With the TU-9240 HVAC Electrical Control Training Unit, students have the opportunity to learn the basics of electricity and control circuit setup. This unit is built on a rolling frame and has 36 modular HVAC electrical controls training unit panels (see below).
| PART NUMBER
|
IMAGE
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DESCRIPTION
All panels are powered by 24-volt except the #3009100 Transformer Panel. |
ELECTRICAL (DW = Direct Wiring via Terminal Blocks. PNP = Plug and Play via Banana Jacks) |
| 3009100 |  |
Transformer Panel: Power panel for the unit. 120V supply to the transformer, reducing the voltage to 24 volts. Fused on low voltage side for 5 amps and the high voltage side for 6 amps. Gives user the choice of using direct wiring or plug and play. Also gives a diagram of the transformer, as found on an electrical or engineering print. | DW OR PNP |
| 3009101 |  |
ETC Control Panel: (Electronic Temperature Control): 2-stage temperature controller, could be used for heating or cooling applications. Thermistor type temperature sensor. | DW |
| 3009102 |  |
Time Delay Panel: This shows a delay scenario, useful for demonstrating a delay in time for starting a load. Normally used in refrigeration systems to prevent short-cycling a compressor.
|
PNP |
| 3009103 (2) |  |
DPDT Relay Panel (double-pole, double-throw relay). This is a common relay found in an electrical control system, with a normally open and normally closed set of contacts. Commonly known as a “switching relay.” Gives the user two different control points. (2 of these identical panels are provided in the TU-9240.) | DW |
| 3009104 |  |
Liquid Line Solenoid Panel: Shut-off device in the liquid refrigerant side of an HVAC unit. Commonly used for refrigerant pump-down. A solenoid powered by a 24-volt coil. | DW |
| 3009105 |  |
Low Pressure Commercial Panel: This commercial low-pressure control is used extensively on refrigeration systems, for the primary function as a safety control and system pump down. This is an adjustable control. Also has a fault switch on the back side (verify) to open up the circuit to simulate a problem such as a low-pressure situation in the system.
|
DW |
| 3009106 |  |
Low Pressure Residential Panel: This is an in-line low pressure control, commonly used in residential refrigeration systems as well as commercial. It has a fault switch on the back side to open up the circuit to simulate a problem such as a low-pressure situation in the system.
|
PNP |
| 3009107 |  |
Stop-Start Panel: This application is seen most often in a commercial system, and functions well with holding circuits. For example, in a situation requiring a pump-down. Has a set of normally open and normally closed contacts, as can be seen on the schematic.
|
DW |
| 3009108 |  |
3-Pole Contactor w/Aux Panel: This demonstrates a motor starting device. (It differs from a relay, which is used to transfer control power.) With a 24-volt coil, it has 3 legs on the contactor, shown as L1, L2 and L3, and a set of auxiliary contacts. In addition to the motor start, the user can do other functions with the contactor, such as start a fan, etc. | DW |
| 3009109 |  |
High Pressure Commercial Panel: This commercial high-pressure mechanical pressure switch will open when a rise in pressure exceeds the control setting, as a safety control. It has a fault switch on the back side to open the circuit and simulate a high-pressure situation in the system.
|
DW |
| 3009110 |  |
Thermostat, Non-Programmable Panel: This is a low-voltage, non-programmable digital thermostat, which is very common in residential and some commercial applications. Used for heating/cooling application.
(Y = Yellow = Cooling Mode) (W = White = Heating Mode). A fault switch on the back side opens up the cooling circuit. |
PNP |
| 3009111 |  |
3-Pole Contactor with Overload Panel: This 3-pole contactor has auxiliary contacts and overload protection. Its purpose is to show the function of an overload circuit. The light bulb panels are used as a load to trip the overload circuit. Refer to the manual on Page 20.
|
DW |
| 3009112 |  |
Thermostat, Programmable Panel: Programmable 24-volt, single stage thermostat. Allows the student to experience programming thermostat operations.
Red = power; green = fan operation; white = heating; yellow = cooling, c = common.
|
DW |
| 3009113 |  |
High Pressure Residential Panel: an in-line high-pressure control, used in residential or commercial applications. Designed as a safety control, this will open the circuit on a rise in pressure, commonly found in the starting circuit.
|
PNP |
| 3009114 |  |
Mechanical Temperature Control Panel: Commonly used in refrigeration systems. Can be used for either heating or cooling applications. It has a remote-sensing bulb that can be used in air applications or submerged in water. | DW |
| 3009115 |  |
Load Panel: This panel was built to be used in conjunction with relays to show different switching applications. LED lamps indicate a load in a circuit. | DW or PNP |
| 3009116 |  |
Switch Panel: This series of single-pole, single-throw switches can be individually used to supply power or to open a circuit when necessary. Used for various scenarios in the wiring schematics in the manual. | DW or PNP |
| 3009117 |  |
Compressor Panel: this simulates the starting of a compressor, common in residential and commercial applications. It has two LEDs to simulate the start (yellow) and run (green) of the compressor. | DW or PNP |
| 3009118 |  |
Time Delay, Off, Panel: This unit delays the off cycle in a number of residential and commercial heating and cooling applications which are remotely started by an auxiliary device. This unit has an adjustable time span from 1 to 10 minutes. | DW |
| 3009119 |  |
Single Power Contactor Panel: Commonly used for motor starting applications such as compressor or fan operation. It has one set of normally open contacts, with a common bar, and 24-volt coil application. It has a fault switch located on the back of the panel to simulate contact failure.
|
PNP |
| 3009120 |  |
SPDT Relay Panel (Single Pole Double Throw) Commonly known as a switching relay, this is used to transfer voltage to another element in the system. | PNP |
| 3009121 |  |
Magnetic Line Relay Panel: This is an enclosed relay used for light loads such as starting a fan, starting a contactor, or other small loads in the circuit. Has both normally open and normally closed contacts. This panel is 24-volt with a LED indicator lamp showing that the relay in energized.
|
PNP |
| 3009122 |  |
Indoor Fan Panel: (2 of these identical panels are provided in the TU-9240.)
These simulate the indoor system operation of the air handler function. |
DW or PNP |
| 3009123 |  |
Outdoor Fan Panel: (2 of these identical panels are provided in the TU-9240.)
These simulate the outdoor system operation of the condensing unit. |
DW or PNP |
| 3009124 |  |
Lamp Socket/ Load Panel: (4 of these identical panels are provided in the TU-9240.) Designed for basic electricity understanding of series and parallel circuits, voltage, resistance, and amperage parameters. More than one of these panels can be used in creating a circuit in conjunction with other features, and can also can be used for loads in other circuits. | PNP |
| 3009125 |  |
SPST Switch 1-way Panel: (Single pole single throw). This is used to teach the principles of basic wiring and technique, used in conjunction with lamp bases. | PNP |
| 3009126 (2) |  |
SPDT Switch, 3-way Panel: (Single Pole, Double Throw) This can be combined with other switches, to demonstrate transferring power used with the lamp bases, and show control from different locations, or can be combined into one circuit. (2 of these identical panels are provided in the TU-9240.) | PNP |
| 3009127 |  |
DPDT Switch, 4-way Panel (Double Pole, Double Throw) This can be combined with other switches, to demonstrate transferring power used with the lamp bases, and show control from different locations, or can be combined into one circuit. | PNP |
| 3009128 |  |
Time Delay, On Panel: Time Delay, On, Panel: This unit delays the on cycle in a number of residential and commercial heating and cooling applications. This unit has an adjustable time span from 1 to 10 minutes. | DW |
As a companion unit to the TU-9240, the TU-9250 HVAC Controls Training System is a companion unit that demonstrates the complete cycle of a residential cooling and heating system. See the 12 modular HVAC electrical controls training unit panels below.
| PART NUMBER
|
IMAGE
|
DESCRIPTION
|
ELECTRICAL (DW = Direct Wiring via Terminal Blocks. PNP = Plug and Play via Banana Jacks) |
| 3009106 |  |
Low Pressure Residential Panel: This is an in-line low pressure control, commonly used in residential refrigeration systems as well as commercial. It has a fault switch on the back side to open up the circuit to simulate a problem such as a low-pressure situation in the system.
|
PNP |
| 3009112 |  |
Thermostat, Programmable Panel: Programmable 24-volt, single stage thermostat. Allows the student to experience programming thermostat operations.
Red = Power Green = Fan Operation White = Heating Yellow = Cooling C = Common |
DW |
| 3009113 |  |
High Pressure Residential Panel: An in-line high-pressure control, used in residential or commercial applications. Designed as a safety control, this will open the circuit on a rise in pressure, commonly found in the starting circuit. It has a fault switch on the back side for simulations.
|
PNP |
| 3009117 |  |
Compressor Panel: This simulates the starting of a compressor, common in residential and commercial applications. It has two LEDs to simulate the start (yellow) and run (green) of the compressor. | DW or PNP |
| 3009119 |  |
Single Pole Contactor Panel: Commonly used for motor starting applications such as compressor or fan operation. It has one set of normally open contacts, with a common bar, and 24-volt coil application. It has a fault switch located on the back of the panel to simulate contact failure. | PNP |
| 3009129 |  |
Outdoor System Fan Panel: This 120VAC panel simulates the outdoor system operation of a condensing unit.
|
DW or PNP |
| 3009130 |  |
Combustion Blower Panel: This 2-stage blower operation demonstrates airflow to the burner section of a furnace. 120VAC.
|
Wire Harness Connections |
| 3009131 |  |
Control Module Panel: This unit is common for furnace applications. Once power is applied to the board, it will start the combustion blower motor, which will activate the pressure switch, so that the panel will get the “go signal” to continue the burner starting sequence. | DW |
| 3009132 |  |
Control Power Panel: This demonstrates how power is supplied to both furnace and air conditioning systems. Includes a fused surface switch, a 24-volt transformer, and is direct wired to both 120VAC and 24VAC control systems.
|
DW |
| 3009133 |  |
Indoor System Fan Panel: This 120VAC panel simulates the indoor system operation of the air handler function.
|
DW or PNP |
| 3009134 |  |
High/Low Pressure Safety Switch Panel: This is used in the safety circuit of a furnace operation, to sense pressure created from the combustion blower through a pitot tube. When it fails to register pressure, the system will neither start, nor continue running. | DW |
| 3009135 (Panel)
3009136 (Burner Assembly) |
 |
Combination Gas Valve Panel and Burner: This 2-stage gas valve receives a signal from the Control Board. Once there is a call for heating, the igniter is started, supplying gas to the burner for ignition. It includes a Burner Assembly with cage and regulator. Safety Note: the regulator provided has 3 pressure settings; it is recommended to operate only on low pressure in this application. The recommended 14.1-oz. propane tank can be purchased by user at any local hardware supply. | DW |
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