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20MHGRVX-B2 Module Technical Guide

LCD SCREENS

Protected Screens

VALV RLY

VALVE RELAY

FLUSH, COMP2, or REHEAT

Configures how the VALVE relay operates.

VLV MAX

100

VALVE MAX

Used to configure the Max Reheat Valve %.

FLSH CND

DISABLED

FLUSH CONDENSER

Used to enable or disable condenser flushes.

Diagnostic Screens

Refer to the following map when navigating through the Diagnostic

Screens. From the DIAGNSTC Screen, press <ENTER> to scroll

through the screens.

DIAGNSTC

WDOG CNT

WATCH DOG TIMER

Displays the number of times the board has been reset due to

watchdog timer overflow.

PWER CNT

POWER LOSS COUNT

Displays the number of times the board has been

reset due to power loss.

STEP CNT

XXXX

STEP COUNT

Shows the step count status the valve is currently at.

Table of Contents3
Overview5
MHGRVX-B2 General Information5
Figure 1: MHGRVX-B2 Dimensions5
Wiring6
Installation and Wiring6
Table 1: MHGRVX-B2 Electrical and Environmental Requirements6
MHGRVX-B2 to AAON Unit Controller Wiring7
Figure 2: MHGRVX-B2 to AAON Unit Controller Wiring7
MHGRVX-B2 Stand-Alone Wiring8
Figure 3: MHGRVX-B2 Stand-Alone Wiring8
Inputs and Outputs9
Inputs9
Table 2: MHGRVX-B2 Inputs and Outputs9
Outputs10
Operation Modes11
Modes of Operation11
Additional Features13
Lcd Screens14
Navigation Keys14
Figure 4: LCD Display and Navigation Keys14
Table 3: Navigation Key Functions14
Main Screens Map and Main MHG REHEAT Screens15
Status and Alarm Screens16
Setpoint and Force Valves Screens17
Protected Screens18
Troubleshooting21
LED Diagnostics21
Table 4: STATUS LED Blink Codes21
Table 5: ALARM LED Blink Codes21
Alarms22
Figure 5: MHGRVX-B2 LED Locations and Descriptions22
Other Checks23
Table 6: 0-3V Temperature Sensor - Voltage and Resistance for Type III Sensors23
Table 7: 0-5V Temperature Sensor - Voltage and Resistance for Type III Sensors24
Appendix A: Sat Sensor25
Supply Air Temperature Sensor Installation25
Figure 6: Supply Air Temperature Sensor Installation25
SAT Sensor Wiring Guide and Jumper Settings26
Table 8: SAT Wiring Conditions26
Appendix B: Compatibility27
MHGRVX Series Drop-In Replacement27
Appendix C: Reheat Expansion Module28
Features and Dimensions28
Figure 7: Reheat Expansion Module Dimensions28
Installation and Wiring29
Wiring30
Figure 8: Reheat Expansion Module(S) Wiring30
Operation Modes31
Table 9: Reheat Expansion Module ALARM LED Blink Codes31
LED Diagnostics and Troubleshooting32
Figure 9: Reheat Expansion LED Locations and Descriptions32
Appendix D: Frequently Asked Questions33
Troubleshooting33

Brand	AAON
Model	ASM01670
Category	Controller
Language	English

AAON ASM01670 User Manual

Table of Contents

Questions and Answers:

AAON ASM01670 Specifications

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