MicroTech Unit Ventilator

Open Protocol Data Information Packet Version 2.2 Group: Controls Date: April 1996 MicroTech Unit Ventilator Open Protocol Data Communications 2002 McQuay International

- C O N F I D E N T I A L - This Document may not be copied or reproduced in any way without the express written consent of McQuay International. NOTICE Copyright 1996 McQuay International, Minneapolis MN All rights reserved throughout the world. McQuay International reserves the right to change any information contained herein without prior notice. No guarantees are given as to the accuracy of information provided. MicroTech Unit Ventilator Open Protocol 2

Contents Revision History... 4 Version 2.2... 4 Overview...5 Functional Goals of the Open Protocol for Unit Ventilators... 5 Introduction to Open Protocol Network Configuration... 6 OPM - Open Protocol Master Panel...8 Variables... 8 Configurations...9 Heating and Cooling Types... 9 Programs... 9 Heat Pump Unit Ventilators... 9 DX Cooling Unit Ventilators... 9 Chilled Water Unit Ventilators... 9 Heating Only Unit Ventilators... 10 Cooling Only Unit Ventilators... 10 Summary for Unit Ventilator Model Descriptions... 10 Inputs & Outputs...12 Common Inputs and Outputs... 12 UV1***... 13 UV2***... 13 UV3***... 14 UV4***... 14 UV5***... 15 UV6***... 15 UV7***... 16 Description of Operation...17 Control Temperature... 17 Unoccupied Heating (Night setback)... 17 Unoccupied Cooling (Night Setup)... 17 Occupied Heating... 17 Occupied Cooling... 18 Damper Control... 19 Electric Heat Control... 20 Variables...21 Unit Ventilator Read Only Memory Locations... 21 Unit Ventilator Read and Write Memory Locations... 25 Unit Ventilator Simulation Package...26 Required Development Testing Tools... 26 Set-up of Hardware for Testing... 26 Procedure for setting up the Network for Testing... 26 Glossary of Terms...28 Index...29 3 MicroTech Unit Ventilator Open Protocol

Revision History Version 2.2 This is a general upgrade and format change. Version 2.1 For all memory locations, added Unit Ventilator Model information since not all memory locations are applicable to all models. Added missing locations: Chilled Water Valve Position Face & Bypass Damper Position Hot Water Valve Position Removed Tenant Override Switch from the Read Only section. This memory location was erroneously included in both the "Read Only" and the "Read and Write" sections. The Water Out Temperature for Models 2 and 3 has been deleted and replaced with a refrigerant Suction Line Temperature. Corrected math errors in determining Run Hours and Compressor Starts. Corrected explanation for Mixed Air Temp, previous documentation indicated that when the sensor was not present, the value of the memory location would be 255, this was corrected to read 254. Added a summary for Unit Ventilator Model Descriptions. Updated all references to software program identifications to reflect current software versions. MicroTech Unit Ventilator Open Protocol 4

Overview Functional Goals of the Open Protocol for Unit Ventilators The McQuay International Open Protocol for unit ventilators allows other automation integrators the ability to communicate to a network of unit ventilators and obtain useful operating information via communication "reads" from the controller. In addition, remote control of the unit ventilator is possible by "writes" to the controller of new setpoints and commands. The result of the Open Protocol can be summarized as follows: Reading of the following operational information: Room Temperature Discharge Air Temp. Outdoor Air Temp. Mixed Air Temp. Water In Temp (For WSHP Units) Suction Line Temp (for WSHP Units) Outdoor Air Damper Position Hot Water or Steam Valve Position (When applicable) Chilled Water Valve Position (When applicable) Current Electric Heat Stage 1-3 (When applicable) Current Mode : Occupied or Unoccupied Mode: Heat or Cool Current Fault - 15 unique possible codes Compressor Output Status - On/Off No. of Compressor Starts Tenant Override Switch Status Supply Fan Status - On/Off Supply Fan Hours Face & Bypass Damper Position Current (Active) Heat/Cool Setpoints Tenant Room Setpoint Adjustment Pot(-3 F to 3 F) Outdoor Air Damper Position Setpoint Outdoor Air Damper Minimum Position Setpoint Face & Bypass Damper Position Setpoint Control of the Unit Ventilator: Ability to set time schedule as Occupied or Unoccupied Ability to set the active (current) Heating setpoint. Ability to set the active (current) Cooling setpoint. Ability to clear active Fault conditions. Ability to set a tenant override duration (request for after hour cooling or heating). Communications Status. 5 MicroTech Unit Ventilator Open Protocol

Introduction to Open Protocol Network Configuration This section will be used to explain how the McQuay Unit Ventilator Open Protocol Network works so that the correct equipment and program can be chosen to communicate through MicroTech Open Protocol. There are two (2) types of controllers that are used to make an Open Protocol Unit Ventilator Network. They are the Open Protocol Master (OPM) and the Unit Ventilators (UV's). Level 1 Open Protocol Master Unit Ventilator Level 2 Unit Ventilator The OPM provides a single communications port entry into the McQuay Unit Ventilator network. The OPM panel consists of an EnergyLine model 120 controller. The automation integrator connects to Comm port A, which will be pre configured for RS-232, 9600 baud. Port A is the automation control integrator's Open Protocol communications port. Comm port B is a daisy chained, multi-drop, 9600 baud RS-485 proprietary McQuay International protocol. The main function of the OPM is to provide network communication interface for up to 64 Unit Ventilator controllers. The unit ventilator controller is factory mounted. The unit controller replaces all controls with preprogrammed, pre-engineered and pre-tested stand-alone control. There is one controller for each unit ventilator. In addition to this hardware, McQuay's Unit Ventilator Open Protocol Monitor Software package is needed. This software is used to configure, commission, and troubleshoot the McQuay communications system. The software contains diagnostic routines which can be used to troubleshoot the McQuay network. This software is MS-DOS compatible to be used in all IBM PC's or 100% true compatibles. The Monitor Software is installed in the IBM or compatible PC, and the PC is connected to the OPM port "A" as shown: MicroTech Unit Ventilator Open Protocol 6

Level 1 Open Protocol Master Port A Port B Port B Monitor Software PC Port B Etc. Unit Ventilator Level 2 Unit Ventilator Once the McQuay communication network has been commissioned and is functional, the temperature control vendor can disconnect the monitor PC and connect a communicating device from the Building Automation System (BAS) Integrator's network. When the BAS Integrators communicating device is connected to the OPM panel the communications configuration is as follows: Level 1 Open Protocol Master Port A BAS Communications Device Port B Port B Port B Etc. Unit Ventilator Level 2 Unit Ventilator As mentioned earlier, the unit ventilator controller is a stand-alone device. In other words, the unit vent will continue to operate when communication is lost. However, the network must be intact for read and write requests from the BAS communication device to be passed along to the unit ventilators. If communication to the Unit Ventilators is lost, the Unit Ventilators will default to occupied mode, and the setpoints used for heating, cooling, and minimum Outdoor air damper position will be determined by the hardware potentiometers on the Unit Ventilator MicroTech controller. 7 MicroTech Unit Ventilator Open Protocol

OPM - Open Protocol Master Panel Variables This is the only memory location that will be able to be read in the Open Protocol Master Panel. It is used to see if the OPM is powered, communicating, and the applications code is intact. Open Protocol Master Status 0400 This is the status of the OPM. When looking at this address, it will have a number from 0 to 255. 0-254 Running 255 Not Running MicroTech Unit Ventilator Open Protocol 8

Configurations Heating and Cooling Types Cooling Types Heating Types Unit Ventilators come in many configurations. They can be self contained or split. If they are split, the supply fan and coil section are floor mounted or ceiling mounted with the condenser section remotely mounted outside. The condenser section includes a compressor, condenser coil, fan and reversing valve. There are several types of cooling and these include: Direct Expansion Chilled Water Water Source Heat Pump There are several types of heating and these include: Electric Hot Water/Steam Water Source Heat Pump Air to Air Heat Pump Programs There are seven (7) different unit ventilator programs that are used to control the many different styles and heating/cooling type configurations. The proper program and unit configuration is downloaded and tested at the factory. The different types and configurations are listed below with the program code number in parenthesis. AE = air source heat pump. (self contained) AT = ceiling mounted water source heat pump. (self-contained) AR = wall mounted water source heat pump. (self- contained) AZ = DX cooling. (self contained) AH = ceiling mounted. (split) AV = floor mounted. (split) Heat Pump Unit Ventilators AE, AV/AH ASHP w/ Electric Heat - ASHP (UV1S2*) AR/AT WSHP with Electric Heat - WSHP AR/AT WSHP w/o Electric Heat - WSHP (UV2S2*) (UV2S2*) DX Cooling Unit Ventilators AZ, AV/AH DX with Electric Heat AZ, AV/AH DX/wet Heat, Valve Control AZ, AV/AH DX/wet Heat, Damper Control (UV3S2*) (UV4S2*) (UV4S2*) Chilled Water Unit Ventilators AV/AH 2-pipe, Valve Control (UV5S2*) AV/AH 2-pipe, Damper Control (UV5S2*) AV/AH 4-pipe, Valve Control (UV6S2*) AV/AH 4-pipe, Damper Control (UV6S2*) AV/AH CW/El Ht, Valve Control (UV7S2*) AV/AH CW/El Ht, Damper Control (UV7S2*) 9 MicroTech Unit Ventilator Open Protocol

Heating Only Unit Ventilators AV/AH Electric Heat only AV/AH HW/Steam, Valve Control AV/AH HW/Steam, Damper Control Cooling Only Unit Ventilators AZ, AV/AH DX w/o Electric Heat AV/AH CW only, Valve Control AV/AH CW only, Damper Control (UV3S2*) (UV5S2*) (UV5S2*) (UV3S2*) (UV7S2*) (UV7S2*) Summary for Unit Ventilator Model Descriptions Mode l Program ID Unit Type Description 0 UV1*** AE/AV/AH w/electric Heat Air Source Heat Pump w/electric heat 2 UV2*** AR/AT w/electric Heat Water Source Heat Pump w/electric heat. 3 UV2*** AR/AT Water Source Heat Pump Only. 4 UV3*** AV/AH, AZ w/electric Heat DX cooling unit w/electric Heat 5 UV3*** AV/AH DX Only DX cooling unit only 6 UV3*** AV/AH w/electric Heat Only Electric Heat only. 7 UV4*** AZ/AV/AH Wet Heat, Valve Control 8 UV4*** AZ/AV/AH Wet Heat, Damper Control 9 UV5*** AV/AH Wet Heat Only, Valve Control 10 UV5*** AV/AH Wet Heat Only, Damper Control DX cooling unit w Stream or Hot Water Heat DX cooling unit w Stream or Hot Water Heat Steam or Hot Water Heating Only Steam or Hot Water Heating Only 11 UV5*** AV/AH 2 Pipe, Valve Control Chilled Water Cooling and Hot Water Heating (2 Pipe) 12 UV5*** AV/AH 2 Pipe, Damper Control Chilled Water Cooling and Hot Water Heating (2 Pipe) 13 UV6*** AV/AH 4 Pipe, Valve Control Chilled Water Cooling and Steam or Hot water heating. 14 UV6*** AV/AH 4 Pipe, Damper Control Chilled Water Cooling and Steam or Hot water heating. 15 UV7*** AV/AH CW Only, Valve Control Chilled Water Cooling Only. 16 UV7*** AV/AH CW Only, Damper Control Chilled Water Cooling Only. 17 UV7*** AV/AH CW, Elect Heat, Valve Control 18 UV7*** AV/AH CW, Elect Heat, Damper Control Chilled water Cooling and Electric Heat. Chilled water Cooling and Electric Heat. MicroTech Unit Ventilator Open Protocol 10

Reading ID's Program naming convention: UV1S2* UV = Unit Ventilator 1 = Program Type (1-7) S = Standalone (Open Protocol) Software 2 = Software Version = Software Revision (A,B,C...) To find out what program resides in the controller, read addresses 800A through 800F in ASCII. These 6 memory locations contain the software program identification (IDENT). 11 MicroTech Unit Ventilator Open Protocol

Inputs & Outputs Common Inputs and Outputs Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. 3. Outdoor Air Temperature 3. 4. Mixed Air Temperature 4. 5. 5. 6. 6. 7. 7. 8. 8. 9. 10. 11. 12. Day-night changeover device 13. 14. 15. Optional inputs and outputs: Offset/Tenant Override Mixed Air Temperature Day-night changeover MicroTech Unit Ventilator Open Protocol 12

UV1*** UV2*** Air Source Heat Pump Unit Ventilators Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Compressor On/Off 3. Outdoor Air Temperature 3. Reversing Valve On/Off 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. 5. Outdoor Air Damper Close 6. 6. Heating Stage 1 On/Off 7. Outdoor Air Damper Position 7. Heating Stage 2 On/Off 8. Brownout 8. Heating Stage 3 On/Off 9. 10. 11. 12. Day-night changeover device 13. Defrost/Emergency Heat 14. High Refrigeration Pressure 15. Low Temperature Water Source Heat Pump Unit Ventilators Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Compressor On/Off 3. Outdoor Air Temperature 3. Reversing Valve On/Off 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. Water In Temperature 5. Outdoor Air Damper Close 6. Suction Line Temperature 6. Heating Stage 1 On/Off 7. Outdoor Air Damper Position 7. Heating Stage 2 On/Off 8. Brownout 8. Heating Stage 3 On/Off 9. 10. 11. 12. Day-night changeover device 13. Emergency Heat 14. High Refrigeration Pressure 15. Low Temperature 13 MicroTech Unit Ventilator Open Protocol

UV3*** UV4*** Unit Ventilators with DX cooling and electric heat Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Compressor 3. Outdoor Air Temperature 3. 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. 5. Outdoor Air Damper Close 6. 6. Heating Stage 1 On/Off 7. Outdoor Air Damper Position 7. Heating Stage 2 On/Off 8. Brownout 8. Heating Stage 3 On/Off 9. 10. 11. 12. Day-night changeover device 13. Vent Control 14. High Refrigeration Pressure 15. Low Temperature Unit Ventilators with DX cooling and hot water/steam heat. Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Compressor On/Off 3. Outdoor Air Temperature 3. 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. Water In Temperature 5. Outdoor Air Damper Close 6. F&B Damper/Htg Valve Position 6. Htg Valve Close/F&B Forward 7. Outdoor Air Damper Position 7. Htg Valve Open/F&B Reverse 8. Brownout 8. End of Cycle Valve On/Off 9. 10. 11. 12. Day-night changeover device 13. Vent Control 14. High Refrigeration Pressure 15. Low Temperature MicroTech Unit Ventilator Open Protocol 14

UV5*** UV6*** Unit Ventilators with 2 pipe chilled water cooling & hot water/steam heat Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Cooling Valve Open 3. Outdoor Air Temperature 3. Cooling Valve Close 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. Water In Temperature 5. Outdoor Air Damper Close 6. F&B Damper/Valve Position 6. Valve Close/F&B Forward 7. Outdoor Air Damper Position 7. Valve Open/F&B Reverse 8. 8. End of Cycle Valve On/Off 9. 10. 11. 12. Day-night changeover device 13. Vent Control 14. 15. Low Temperature Unit Ventilators with 4 pipe chilled water cooling and hot water/steam heat. Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Cooling Valve Open 3. Outdoor Air Temperature 3. Cooling Valve Close 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. Water In Temperature 5. Outdoor Air Damper Close 6. F&B Damper/Htg Valve Position 6. Htg Valve Close/F&B Forward 7. Outdoor Air Damper Position 7. Htg Valve Open/F&B Reverse 8. 8. End of Cycle Valve On/Off 9. 10. 11. 12. Day-night changeover device 13. Vent Control 14. 15. Low Temperature 15 MicroTech Unit Ventilator Open Protocol

UV7*** Unit Ventilators with 4 pipe chilled water cooling and electric heat Inputs Outputs 0. Offset/Tenant Override 0. Status LED 1. Room Temperature 1. Supply Fan On/Off 2. Discharge Air Temperature 2. Cooling Valve Open / EOC Valve 3. Outdoor Air Temperature 3. Cooling Valve Close 4. Mixed Air Temperature 4. Outdoor Air Damper Open 5. Water In Temperature 5. Outdoor Air Damper Close 6. F&B Damper/Htg Valve Position 6. Heating Stage 1 / F&BP Damper 7. Outdoor Air Damper Position 7. Heating Stage 2 / F&BP Damper 8. 8. Heating Stage 3 9. 10. 11. 12. Day-night changeover device 13. Vent Control 14. 15. Low Temperature MicroTech Unit Ventilator Open Protocol 16

Description of Operation Control Temperature Temperature Calculation Control Following is a general description of operation. A more detailed description of operation is included in the Installation and Maintenance manual. Note that the control temperature for Unit ventilator is continually calculated by the MicroTech controller during occupied mode using the following equation: Control Temp = 19/20 * (Room Temp) + 1/20 * (Discharge Air Temp) Unoccupied Heating (Night setback) Water or Steam Heat Electric Heat Air Source Heat Pumps Chilled Water DX Cooling Heat Pump Occupied Heating The supply fan will cycle on when the control temperature is equal or below the Unoccupied Heating setpoint. The outdoor air damper will remain closed. If there is hot water or steam heat and the entering water temperature is above 80 F, the heating valve will be wide open or the face & bypass damper will be in the full face position. The discharge air temperature will not be allowed to go over 150 F. If there is electric heat, the first stage will be turned on when the control temperature falls one degree below the unoccupied heating setpoint. If, 30 seconds later, the control temperature is still below setpoint, another stage of heat will be turned on. If the control temperature is above or equal the setpoint plus 2 degrees, a stage of heat will be turned off. If, 30 seconds later, the control temperature is still above setpoint plus two degrees, another stage of heat will be turned off. The fan remains on whenever any stage of electric heat is on. If there is an air source heat pump, the compressor will come on in the heating mode whenever the control temperature falls below the unoccupied heating setpoint and will go off if the room temperature rises above setpoint. The first stage of electric heat will come on if the control temperature is at or below setpoint minus 2 degrees and the outdoor air temperature is below 20 F. If, 30 seconds later, the control temperature remains below setpoint minus 2 degrees, another stage of heat will be turned on. If the control temperature is at or above setpoint plus 2 degrees, a stage of heat will be turned off. If, after 30 seconds, the control temperature remains at or above setpoint plus 2 degrees, another stage of heat will be turned off. The fan remains on whenever Unoccupied Cooling (Night Setup) The supply fan will cycle on when the control temperature is at or above the Unoccupied Cooling setpoint. The outdoor air damper will remain closed. If there is chilled water cooling and the entering water temperature is below 80 F, the cooling valve will be wide open or the face & bypass damper will be in the full face position whenever the control temperature is above setpoint. The cooling valve will be closed or the face & bypass damper will be in the bypass position if the control temperature goes below setpoint minus 2 degrees deadband. If there is DX cooling, the compressor will be turned on when the control temperature goes one degree above the unoccupied cooling setpoint. It will be turned off if the control temperature goes below setpoint. If there is a heat pump, the compressor will come on in the cooling mode whenever the control temperature goes above the unoccupied cooling setpoint and will go off if the room temperature goes below setpoint. The supply fan is on and the outdoor air damper will modulate. If the room temperature is at or below the occupied heating setpoint minus 3 degrees, the damper will be closed. If the room temperature is greater than the occupied heating setpoint minus 3 degrees, the damper will be in the minimum position. If the outdoor air temperature is below 68 F (adj.), the dampers will be allowed to open for free cooling provided that the room temperature is above the ventilation cooling setpoint. 17 MicroTech Unit Ventilator Open Protocol

Water or Steam Heat Electric Heat Air Source Heat Pump Occupied Cooling If there is hot water or steam heat, the heating valve or face & bypass dampers will be modulated to maintain the occupied heating setpoint (for 2 pipe units the entering water temperature must be above 80 F). The discharge air temperature will not be allowed to go below 55 F (adj.). If there is electric heat, the first stage will be turned on when the temperature falls one degree below the occupied heating setpoint. If, 30 seconds later, the temperature is still below setpoint, another stage of heat will be turned on. If the temperature is at or above setpoint, a stage of heat will be turned off. If, 30 seconds later, the temperature is still at or above setpoint, another stage of heat will be turned off. The discharge air temperature will not be allowed to go below 55 F (adj.). If there is an air source heat pump, the compressor will come on in the heating mode whenever the room temperature falls below the occupied heating setpoint and will go off if the room temperature rises above setpoint. The first stage of electric heat will come on if the room temperature is at or below setpoint minus 2 degrees and the outdoor air temperature is below 20 F. If, 30 seconds later, the temperature remains below setpoint minus 2 degrees, another stage of heat will be turned on. If the temperature goes above setpoint minus 2 degrees or the outdoor air temperature goes above 20 F, a stage of heat will be turned off. If, after 30 seconds, the temperature remains above setpoint minus 2 degrees, another stage of heat will be turned off. The discharge air temperature will not be allowed to go below 55 F (adj.). Chilled Water DX Cooling Heat Pump The supply fan is on and the outdoor air damper will modulate. If the room temperature is at or above the occupied cooling setpoint plus 3 degrees, the damper will be closed. If the room temperature is less than the cooling setpoint plus 3 degrees, the dampers will be in the minimum position. If the outdoor air temperature is below 68 F (adj.), the damper will be allowed to open for free cooling provided that the room temperature is above the ventilation cooling setpoint. If there is chilled water cooling, the cooling valve or face & bypass dampers will be modulated to maintain the occupied cooling setpoint ( for 2 pipe units the entering water temperature must be below 80 F). If there is a DX cooling, the compressor will come on whenever the room temperature goes over the occupied cooling setpoint and will go off if the room temperature goes below setpoint. If there is a heat pump, the compressor will come on in the cooling mode whenever the room temperature goes over the occupied cooling setpoint and will go off if the room temperature goes below setpoint. MicroTech Unit Ventilator Open Protocol 18

Damper Control If Outdoor Air Temperature 68 F or over: Occupied Cooling Spt. Occupied Heating Spt. 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 Outdoor Air Dampers Closed Minimum Position Outdoor Air Dampers Closed If Outdoor Air Temperature is under 68 F: Occupied Cooling Spt. Ventilation Spt Occupied Heating Spt. 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 Outdoor Air Dampers Modulate Minimum Position Outdoor Air Dampers Closed 19 MicroTech Unit Ventilator Open Protocol

Electric Heat Control If Occupied: Occupied Cooling Spt. Occupied Heating Spt. 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 Stage Down Stage Up If Unoccupied: Occupied Heating Spt. Unoccupied Heating Spt 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 Stage Down Stage Up MicroTech Unit Ventilator Open Protocol 20

Variables Unit Ventilator Read Only Memory Locations Description Address Range Conversion Models Chilled Water & Hot Water Valve 0406 0-255 X*.5 = % 11 Only Position - 2 Pipe Unit Chilled Water & Hot Water Valve 041A 0-255 X*.5 = % 11 Only Position Setpoint - 2 Pipe Unit Chilled Water Valve Position 0406 0-255 X*.5 = % 13, 15, 17 Chilled Water Valve Position Setpoint 041A 0-255 X*.5 = % 13, 15, 17 Compressor Output Status 040F 0= Off, 1= On 0, 2, 3, 4, 5, 7, 8 Current (Active) Cool Spt 0416 0-255 X - 50 = F All Current (Active) Heat Spt 0417 0-255 X - 50 = F All Discharge Air Temperature 0402 0-255 X - 50 = F All Face & Bypass Damper Position 0406 0-255 X*.5 = % 8, 10, 12, 14, 16, 18 Face & Bypass Damper Position Setpoint 041A 0-255 X*.5 = % 8, 10, 12, 14, 16, 18 Fault 0424 See Below All Heat/Cool Mode 0425 0 = Temp All OK 1 = Cooling 2 = Heating Hot Water (or Steam) Valve 0406 0-255 X*.5 = % 7, 9 Position - 2 Pipe Units Hot Water (or Steam) Valve 041A 0-255 X*.5 = % 7, 9 Position Setpoint - 2 Pipe Units Hot Water (or Steam) Valve 0408 0-255 X*.5 = % 13 Only Position - 4 Pipe Unit Hot Water (or Steam) Valve 0409 0-255 X*.5 = % 13 Only Position Setpoint - 4 Pipe Unit Mixed Air Temperature 0404 0-255, X - 50 = F OPTIONAL No. of Compressor Starts 0446 Hi 0447 Lo 0-655,350 (256*Hi+Lo) *10=Starts Outdoor Air Damper Min Position 040D 0-255 X*.5 = % All Setpoint Outdoor Air Damper Position 040C 0-255 X*.5 = % All Outdoor Air Damper Position 040E 0-255 X*.5 = % All Setpoint Outdoor Air Temperature 0403 0-255 X - 50 = F All 0, 2, 3, 4, 5, 7, 8 21 MicroTech Unit Ventilator Open Protocol

Description Address Range Conversion Models Room Temperature 0401 0-255 X - 50 = F All Suction Line Temperature 0406 0-255 X - 50 = F 2, 3 Supply Fan Hours 0444 Hi 0-131,070 (256*Hi+Lo) All 0445 Lo *2=Hours Supply Fan Status 0211 0 = Off 1 = On All Tenant setpoint Potentiometer adjustment 0422 7-13, See Below Water In Temperature 0405 0-255 X - 50 = F 2, 3, 7-12, 14-18 Chilled Water & Hot Water Valve Position - 2 Pipe Unit 0406 This location contains the current chilled water & hot water valve position for a Model 11 (2 Pipe) unit. To get the actual valve position, read the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Chilled Water & Hot Water Valve Position Spt- 2 Pipe Unit 041A This location contains the chilled water & hot water valve position setpoint for a Model 11 unit. To get the actual damper or valve position setpoint, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Chilled Water Valve Position 0406 This location contains the current chilled water valve position for Models 13, 15, and 17. To get the actual valve position, read the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Chilled Water Valve Position Spt 041A This location contains the chilled water valve position setpoint for Models 13, 15, and 17. To get the actual damper or valve position setpoint, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Compressor Output Status 040F This location contains the status of the Compressor Output for units which have a compressor. A "0" indicates the output is off. A "1" indicates the output is on. Current (Active) Cool Spt 0416 This location contains the Current or Active Cooling Spt. This location contains the cooling setpoint after any Load Shedding, Setpoint Adjustments, or any other conditions that will change the normal cooling setpoint. To get the actual setpoint temperature, take the value and subtract 50, result is in F. Current (Active) Heat Spt 0417 This location contains the Current or Active Heating Spt. This location contains the heating setpoint after any Load Shedding, Setpoint Adjustments, or any other conditions that will change the normal heating setpoint. To get the actual setpoint temperature, take the value and subtract 50, result is in F. Discharge Air Temperature 0402 This location contains the current Discharge Air Temperature. To get the actual temperature, take the value and subtract 50, result is in F. Face & Bypass Damper Position 0406 This location contains the current Face & Bypass Damper position. To get the actual damper position, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. All MicroTech Unit Ventilator Open Protocol 22

Face & Bypass Damper Position or Valve Position Setpoint 041A This location contains the current Face & Bypass Damper or Valve Position Setpoint. To get the actual damper or valve position, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Fault 0424 This location contains the code of the current fault condition of the unit ventilator. The following table contains a complete list of faults and their corresponding value. Name Value None 0-5 Comm Error 188 Change Filter 189 Suction Line Temp. Sensor Bad 190 Water In Temp. Sensor Bad 191 Mixed Air Temp. Sensor Bad 192 OA Temp. Sensor Bad 193 Discharge Air Temp. Sensor Bad 194 OA Damper Position Pot. Bad 195 Heating Valve Position Pot. Bad 196 Cooling Valve Position Pot. Bad 197 Brownout 198 Low Temp. 199 Low Water Temp 200 High Pressure 201 Room Temp Sensor Bad 202 Heat/Cool Mode 0425 This location contains the current Heating/Cooling status of the Unit Ventilator. A "0" indicates that the control temperature is OK. A "1" indicates that the unit is in cooling. A "2" indicates that the unit is in heating. Hot Water (or Steam) Valve Position - 2 Pipe Units 0406 This location contain the current Hot Water (or Steam) Valve Position for Models 7 and 9. To get the actual damper or valve position, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Hot Water (or Steam) Valve Position Setpoint - 2 Pipe Units 041A This location contain the current Hot Water (or Steam) Valve Position setpoint for Models 7 and 9. To get the actual damper or valve position, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Hot Water (or Steam) Valve Position - 4 Pipe Unit 0408 This location contain the current Hot Water (or Steam) Valve Position for Model 13. To get the actual damper or valve position, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Hot Water (or Steam) Valve Position Setpoint - 4 Pipe Unit 041A This location contain the current Hot Water (or Steam) Valve Position setpoint for Model 13. To get the actual damper or valve position, take the values and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. 23 MicroTech Unit Ventilator Open Protocol

Mixed Air Temperature 0404 This location contains the current Mixed Air Temperature, if it exists. This is an optional sensor. If the sensor does not exist, this memory location should contain $FE (254 decimal). To get the actual temperature, take the value and subtract 50. No. of Compressor Starts 0446, 0447 These locations contain the number of compressor starts. To get the number of compressor starts, multiply the hi byte (0446) by 256 and add the lo byte (0447). Then take the sum and multiply by 10. The result is compressor starts, 0 to 655,350. Outdoor Air Damper Min Position Setpoint 040D This location contains the current Outdoor Air Damper Minimum Position Setpoint. This position setpoint is set by a potentiometer located on the unit ventilator controller board (Model 125 or 325). To get the actual setpoint, take the value and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Outdoor Air Damper Position 040C This location contains the current Outdoor Air Damper Position as indicated from a feedback signal from the actuator. To get the actual position, take the value and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Outdoor Air Damper Position Setpoint 040E This location contains the current Outdoor Air Damper Position Setpoint. To get the actual setpoint, take the value and multiply by 0.5. This will then give a value of 0-127.5 in.5% increments. Outdoor Air Temperature 0403 This location contains the current Outdoor Air Temperature. To get the actual outdoor air temperature, take the value and subtract 50. Room Temperature 0401 This location contains the current Room Temperature. To get the actual room temperature, take the value and subtract 50. Suction Line Temperature 0406 This location contains the refrigerant suction line temperature. To get the actual temperature, take the value and subtract 50, result is in F. Supply Fan Hours 0444, 0445 These locations contain the Supply Fan Hours. To get the number of supply fan run hours, multiply the hi byte (0444) by 256 and add the lo byte (0445). Take the sum and multiply by 2. The result is in hours, 0 to 131,070. Supply Fan Status 0211 This location contains the current status of the Supply Fan Output. A "0" indicates the output is off. A non zero value indicates the output is on. Tenant Setpoint Potentiometer Adjustment 0422 This locations contains the Tenant Setpoint Potentiometer Adjustment. This location is used to determine how much to offset the standard setpoint(s). The follow table shows adjustment values: Value Adjustment to Setpoint 7-3 F adjustment 8-2 F adjustment 9-1 F adjustment 10 0 F adjustment 11 1 F adjustment 12 2 F adjustment 13 3 F adjustment The adjustment is then used to "move" the setpoint(s) to their new values. MicroTech Unit Ventilator Open Protocol 24

Water In Temperature 0405 This location contains the current Water In Temperature. To get the actual temperature, take the value and subtract 50, result is in F. Unit Ventilator Read and Write Memory Locations The following locations are used by all models of Unit Ventilators: Description Address Range Conversion Clear Fault 0424 0-255 See Below CommCoolSptRam 0435 0-255 X - 50 = F CommHeatSptRam 0436 0-255 X - 50 = F CommStatusRam 0433 0-255 0 = No Comm, > 0 = Comm O.K. Tenant Override Time 0420 0-255 minutes TimeClockRam 0434 0-1 0 = Unoccupied, 1 = Occupied Clear Fault 0424 Write a zero to this memory location to clear an active fault. Note that if the fault condition is still true, the memory location will return to the fault code (see above). CommCoolSptRam 0435 This is the active cooling setpoint which the controller will control to when the CommStatusRam is non-zero. The only legitimate values to write to this memory location are between 115 and 140 (65 F and 90 F). If this location contains a non-legitimate value, the controller will use the default (on board potentiometer) heat and cool setpoints. CommHeatSptRam 0436 This is the active heating setpoint which the controller will control to when the CommStatusRam is non-zero. The only legitimate values to write to this memory location are between 105 and CommCoolSptRam - 6 F (55 F and CommCoolSptRam - 6 F deadband). If this location contains a non-legitimate value, the controller will use the default (on board potentiometer) heat and cool setpoints. CommStatusRam 0433 The automation integrator should continuously write to this memory location the number of minutes that the Unit Ventilator should control to setpoints written via communications. This memory location is decremented by a value of 1 every minute. If the memory location reaches zero, the controller will assume active communications has been lost, and control will be returned to the default setpoints of the controller. The default setpoints are determined by the position of the setpoint potentiometers on the controller and the status of the time clock digital input. Tenant Override Time 0420 Take the memory location and multiply by 5. This is the time remaining in the tenant override mode. To command the unit to tenant override mode, write the number of minutes of override desired divided by 5 ( e.g. for 60 minutes of override, write 12.) TimeClockRam 0434 Use this memory location to command a unit to occupied or unoccupied mode via communications. The CommStatus RAM must be non-zero or the controller will not respond to this memory location. 25 MicroTech Unit Ventilator Open Protocol

Unit Ventilator Simulation Package Required Development Testing Tools In order to develop and test an Open Protocol interface to the Unit Ventilators, the following is required: 1. McQuay International "Open Protocol Data Communications" document version 1.2 dated Feb. 24th, 1991 2. McQuay Open Protocol Hardware Simulator Package which includes: (1) Model 250 Controller (2) Model 125 Controllers (1) Model 120 Controller (or another 125 Controller may be used). 3. Power supply with power cord and adapter cables 4. RS-232 Communications cable package 5. RS-485 Communications cable package 6. Unit Ventilator Open Protocol Simulator Monitor Program (P/N 950433A-010) 7. Unit Ventilator Monitor Program Users Manual Set-up of Hardware for Testing One set-up which is particularly useful for proving out an Open Protocol interface is as shown below. In this arrangement, the Open Protocol interface is operational on Port A of the OPM panel. The Monitor program interface is operational on Port A of one of the Unit Ventilator Model 125's. Level 1 Open Protocol Master Port A BAS Communications (Addr. 00.00) Device Port B Port B Port B Etc. Unit Ventilator Level 2 Unit Ventilator (Addr. 01.00) (Addr. 02.00) Port A Monitor Software Procedure for setting up the Network for Testing 1. Connect power to the OPM Controller (a Model 120 or a Model 125 may be used as the OPM controller). MicroTech Unit Ventilator Open Protocol 26

2. Connect the MicroTech communications cables. Start with the OPM port B. Connect (daisy chain) the comm. cables to the (2) unit ventilators. For RS-485 pinout connections for each model controller, see the McQuay International "Open Protocol Data Communications" document version 1.2 dated Feb. 24th, 1991. 3. Connect the power supply for the (2) unit ventilators and power. 4. Set the Hex address switches on the OPM to Hi = F and Lo = F. And connect the PC comm. cable to Port A. 5. Install Unit Ventilator Open Protocol software onto PC and invoke the Monitor program with RUN.BAT. You should establish communications at 1200 baud. 6. Download the OPM01*.COD file to the OPM panel. 7. Next connect the PC cable to Port A of one of the free standing model 125's. Set the hex switches to Hi=F and Lo=F, power reset the controller. Establish communications with the Monitor program at 1200 baud. Download UV4PXK.COD to this controller. 8. Next connect the PC cable the other free standing model 125's. Set the hex switches to Hi=F and Lo=F and power reset the controller. Establish communications with the Monitor program at 1200 baud. Download UV4PXK.COD to this controller. 9. De-power the controllers, set the OPM and the two model 125's to have address switch settings as follows: Controller Hi Hex Switch Lo Hex Switch Resultant Address OPM Panel 0 0 00.00 Unit Vent #1 (M125) 0 1 01.00 Unit Vent #2 (M125) 0 2 02.00 10. Move the PC comm. cable back to the OPM, power the controllers, and establish communications. Confirm that you have established communications to each of the 3 controllers in the network (you may use the "Network Diagnostics" feature of the Monitor program or the "Read/Write Variables" feature of the Monitor program). 11. With communications within the network established, move the PC with the Monitor program running to Port A of the unit ventilator and again confirm that you have established communications. 12. Connect the BAS interface to Port A of the OPM panel and establish communications. 13. Confirm each read only and read/write variable which has been set up within your interface is properly interpreted and displayed by comparing the values which are available on the BAS with the values on the Monitor program. 27 MicroTech Unit Ventilator Open Protocol

Glossary of Terms Open Protocol Master The gateway by which BAS companies communicate with MicroTech controllers. Tenant Override An override mode that allows the unit to operate in the occupied mode for a set time period. Except for being temporary, Tenant Override operates identical to the occupied mode. MicroTech Unit Ventilator Open Protocol 28

Index C Chilled Water Valve Position, 5 6, 24 25 Clear Fault, 29 CommCoolSptRam, 29 CommHeatSptRam, 29 CommStatusRam, 29 Compressor Output Status, 24 26 D Discharge Air Temperature, 14 20 Faults, 26 F H Hot Water Valve Position, 24 25 M Mixed Air Temperature, 14 18 O Outdoor Air Damper Position, 6 7, 15 18 Outdoor Air Temperature, 14 18, 19 22 R Room Temperature, 14 18, 19 20 Tenant Override Time, 29 TimeClockRam, 29 T W Water In Temperature, 15 18 29 MicroTech Unit Ventilator Open Protocol

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