KR-351 Chilled Water Refrigeration System Control Trainer

1. The commonly-used control components of chilled water unit are mounted on the panel layout for easy learning.

2. Three-phase motor is used in place of compressor. The learner can proceed their hands-on practicing step by step from basics like interlocking circuit, motor start-up and control circuit of forward / reverse rotation, to the advanced  exercises such as the complete control circuit of reciprocating / screw type chilled water unit, etc.

3. The used pressure component is triggered by direct vapor-pressurizing so the system can be close to the real one. On the contrary, the traditional components used for teaching in the  past that have to be actuated by bolt or screwdriver can be discarded.

4. The input vapor-pressure, which is divided into 3 mimic pressures like low- pressure, high-pressure and oil pressure, can be used and adjusted separately so the learner would have clearer understanding of  functionality of each component accordingly.

5. The E.O.C.R is built in inner circuit system to ensure  the security and avoid the damage of equipment while wiring error.

6. The equipment is equipped with 3 magnetic switches, 3 auxiliary  relays, 14 indicators, 2 timing relays, 3 different types switches and digital voltage / current meters. Moreover, the learner can use these components to take a lot of practice of low-voltage power control circuit and to test their own designed circuit.

1. Knowledge of electric components

-  Various commonly-used electric components are introduced in detail for teaching purpose including micro circuit breaker, PVPR, timing relay, auxiliary relay, magnetic contactor, thermal relay, current transformer, and voltage /current switch with 3-phase power.

2. Knowledge of protective equipment

-  Not only the function description and instruction about the pressure protective switch that is commonly-used in chilled water unit is offered, but also the instruction manual and operational concept about the HLP, OLP, anti-freeze switch, and temperature switch, etc.  The learner can understand the complete protection measures of chilled water unit.
 
3. Y-Δ manual lower-voltage start control circuit of 3-phase induction motor

-  Students can realize the advantages of lower-voltage during practice and experience the speed change of motor by manual switch. Besides, students would be more familiar with the usage of relays by adopting other electric components.
 

4. Y-Y / Y-Δ circuit of chilled water unit

-  Students can manipulate the Y-Y starting control circuit of small and middle  size chilled water unit as well as the lower-voltage starting circuit used in units above 7.5HP.  They would be more familiar with the usage condition of various protective switches.
 

5. Circuit of chilled water unit

-  The practice for circuit of chilled water unit is almost the same as that of the system in industry. Students would grasp full control concepts about chilled water unit by using the electric components and protective switches.
 

6. Pressure auto-start, manual-start switch circuit, chain circuit practice

-  Students would gradually familiarize themself with the usage of components through the practice of basic chain circuit that is commonly-used in automatic control and pressure witches.
 

7. Forward / reverse rotation control circuit of three-phase induction motor, automatic forward / reverse rotation cycle control circuit

-  With the practice of motor control circuit, students become skilled in motor usage and each electric component ; moreover,users can utilize this equipment to verify their own designed circuit.