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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.

2.

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  pairs  of  pins  if  needed  to  confirm  if  the  controller  is  functioning  properly  or  not.    If  the
momentary  DC  voltage  jump  is  detected  with  the  meter  following  the  preceding  steps,  the
controller is working properly.  Proceed to troubleshoot the wire harness and the EXV.

8. If no voltage is detected at any point in time after following steps 3 thru 6, replace the controller

board.

Содержание HTPG EcoNet Series

Страница 1: ...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 HTPG EN TG0821...

Страница 2: ...via display under Status Outputs Aux Relay 1 Aux Relay 2 Relay operation for fan speed control is as follows Aux Relay 1 ON Full Speed Aux Relays 1 2 ON Half Speed Aux Relays 1 2 OFF Fans off If dama...

Страница 3: ...g properly proceed to verify defrost cycle duration on the controller display go to Status Defrost Last Defr Time Also force a defrost and wait for it to finish to take note of the duration Low Profil...

Страница 4: ...Settings System Enable and verify that all the controllers in the group are set to YES Verify software version at each controller on the display by navigating to Service So ware Version Every control...

Страница 5: ...ment Network Instance 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 con...

Страница 6: ...art 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 harnes...

Страница 7: ...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 a...

Страница 8: ...L MNOL J PI QJ L S NT UV L MI W X YV Y PI QJ L Z L MN NT _ I L aL X I b L c d e g h i j k lV YQL T Nm n L o MI W X YV Y p L T I J S L YoL T I V T L qV T X p I J J rstu v rstu w rstu x y z u y u z e y...

Страница 9: ...6 5 0 8 6 6 4 8 9 0 70 2 5 6 6 8 8 9 76 8 6 5 0 8 6 8 9 5 6 5 6 6 5 6 6 8 6 5 6 8 9 MN 8 8 9 5 0 8 8 6 I O O 0 8 6 8 9 P Q R 5 8 6 N4 85 0 5 6 S70 8 2 T 6 8 9 5 5 9 6 4 2 58 5 0 8 0 0 9 8 6 5 P 5 0 8...

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