Summary of Contents for Rheem HTPG EcoNet Series
- Page 1 HTPG-EN-TG0821 Unit Coolers Troubleshooting Guide 3885 Crestwood Pkwy., Ste. 500 • Duluth, Georgia 30096 www.htpg.com • Phone: 800-288-9488, 256-259-7400 • Fax: 256-259-7478 A member of the Rheem family of brands...
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Page 2: Troubleshooting Guide
EcoNet Evaporator Controller Troubleshooting Guide July 30, 2021 Problem Possible Cause Remedy Ensure voltage selector switch is set to the proper setting (115V or 230V) and power harness is connected to controller board. No power to controller Use a voltmeter to verify that proper voltage is present on terminal board (L1, L2) on evaporator. EcoNet Controller does not turn on. Inspect controller board for visual signs of damage (discoloration, burn marks, broken components, etc.). If damaged, replace Controller board could be damaged. controller board. Make sure that new controller board has voltage selector switch to correct setting (115V or 230V) before applying power to the unit. Controller turns on but display is missing Controller board display is damaged. Replace controller board. lines or blank. Ensure voltage selector switch is set to the proper setting (115V or 230V) and power harness is connected to controller board. No power to controller. Ensure power is connected to terminal board (L1, L2, GND) on evaporator. Verify fan wiring diagram on unit and ensure that fans are wired to controller: WHITE wire to L2, BLACK wire to Aux Relay 1 on controller board, RED wire to Aux Relay 2 on controller board. Verify wires from Aux Relays 1 and 2 are connected to L1 on terminal board. Verify each of the EC fan motors has all the wires connected (WHITE, BLACK & RED). Verify Aux Relay status: One or more fans are not running. One or more fan wires are disconnected. when Aux 1 Relay is ON, fans run at full speed; when Aux 1 and Aux 2 Relays are both ON, fans run at half speed. LED will turn ON next to each relay on controller board to indicate relay is active. User can also verify Aux Relay 1 and 2 status via display under Status →Outputs→Aux Relay #1/Aux Relay #2 . Fan motor could be damaged. Replace fan motor. Fan blades could be obstructed. Verify fan blades and fan guards are free of obstruction. EcoNet controller could be manually disabled; System Enabled is set to NO in the controller On controller display, go to Settings →System Enabled and ensure it is set to YES. settings. - Page 3 Problem Possible Cause Remedy Door is open. Close door to the box. Make sure door remains closed unless/until access to box is needed. Verify at controller display the current superheat and valve position; go to Status →Superheat/EXV Current Pos. If superheat is System could be undercharged/leak present in the consistently high and valve is consistently running at or close to 100%, the system could be low on refrigerant. Verify if sight Unit is cooling but Space Temp never system. glass at condensing unit is clear. Verify suction pressure with a set of gauges. Recharge system as needed, verify if any leaks are reaches setpoint. present and fix as needed. Compressor could be shutting down Verify at condensing unit if compressor is shutting down intermittently. Troubleshoot condensing unit and verify if high head intermittently. pressure, phase loss, etc. Verify under the controller settings that the correct refrigerant is selected. On the display, go to Verify that the correct refrigerant is selected. Settings →Equipment→Refrigerant . An incorrect refrigerant setting will cause incorrect superheat calculation and the system will not operate properly. Verify if Suction Temp Thermistor alarm is active: on controller display go to Service →Current Alarms . Also verify Suction Temperature reading under Status→Sensors→Suc on Temp ; if it is reading "‐60 ⁰F", the sensor is not making good contact or is Suction Temp sensor disconnected (controller will missing. If Suction Temp sensor input is missing, the EXV will remain at a fixed position until sensor is replaced, and alarm alarm; red LED on controller will be blinking), or "A100 Suction Temp Thermistor Failure" will be active. If sensor is reading a value other than ‐60 ⁰F, verify that it is not an sensor could be malfunctioning/reading erratic erratic value and that the reading reasonably corresponds to the conditions at the evaporator (for example, if sensor is reading ...
- Page 4 Problem Possible Cause Remedy Evaporator Coil is steaming excessively Verify last defrost cycle duration under Status →Defrost→Last Defr. Time , and/or force a defrost manually and time it to verify during a defrost; water droplets duration. Low Profile and Center Mount evaporators should not defrost for longer than 30‐35 minutes. Adjust Defrost Defrost cycle is running too long. accumulating on the ceiling (Low Profile Termination Temperature (Def. Term. Temp ) down as needed, and also adjust the Maximum Defrost Time ( Def. Max Run and Center Mount FREEZER units). Time ) down from the 60 minute default setting if needed. The Drain Temp sensor may be used on Low Profile Freezers as an additional early warning that ice is building up on the drain pan. To enable this function set Drain Sensor? to YES on Settings →Equipment , and make sure that a Drain Temp Sensor (part EcoNet Controller generates alarm "A002 no. 08219623) is connected to the controller (DRAIN) and secured to the drain pan (carefully securing the sensor wire from There may be ice on the drain pan after a defrost Drain Temp < Defrost Termination touching the heaters). When a defrost cycle ends, if the Drain Temp does not reach Termination Temp, the controller will cycle ended; drain line could be blocked. Temp." (Low Profile FREEZER only). generate the "Drain Temp < Defrost Termination Temp." alarm. Verify that the drain pan heater is connected and working properly, and/or that the sensor is properly placed flat on the drain pan secured with the same nut that is holding the heater bracket. Verify that drain line is free of obstruction and heat tape is working properly to keep the line warm. EcoNet Controller generates alarm " A104 Drain Temp Sensor configured to YES under If no Drain Temp sensor is installed, make sure Drain Temp sensor is configured to NO under Settings →Equipment→Drain Drain Temp Thermistor Failure "...
- Page 5 Problem Possible Cause Remedy Make sure that communication wires from E1 and E2 terminals at the Command Center mounting bracket are securely connected at the E1 and E2 terminals respectively on the first controller board in the daisy chain. Make sure all controllers on Make sure that communication wires between the daisy chain network are powered on and properly addressed so the Command Center can find them. For Group Leaders and Command Center Display turns on but is Command Center Display and EcoNet controller Followers, the address is set at each controller under Settings →Equipment→Group‐Member Cfg. For standalone units on the not communicating with any controllers. are properly connected. daisy chain, the address is set at each controller under Settings→Equipment→Network Instance . Make sure that at least 22 gauge, shielded wire is used. Please refer to the EcoNet Installation Manual for how to daisy chain multiple controllers together with a Command Center Display. Some Evaporator Controllers in the network bus Make sure that every evaporator controller in the daisy chain network is powered on. may not be powered on. Make sure all controllers on the daisy chain network are powered on and properly addressed so the Command Center can find them. Every EcoNet board on the daisy chain must have a unique address set. For Group Leaders and Followers, the address is Possible conflict of addresses on the network. set at each controller under Settings →Equipment→Group‐Member Cfg. For standalone units on the daisy chain, the address is set at each controller under Settings→Equipment→Network Instance . Command Center Display turns on and is able to communicate with some controllers, but not with others on the Make sure that communication wires from E1 and E2 terminals at the Command Center mounting bracket are securely daisy chain network. connected at the E1 and E2 terminals respectively on the first controller board in the daisy chain. Make sure that the communication wire is securely connected to the E1, E2 and RT terminals between every controller board, and that the wires Make sure that communication wires between are not crossed from terminal to terminal. Make sure that at least 22 gauge, shielded wire is used. Make sure that the Command Center Display and EcoNet controller ...
- Page 6 6/23/2021 Addendum A Verifying EcoNet Controller EXV Operation (Sporlan SER Valve) 1. On the controller display, navigate to Settings→Equipment→EXV Stepper Type and verify that it is set to 2500 steps, corresponding to Sporlan SER valves. 2. Connect a set of gauges on the suction line to verify suction pressure. 3. If the system is running (no defrost active), go to Settings→System Enable and set it to No. This will cause the controller to command the EXV to close and pump down the system. If standing close enough to the evaporator, listen for the characteristic noise of the EXV as it is closing. The noise/vibration from the valve is confirmation that the controller is applying current to the stepper motor in the valve. If the valve is confirmed to make noise, go to Step 5. If driving the valve again is needed to confirm valve noise, set System Enable back to Yes and wait the two‐ minute minimum OFF time to finish so the controller can command the valve to open (open the freezer door if needed to warm the box slightly). After confirming the controller is attempting to open the valve, set System Enable back to No to force the valve to close again. (Alternatively, disconnecting and re‐connecting power to the controller will cause it to drive the valve closed as part of initial startup of the controller.) 4. If the valve does not make any noise: a. Verify connection to the valve is secure, and that the 4 pins on the valve are not bent. b. Verify that the wiring harness is not damaged, or that any pins have not come loose from the connector on the control board. c.
- Page 7 6/23/2021 Verifying Controller Signal to EXV 1. If the system is running (no defrost active), go to Settings→System Enable and set it to No to force a pump down. Disconnect power to the condensing unit, and the evaporator. With no power applied to the evaporator terminal block, safely disconnect the wire harness connector from the controller to expose the 4 pins that connect to the EXV cable, as shown in the picture below. 3. Reconnect power to the evaporator only to turn the controller back on. 4. Using a voltmeter, place the test leads between pins 1 & 3, and pins 2 & 4 as shown in the pictures below. Set the meter to measure DC volts. 5. On the controller display, set System Enable back to Yes and wait 1 to 2 minutes for the controller to enable cooling (open freezer door if needed to warm up the box slightly so the controller can attempt to signal the valve open). 6. With the meter test leads touching pins 1 and 3, when the controller signals that the output to the valve reached the desired position (between 35% and 65%, visible via Status→EXV), the meter should read approximately 12 to 16 Volts DC for a few seconds, then read approx. zero volts. Set System Enable back to No to have the controller send the signal to close. Again, with the meter test leads touching pins 1 and 3, watch the voltmeter for the momentary bump in DC volts (12 to 16 VDC) when the signal to the valve reaches its final position (0%, visible via Status→EXV ) then back to near zero volts. 7. Repeat Step 5 again with meter leads touching pins 2 and 4. Repeat the test several times with both ...
- Page 8 Courtesy of Sporlan Division – Parker Hannifin Corporation...
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