDS
1. Head west on Woodlands Square toward S Woodlands Way 84 m
2. Slight left at S Woodlands Way 0.1 km
3. Turn left at Woodlands Avenue 5 0.3 km
4. Turn right at Woodlands Avenue 2 0.7 km
5. Take the ramp to SLE/CTE/TPE 0.5 km
6. Merge onto Seletar Expy/SLE 8.7 km
7. Take the exit on the right toward City 0.9 km
8. Merge onto Central ExpyPartial toll road6.7 km
9. Take the exit toward PIE 0.6 km
10. Merge onto Pan Island Expy/PIE 4.9 km
11. Take the exit toward Jalan Eunos 0.4 km
12. Turn right at Jalan Eunos 0.8 km
13. Slight left to stay on Jalan Eunos 38 m
14. Slight left at Sims Ave E 0.6 km
15. Turn right at Lorong Melayu 0.2 km
16. Turn right at Changi Rd 17 m

Control Valve that replaces a solenoid valve and a thermal expansion valve

A refrigeration system with electronic superheat control requires less mechanical components, because the electrical control valve combines the function of the expansion valve and the solenoid valve. The installation is much much easier because less mechanical components are used.

Wednesday, July 16, 2008

We are here @1.31849,103.910687 - Check Google EARTH Maps


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EX Series Heat Reclaim Control

R22 applications.

11kW --- EX6 heat reclaim control and EXD-U.. universal controller.
39kW --- EX7 heat reclaim control and EXD-U.. universal controller.
119kW --- EX8 heat reclaim control and EXD-U.. universal controller.

Tuesday, July 15, 2008

EX series Condensing Pressure and Liquid Regulator


R22, applications.

18kW --- EX5 Liquid mass flow control and EXD-U.. universal controller.
43kW --- EX6 Liquid mass flow control and EXD-U.. universal controller.
153kW --- EX7 Liquid mass flow control and EXD-U.. universal controller.
463kW --- EX8 Liquid mass flow control and EXD-U.. universal controller.

Monday, July 14, 2008

EX series Suction Pressure / Crankcase pressure regulator


R22, Minimum Evaporating Temperature -50 deg C.

3.9kW --- EX6 capacity control and EXD-U.. universal controller
14kW --- EX7 capacity control and EXD-U.. universal controller
42kW --- EX8 capacity control and EXD-U.. universal controller

Sunday, July 13, 2008

EX Series Hot gas bypass regulator components


R22, Minimum evaporating temperature -100 dec C.

4.9 kW EX4 capacity control and EXD-U.. univeral controller
16kW EX5 capacity control and EXD-U.. univeral controller
37kW EX6 capacity control and EXD-U.. univeral controller
131kW EX7 capacity control and EXD-U.. univeral controller
399kW EX8 capacity control and EXD-U.. univeral controller

Saturday, July 12, 2008

Electrical control valves and applicable controllers


Refrigeration, Air-Conditioning, Water Chillers.

Minimum evaporating temperature -100 deg C
2kW ....16.5kW for R22, EX4 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.
5kW ....50kW for R22, EX5 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.
15kW ....120kW for R22, EX6 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.

Minimum evaporating temperature -50 deg C
35kW ....330kW for R22, EX7 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.
90kW ....880kW for R22, EX8 expansion valve, EC3-X.. Superheat controller and EC3-3.. cold room controller.

Wednesday, July 09, 2008

Universal stepper motor control EXD-U

The universal stepper motor control EXD-U is used in all other commercial refrigeration and air-conditioning applications. Opening of the electrical control valve follows exactly the analog input signal of 0 ....10V or 4.... 20mA. The digital input signal is used to close the valve independently from analog input. When the digital signal switches the controller on again, the valve opens to the opening specified by the analog input. The optional selectable 'Start mode' first opens the valve 1/3 opening and then to the analog set point.

Tuesday, July 08, 2008

Advantages of EX Series Electrical Control Valves - Part 1

Valve seat and slider are made out of solid ceramic. Positive shut-off function eliminate the need for additional solenoid valve. The special form of the valve slide provides for proper floating through the valve and highly linear capacity characteristic between 10% and 100% of maximum capacity.

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Monday, July 07, 2008

Superheat controller EC3-X33 with built-in backup battery and display unit ECD-002

The new electronic superheat controllers EC3-X33 control the superheat at the evaporator. A complete system consisting of electric control valve, superheat controller, temperature and pressure sensor controls the superheat exactly to set point, independent from condensing pressure. The MOP function protects the compressor from dangerous overload conditions. The positive shut-off function eliminates the use of an additional solenoid valve, because the built-in backup battery closes the valve after power is lost. The controller can be easily adjusted for each refrigerant and valve type.

Sunday, July 06, 2008

The Electronic Controllers from Emerson

The controller is responsible for the various control tasks. Emerson controllers are optimized for the requirements of refrigeration and air-conditioning and perform all control tasks which have been performed by conventional valves in the past, as superheat control or capacity control.

Wednesday, July 02, 2008

How energy is saved by applying electrical control valves?

The recent energy price increases caused an explosion in the system operating cost. Reducing energy consumption saves money and as a beautiful side effect protects the environment.

Refrigeration and air-conditioning systems belong to the big energy consumers all over the world. Means to reduce the energy consumption have a strong effect on the cost.

Under full load conditions or fixed condensing pressure, conventional, as well as electronic systems operate efficiently. Under partial load or floating condensing pressure, which happens at low ambient temperature (e.g. at cloudly weather, at night, in spring, fall or winter) the condensing pressure decreases. In this case, thermal expansion valves tend to oscillate, which decreases their lifetime. Systems with electronic valves and controllers operate in partial load in the same exact and stable manner as under load. This potential to save energy is best at low condensing pressure.
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