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AAON V12100 MHGRV-X, Field Technical Manual

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MHGRV-X Field Technical Guide

 

                          

INPUTS & OUTPUTS

7

Inputs and Outputs

Table 1:  MHGRV-X Controller Inputs & Outputs 

NOTE:

  

All analog and 24 VAC contact closure inputs are used 
only in Stand Alone operation.

Analog Inputs

SAT:  Supply Air Temperature Sensor

Used in stand-alone operation and when MODGAS is connected 
to a CAV/VAV or MUA Controller. The Supply Air Temperature 
Sensor is the main control input. This sensor has to be installed for 
the unit to operate. The Supply Air Temperature Sensor is located 
in the discharge air stream and monitors the HVAC unit’s Supply 
Air Temperature to maintain the Supply Air Temperature Setpoint.

RST IN:  Reset Signal

Used  only  in  stand-alone  operation. The  Discharge Temperature 
Setpoint can be reset by supplying a 0-10 VDC signal to the RESET 
IN low voltage terminal block. This reset signal is optional and need 
only be used if you require resetting of the discharge air temperature.

AUX IN:  Auxiliary Reheat Valve Input

Used when AUX mode is confi gured as enabled. This input looks at 
a 0-10 VDC signal to control the valve position. 0VDC = 0% Reheat 
Valve position, 5VDC = 50% Reheat Valve position. 10VDC = 100% 
Reheat Valve position.

I/O Map

The following inputs and outputs are available on the MHGRV-X  
Controller. See 

Table 1

 below to reference the Input/Output Map. 

ANALOG INPUTS

1

Supply Temperature

2

Reset Signal

3

AUX Input

BINARY INPUTS

1

Reheat Enable

2

Heating Override

3

Cooling Override

RELAYS

1

Fan

2

Compressor

3

Reheat Valve / Compressor 2

4

Auxiliary / Reversing Valve

Binary Inputs

REHEAT EN:  Reheat Enable Contact

Used only in stand-alone operation. When a call for dehumidifi cation 
is initiated by another controller, this interlocked 24 VAC wet contact 
closure is used to enable the MHGRV-X controller.

HEAT OVR:  Heating Override

Used only in stand-alone operation. When a call for heating is initi-
ated by the HVAC unit, this interlocked 24 VAC wet contact closure 
is used to override the MHGRV-X controller dehumidifi cation mode.

COOL OVR:  Cooling Override

Used only in stand-alone operation. When a call for cooling is initi-
ated by the HVAC unit, this interlocked 24 VAC wet contact closure 
is used to override the MHGRV-X controller dehumidifi cation mode.

Relay Outputs

FAN:  Fan Enable

When  a  call  for  Dehumidifi cation,  Cooling  Override,  or  Heating 
Override is received, this relay will be closed to energize the HVAC 
unit Supply Fan.

CMP:  Compressor Enable

When a call for Dehumidifi cation or Cooling Override is received, 
this relay will be closed to energize the Compressor(s).

VALVE:  Reheat Solenoid Valve / Compressor 2

If confi gured as standard, this relay will be used to control a Reheat 
Solenoid Valve. When a call for Dehumidifi cation  is active for 30 sec-
onds, this relay will be closed to energize the Hot Gas Solenoid Valve. 

If confi gured as Compressor 2, this relay will be used to control 
a  second  Compressor  when  there  is  a  call  for  Dehumidifi cation. 
Compressor 2 will come on 30 seconds after the fi rst Compressor 
activates. Compressor 2 has a minimum run time of 10 minutes, 
and will turn off  if the Reheat Valve is at 100% and the Supply Air 
Temperature is 

5°F

 below setpoint for 1 minute. After being off  for 

10 minutes, it can come back on if the Supply Air Temperature is 

5°F

 above setpoint and the valve is at 0%.

AUX:  2 Position HGR Valve / Reversing Valve

If confi gured as standard, this relay will be used to control a 2 Position 
HGR Valve. Used on larger capacity systems that have an optional 
2 Position HGR Valve in addition to the Modulating HGR Valve.  
When a call for Dehumidifi cation is received, if the modulating HGR 
valve is at 100% and the Supply Air Temperature is at least 

5°F 

be-

low setpoint, this relay output will energize to enable the 2 Position 
HGR Valve. The relay will de-energize when the modulating HGR 
valve closes to 0% and the Supply Air Temperature is at least 

5°F 

above setpoint. The modulating valve is then enabled to modulate 
to maintain the Supply Air Temperature Setpoint. 

If confi gured as Reversing Valve, this relay will control a Reversing 
Valve on a Heat Pump unit. Any time there is a call for Cooling or 
Dehumidifi cation, this relay will be energized.

COM:  Relay Common

Requires 24 VAC from transformer.

Summary of Contents for V12100 MHGRV-X

Page 1: ...MHGRV X Controller Field Technical Guide Factory Packaged Controls ...

Page 2: ...onsiderations 4 MHGRV X Controller to AAON Unit Controller Wiring 5 MHGRV X Stand Alone Wiring 6 INPUTS AND OUTPUTS 7 OPERATION OVERVIEW 8 Initialization 8 Modulating Hot Gas Valves 8 Modes of Operation 8 Additional Features 9 LCD DISPLAY SCREENS 10 TROUBLESHOOTING 14 Using LEDs to Verify Operation 14 Temperature Sensor Testing 15 APPENDIX A Supply Air Temperature Sensor Guide 18 Supply Air Temper...

Page 3: ...nnection or an E BUS connection When using the MHGRV X Controller to replace an existing MHGRV II Controller see Appendix B page 20 for details See Figure 1 for dimensions in inches MHGRV X Controller General Information Figure 1 V12100 MHGRV X Controller Dimensions Features The MHGRV X provides the following Can be operated as a stand alone controller or communicating with AAON unit controllers P...

Page 4: ...all ground wires remain common Failure to follow this procedure can result in damage to the module and connected devices 5 All wiring is to be in accordance with local and national electrical codes and specifications 6 Check all wiring leads at the terminal block for tightness Be sure that wire strands do not stick out and touch adjacent terminals Confirm that all transducers required for your syste...

Page 5: ... E BUS Cable to connect to the appropriate E BUS port on those modules and or controller For all other controllers including the VAV CAV MUA VCM VCM X SA and RNE Controllers use an I2 C Cable connecting to the appropriate I2 C ports on those controllers When connected to an AAON Unit Controller the Supply Air Temperature Sensor is attached to the Main Controller See Figure 2 below See the SAT Wiri...

Page 6: ...HGRV X Controller Stand Alone Wiring Stand Alone Wiring In Stand Alone mode the MHGRV X connects to the E BUS port of the Reheat Expansion Module with an EBC E BUS cable See Figure 3 below See the SAT Wiring Conditions Table and SAT OPTIONS jumper settings in Tables 7 8 page 19 ...

Page 7: ...ling Override Used only in stand alone operation When a call for cooling is initi ated by the HVAC unit this interlocked 24 VAC wet contact closure is used to override the MHGRV X controller dehumidification mode Relay Outputs FAN Fan Enable When a call for Dehumidification Cooling Override or Heating Override is received this relay will be closed to energize the HVAC unit Supply Fan CMP Compressor ...

Page 8: ...essor In addition the controller will open the Hot Gas Reheat Coil by activating the VALVE output At this time the MHGRV X Controller will start to modulate the Modulating Hot Gas Reheat valve The control ler will modulate the MHGR valve to maintain the Supply Air Temperature Setpoint by activating the stepper motor outputs on the MHGR valve The Supply Air Setpoint is configured with the Setpoint S...

Page 9: ...heat Solenoid will be deactivated 2 minutes after the reheat de mand ceases The Hot Gas Reheat Solenoid valve will be reactivated when a request for reheat is received by the MHGRV X Controller Communicating Operation In this mode the MHGRV X Controller behaves as an expansion board for anAAON Unit controller The controller begins the dehu midification process when theAAON Unit controller makes a r...

Page 10: ...eys Figure 4 LCD Display and Navigation Keys Table 2 Navigation Key Functions Navigation Key Key Function MENU Use the MENU key to navigate through the Main Menu Screens UP Use this key to adjust setpoints and change configurations This key is also used to turn Valve Force Mode on DOWN Use this key to adjust setpoints and change configurations This key is also used to turn Valve Force Mode off ENTER ...

Page 11: ...T Screens Press to scroll through SETPOINT Screens Main Screens Map and Main MHG REHEAT Screens Main MHG REHEAT Screens Refer to the following map when navigating through the Main Screens From the MHG REHEAT Screen press ENTER to scroll through the screens MHG REHEAT S A MODE SA MODE LOCKED or COMM MODE SOFTWARE VER 3 06 ADDRESS CURRENT SOFTWARE VERSION In Stand Alone Mode the screen will display ...

Page 12: ...Air Temperature Setpoint The unit will leave the Reheat Mode when the unit leaves the Dehumidification Mode FLUSH This mode will display if the unit is performing a cooling flush cycle or a reheat flush cycle see Additional Features page 9 AUX If Aux operation has been enabled a 0 10 VDC signal can be used to proportionally modulate the MHGR Valve between 0 100 FORCE The unit is in the Force Mode VAL...

Page 13: ...MODE ON OFF screen press the UP arrow key to turn the FORCE MODE on and press the DOWN arrow key to turn the FORCE MODE off Use the UP and DOWN arrow keys to increase and decrease the percentage FORCE VALVES FORCE MODE ON OFF FRC VALV X FORCE VALVE PERCENTAGE This screen only appears when Force Mode is on This screen will appear when the Force Mode times out after 1 hour FORCE TIMEOUT Press the UP ...

Page 14: ...eshooting Relay LEDs FAN This green LED will light up to indicate that the relay for the FAN output is energized and its Normally Open Contact is closed COMP This green LED will light up to indicate that the relay for the COMP output is energized and its Normally Open Contact is closed VALVE This green LED will light up to indicate that the relay for the VALVE output is energized and its Normally ...

Page 15: ... or failed wiring Refer to chart in back of this guide for readings Verify the SAT OPTIONS jumper settings on the MHGRV X for the Supply Air Temperature Sensor Troubleshooting Figure 5 MHGRV X Controller LED Locations and Descriptions Communications Loss Check COMM LED on MHGRV X Verify 24 VAC power to all interconnected AAON controllers Verify E BUS connection between the MHGRV X and associated A...

Page 16: ...2 2 83 10 12 2 52500 2 77 15 9 4 45902 2 71 20 6 7 40147 2 64 25 3 9 35165 2 57 30 1 1 30805 2 49 35 1 6 27140 2 41 40 4 4 23874 2 33 45 7 2 21094 2 24 50 10 0 18655 2 15 52 11 1 17799 2 11 54 12 2 16956 2 08 56 13 3 16164 2 04 58 14 4 15385 2 00 60 15 6 14681 1 96 Temperature to Resistance Voltage Chart Temp F Temp C Resistance Ohms Voltage Input VDC 62 16 7 14014 1 93 64 17 8 13382 1 89 66 18 9 ...

Page 17: ...2 4 200 20 6 7 40147 4 095 25 3 9 35165 3 982 30 1 1 30805 3 862 35 1 6 27140 3 737 40 4 4 23874 3 605 45 7 2 21094 3 470 50 10 0 18655 3 330 52 11 1 17799 3 275 54 12 2 16956 3 217 56 13 3 16164 3 160 58 14 4 15385 3 100 60 15 6 14681 3 042 62 16 7 14014 2 985 64 17 8 13382 2 927 66 18 9 12758 2 867 68 20 0 12191 2 810 69 20 6 11906 2 780 70 21 1 11652 2 752 71 21 7 11379 2 722 72 22 2 11136 2 69...

Page 18: ...according to these instructions prior to testing the unit or else the modulating valve will not control properly and may damage your equipment Figure 6 Supply Air Temperature Sensor Installation Stand Alone Mode In Stand Alone Mode the SAT Sensor is connected to the MHGRV X Controller If in Stand Alone Mode the MHGRV X Controller is used in conjunction with a Stand Alone MODGAS X Controller the SA...

Page 19: ...tings SAT Wiring Conditions MODGAS X ONLY MHGRV X ONLY MODGAS X MHGRV X STAND ALONE Install Supply Air Sensor in MODGAS X Install Supply Air Sensor in MHGRV X Set SAT Options Jumpers to Normal Install Sensor in MODGAS X and daisy chain it to the MHGRV X Set SAT Options Jumpers to MODGAS X If connected to a MODGAS II Retrofit Set SAT Options Jumpers to MODGAS VCCX2 VCB X Install Supply Air Sensor in...

Page 20: ...to the appropriate Reheat Drive and Condenser Drive terminal blocks per Figure 3 page 6 Wire all other inputs and outputs per Figure 3 also Step 4 Set the SAT Options Jumper per Table 8 page 19 Step 5 Connect power to the MHGRV X Controller COMMUNICATIONS MODE OPERATION Step 1 Disconnect power from the MHGRV II Controller Step 2 The Supply Air Temperature Sensor needs to remain installed on whatev...

Page 21: ...ovide a system that allows the proper control of multiple sets of valves See Figure 8 for dimensions in inches Features Dimensions Figure 8 Reheat Expansion Module and Mounting Plate Dimensions Features The Reheat Expansion Module provides the following Up to 7 Reheat Expansion Modules can be used Each Reheat Expansion Module controls one set of reheat valves 1 Reheat 1 Condenser Each Reheat Expan...

Page 22: ...s do not stick out and touch adjacent terminals Confirm that all transducers required for your system are mounted in the appropriate location and wired into the correct terminals Installation Wiring Installation Mounting The Reheat Expansion Module is provided with a Chevron cut plastic snap track mounting base The snap track is designed to be mounted using a Hex Head Sheet Metal Screw provided to ...

Page 23: ...Module s Wiring Reheat Expansion Modules snap into each other at the power and Comm connectors Up to 7 Reheat Expansion Modules can be used Apply power to the first Reheat Expansion Module in a series The last Reheat Expansion Module in a series connects to the MHGRV X Controller using an EBC E BUS cable See Figure 9 below for details ...

Page 24: ...er Additional Features Reheat Coil Flush To assure positive oil return to the compressor the Hot Gas Reheat Coil will be flushed of liquid refrigerant by moving the Modulat ing Gas Reheat Valve to its maximum position for a short interval Cooling Flush If the unit is in cooling mode a flush will occur when the unit s flush cooling interval timer has elapsed The time is accumulated whenever it is in c...

Page 25: ...ting Communication LED COMM This amber LED will light up and blink once for every good packet received Packets should be sent once every second so Comm LED should blink the same once every second COMM LED should blink simultaneously on all modules Binary Input LED COMPRESSOR ENABLE This green LED will light up when the Reheat is enabled LED Troubleshooting POWER LED When the Reheat Expansion Modul...

Page 26: ...the Force Menu and manually drive the expansion module valves open and closed Q Are my valves wired correctly A Both valves per circuit should be wired to the same terminal block A The Condenser Valve should be wired from top to bottom BLACK WHITE RED GREEN A The Reheat Valve should be wired from top to bottom BLACK WHITE GREEN RED Q How do I confirm the expansion module is operating in Reheat Dehu...

Page 27: ...MHGRV X Field Technical Guide NOTES 27 ...

Page 28: ...AAON Part No V16950 Rev 01M Printed in the USA June 2018 All rights reserved 2018 AAON Controls Inc 8500 NW River Park Dr Parkville MO 64152 Phone 866 918 1100 www orioncontrols com Fax 816 505 1101 ...

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