KE2 Temp+Valve Control Installation Manual

What's in the Kit - Parts List

The following are included in the KE2 Temp + Valve kit, pn 21301:

• (1) KE2 Temp+ Valve controller (pn21393 - controller only)
• (1) 10' pressure transducer
• (1) temperature sensor - 45"
• (1) temperature sensor - 10'
• (4) self-tapping mounting screws
• (1) sensor zip tie
• (1) screwdriver
• (2) screws for high voltage shield

Supplies List

Standard truck stock items are required to install the controller. A list is provided below:

• Conduit to go between the controller and the evaporator.
• (2) Conduit connectors (straight or elbow as required).
• (4) High voltage wires matched to the load of the liquid line solenoid/compressor and the controller.
• Wire labeling (numbers, colors, etc.).
• Additional wire ties.
• 18 gauge twisted shielded pair (if extending sensor wires/adding communication).
• Foam insulation (if running wires outside the space).
• Silicone (for sealing any box penetrations).

Select Mounting Location

The KE2 Temp + Valve is designed for a wide range of applications, with many potential installation locations. Breaking down the installation location, by application, provides the most helpful reference.

Visuals: Images depict typical mounting locations for Walk-in, Under Counter, Wine Cabinet, and Commercial applications.

Remote Monitoring, Control, Alarm Notifications

The Temp + Valve includes RS-485 Modbus communications, and can now be accessed remotely using the KE2 Edge Manager (KE2-EM). See page 4 for additional details.

Service Call Saver - Post Defrost Indicator

To eliminate unnecessary service calls, the KE2 Temp + Valve alerts the user when it is coming out of a defrost cycle using the onboard display. The display alternates between dEF and the actual temperature measured by the air sensor. This continues until the temperature has reached setpoint, or for the amount of time set by dFt (Defrost Time), whichever is shorter.

Wiring the Controller

The Temp + Valve was designed with functionality in mind. The controller accepts 120V / 208-240V to power the controller through the lower conduit connection. The temperature sensor, pressure transducer, valve, and communication wires are attached via the upper conduit connector.

1. When wiring the controller, first remove the display by loosening the four corner screws. The display is connected to the lower board by a short ribbon cable. Caution: The board may be damaged if excessive force is used when removing the cover.
2. After the four screws have been detached from the lower section, the cover may be gently moved to the side.
3. Next, remove the high voltage protective cover. There are two screws holding it in place.
4. With the high voltage cover removed, the two screw terminal connectors can be seen. The Red 2-position connector is the controller's power supply.
5. Connect line (L1) 1 to the rightmost terminal position and neutral (L2) 2 to the terminal position.
6. The liquid line solenoid-compressor contactor relay accepts a variety of input voltages and is not required to match the controller's input. See the table for relay ratings. The relay uses the 3-position screw terminal to make the connection on the board. It may control either the liquid line solenoid or as a pilot to the compressor contactor. When connecting the wires to the relay, the controller will be breaking one leg of the power.
7. If the solenoid will use the same voltage as the controller, one leg of incoming power (L1) 5 should be connected to the common terminal of the liquid line solenoid relay (the leftmost terminal connection). The other leg of the incoming power (L2) should be connected directly to the solenoid lead. The remaining lead from the solenoid should be connected to the NO (normally open) 3 terminal (the center terminal location).
8. Proper wiring practices must be followed. Local wiring codes take precedence over any information in this bulletin.
9. Replace high voltage shield after wiring is completed.

Relay Rating

Low Voltage Connections

Air Temperature Sensor

The air temperature sensor terminal is located on the cover's circuit board and is permanently attached. The temperature sensor input consists of the right two terminal positions. The sensor is not polarized and may be connected in either orientation. The sensor should be fed through the top conduit connection before being attached to the board. This terminal is also used for an External System Off signal in certain control modes. (See diagrams for more detailed information.)

Suction Temperature Sensor

The suction temperature sensor terminal is located on the cover's circuit board and is permanently attached. The temperature sensor input consists of the middle two terminal positions. The sensor is not polarized and may be connected in either orientation. The suction temperature sensor is required when applying the controller with an electronic expansion valve. The sensor's proximity to the evaporator outlet differs slightly for electronically controlled valves from the placement of a TEV bulb. Due to the more refined control from an electronically controlled valve, the sensor must be placed as close to the outlet of the coil as feasible. Although the distance from the outlet is different, the nature of the refrigerant's flow through the tube remains unchanged, thus the orientation of the sensor remains at the 4 or 8 o'clock position. The sensor should be secured to the suction line using the included wire ties designed for low ambient operation. Only zip tie the sensor bulb; DO NOT zip tie the sensor cable. This terminal is also used for an External System Off signal in certain control modes. (See diagrams for more detailed information.)

Pressure Transducer

The pressure transducer terminal is located on the cover's circuit board and is permanently attached. The pressure transducer input consists of the 3 terminal positions on the left-hand side of the board. When replacing a mechanical expansion valve, the external equalizer can be repurposed for the pressure transducer. Cut and braze a 1/4" male SAE fitting with schrader valve to the external equalizer. The pressure transducer can alternatively be attached to the suction service port on the evaporator's suction header. If a suction port is not available, mount the pressure tap on the top of a horizontal section of tube, approx. 3 inches downstream of the suction temperature sensor.

Visuals: Diagrams show terminal connections for Air Temperature Sensor (TEMP 1, TEMP 2), Suction Temperature Sensor (TEMP 2, TEMP 3), and Pressure Transducer (3 terminals on the left). Also shows RS-485 communication terminals.

Accessing the KE2 Temp + Valve on a Local Area Network

When the KE2 Temp + Valve is connected to the KE2-EM communication device's serial terminal, the device will find the controller and provide immediate local network communication. More information on the KE2-EM is found in bulletin Q.5.62.

Accessing the KE2 Temp + Valve on the Internet

When used with the KE2-EM, the KE2 Temp + Valve can be accessed remotely through the KE2 Smart Access portal, anywhere Internet service is available. This allows monitoring and setup of alarm alerts (email/text) for system issues, even during holidays or vacations. More information on KE2 Smart Access is found in bulletin Q.1.34 and A.1.76.

Visual: Network diagram illustrating connection from existing network (wired or Wi-Fi) via KE2 Switch to KE2-EM, then to KE2 Wireless Sensors, and finally to WiFi-enabled devices (Smartphone, Tablet, Laptop) for service. Also shows KE2 Therm Ethernet and Modbus Controllers.

Webpage View

From the Webpage, users can monitor temperatures, relay status, and alarms, as well as make changes to setpoints and manually control the system.

Visual: Screenshot of the KE2 Temp + Valve webpage interface showing System State, Alarms, Setpoints, Device Info, and Manual Control options.

Programming the Controller

The controller's preset defrosts per day can be adjusted, automatically spacing defrosts based on the number of defrost cycles selected (0-12). Individual defrosts can also be scheduled for specific times.

KE2 Temp + Valve Control Basic Navigation

Understanding the KE2 Temp + Valve Defrost's menu structure simplifies configuration. Figure 1 shows basic button functions and a list of basic setpoints. A brief description of abbreviations is found on pages 15-16.

Figure 1:

Visual: Image of the KE2 Temp+Valve controller display showing "35.7" and "Hold for manual defrost".

Indicator lights:

• Red light: Critical alarm (system is NOT running)
• Yellow light: Non-critical alarm (system running)
• Green light: Calling for refrigeration, liquid Line Solenoid (LLS)/compressor contactor relay energized.
• Green blinking: Waiting on short cycle timer to energize/de-energize LLS/comp. contactor relay.

Accessing Setpoints:

• Press and hold the ENTER button until 'CtL' (control type) displays.
• Use the ↑ arrow to advance through available setpoints.
• Press ENTER to view the current setting.
• Use the ↑ and ↓ arrows to change the setpoint.
• Press ENTER to move between digits to accelerate changes.
• Press ENTER and hold to confirm each setpoint change.
• Press BACK to escape.

Accessing the Menus

Visuals: Diagrams illustrate the navigation paths for ADVANCED MENUS and BASIC MENUS, showing button presses (BACK, ENTER, hold for 3 seconds) and setpoint selections (CtL, SHt, SH, HGb, SUb, etc.).

Variables Menu

Alarm List

Basic Menu: "Out of Box" or if Superheat (SHt)

*Selecting fewer than 5 compressor starts per hour results in the starts per hour feature being turned off. The compressor will then function on temperature only.
** Selecting CUS (custom) unlocks additional Setpoints.
*** Last zero is truncated on the display.

Advanced Menu: "Out of Box" or if Superheat (SHt)

Basic Menu: EEV Control Only - No Thermostat (SH)

* Selecting fewer than 5 compressor starts per hour results in the starts per hour feature being turned off. The compressor will then function on temperature only.
** Selecting CUS (custom) unlocks additional Setpoints.
*** Last zero is truncated on the display.

Advanced Menu: EEV Control Only - No Thermostat (SH)

Basic Menu: Hot Gas Bypass (HGb) or EEPRV (EPr)

Advanced Menu: Hot Gas Bypass (HGb) or EEPRV (EPr)

Basic Menu: Subcool (SUb)

** Selecting CUS (custom) unlocks additional Setpoints.
*** Last zero is truncated on the display.

Advanced Menu: Subcool (SUb)

Abbreviations - Alphabetical Listing

Visuals: Diagrams show various control types including Superheat and Temperature w. Air Defrost, Superheat Only, Hot Gas Bypass: Temperature Control, Hot Gas Bypass: Pressure for Capacity Control, Electronic Evaporator Pressure Regulator: Discharge or Return Air Temperature, and Electronic Evaporator Pressure Regulator: Pressure Control. These diagrams illustrate wiring connections and system configurations.

Visuals: Diagrams show Multi-Evaporator Setups with Master and Slave controllers configured for Superheat & Temperature (SHt) and Superheat (SH). Also shows a Subcool control setup. These diagrams illustrate controller interconnections and system flow.

Visuals: Wiring Diagram shows overall connections including Air Temp Sensor, Suction Sensor, Suction Pressure Transducer, EEV, Transformer, Relay, LLS/Compressor Contactor, and Modbus. Dimensions in inches are provided for the controller unit. An Alternate Wiring Method is also shown.

Custom Defrost Setup

The following steps guide the setup of the KE2 Temp's custom defrost feature. Note: The KE2 Temp + Valve Control does not have an on-board battery backup. If power is lost, the defrost schedule may be offset by the duration of the power outage.

Abbreviations: CUS = custom, d1 = custom defrost 1, diS = disabled, dPd = defrosts per day, tS = temperature setpoint, tOd = time of day.

1. STEP 1: Press and hold the ENTER button; 'tS' is displayed on the LEDs.
2. STEP 2: Press the ↑ arrow until 'dPd' is displayed, then press ENTER. '6' (default) will be displayed.
3. STEP 3: Press the ↑ arrow until 'CUS' is displayed. Press and hold the ENTER button for 3 seconds until 'dPd' is displayed.
4. STEP 4: Press the ↑ arrow until 'tOd' (time of day) is displayed, then press ENTER. Use the ↑ and ↓ arrows to set the time. Note: Time is displayed in military format (24-hr clock). The first 2 digits are the hour; minutes are after the decimal. The time is set to the nearest 10 minutes (e.g., 8:10 am is 8.1, 4:32 p.m. is 16.3). After setting the time, press and hold ENTER for 3 seconds until 'tOd' is displayed.
5. STEP 5: Press the ↑ arrow to display Defrost 1 ('d1'). To set the first defrost, press ENTER. 'diS' (disabled) will be displayed. Use the ↓ arrow to set the defrost time (on the hour). Once the correct time is displayed, press and hold ENTER until 'd1' is displayed.
6. STEP 6: Repeat steps as necessary for d2 to d12.
7. STEP 7: Press the BACK button to save settings and return to the main screen (room temp will be displayed).

CONTROL TYPE: Superheat and Temperature w. Air Defrost

Diagrams illustrate the step-by-step configuration for this control type, showing connections for Control Type, Superheat & Temperature, Input, Pressure/Temperature, and wiring for the LLS/Comp. Contactor Relay. Communication via Modbus to a Building Management System (BMS) or KE2-EM is also described.

CONTROL TYPE: Superheat Only

Diagrams illustrate the step-by-step configuration for this control type, showing connections for Control Type, Superheat, Input, Pressure/Temperature. It notes that the KE2 Temp + Valve should be supplied with a signal from a 3rd party to close the valve when function is not desired. Communication via Modbus is also described.

CONTROL TYPE: Hot Gas Bypass: Temperature Control

Diagrams illustrate the step-by-step configuration for this control type, showing connections for Control Type, Hot Gas Bypass, Input, and Temperature. It notes that the KE2 Temp + Valve should be supplied with a signal from a 3rd party to close the valve when function is not desired. Communication via Modbus is also described.

CONTROL TYPE: Hot Gas Bypass: Pressure for Capacity Control

Diagrams illustrate the step-by-step configuration for this control type, showing connections for Control Type, Hot Gas Bypass, Input, and Pressure. It notes that the KE2 Temp + Valve should be supplied with a signal from a 3rd party to close the valve when function is not desired. Communication via Modbus is also described.

CONTROL TYPE: Electronic Evaporator Pressure Regulator: Discharge or Return Air Temperature

Diagrams illustrate the step-by-step configuration for this control type for CASES and WALK-INS, showing connections for Control Type, Evaporator Pressure Regulating, Input, and Temperature. It notes that the KE2 Temp + Valve should be supplied with a signal from a 3rd party to close the valve when function is not desired. Communication via Modbus is also described.

CONTROL TYPE: Electronic Evaporator Pressure Regulator: Pressure Control

Diagrams illustrate the step-by-step configuration for this control type, showing connections for Control Type, Evaporator Pressure Regulating, Input, and Pressure. It notes that the KE2 Temp + Valve should be supplied with a signal from a 3rd party to close the valve when function is not desired. Communication via Modbus is also described.

MULTI-EVAPORATOR SETUP

Master: Controller 1 - Superheat & Temperature (SHt)

Diagram shows a Master controller (SHt) with connections for Control Type, Superheat & Temperature, Pressure Transducer, Suction Temperature, Air Temperature, and Return Air Temperature. It also shows Slave controllers (SH) for Evaporator 2 and Evaporator 3, with their respective connections. Wiring for LLS (Liquid Line Solenoid) or COMP CONTACTOR is also depicted.

Control Type: Subcool

Diagram shows the Subcool control setup with connections for Control Type, Pressure Transducer, Suction Temperature, Liquid Leaving Temp, and Warm Liquid/Subcooled Liquid flow through a Subcooling Heat Exchanger. Wiring for LLS and EEV is also shown. A note indicates that shorting the suction temperature sensor input will cause the controller to go to System Off mode (SOF) and close the LLS and EEV.

Wiring Diagram

The wiring diagram provides a comprehensive overview of the controller's connections. It includes:

• Sensors: Air Temp Sensor, Leaving Liquid Temp (Subcooling Control), Suction Sensor, Suction Pressure Transducer.
• Controller Terminals: Ribbon Cable connection, PWR CB, ModBus terminals (CN2, CN7, CN3), EEV connection, Transformer, Relay terminals (COM, NC, NO, L2, L1), LLS (Liquid Line Solenoid) or COMPRESSOR CONTACTOR connection.
• Dimensions: Top View and End View dimensions (in inches) of the controller unit are provided.
• Alternate Wiring Method: An alternative wiring configuration is shown for EEV, LLS Power Supply, and COMP Neutral.
• Power Supply: 120 (208-240)/1/60 CONTROLLER POWER SUPPLY is indicated.