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ASHRAE Guideline 36 2018

ASHRAE Guideline 36 2018

$38.46

ASHRAE Guideline 36-2018 High-Performance Sequences of Operation for HVAC Systems

Published By Publication Date Number of Pages
ASHRAE 2018 102
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ASHRAE Guideline 36 provides uniform sequences of operation for HVAC systems that are intended to maximize the systems’ energy efficiency and performance, provide control stability, and allow for real-time fault detection and diagnostics. Standardized advanced control sequences provide benefits including reduced engineering time, reduced programming and commissioning time, reduced energy consumption, improved indoor air quality, and a common set of terms to facilitate communication between specifiers, contractors, and operators.

PDF Catalog

PDF Pages PDF Title
1 ASHRAE Guideline 36-2018
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This guideline provides detailed sequences of operation for HVAC systems.
2.2 This guideline describes functional tests that, when performed, will confirm implementation of the sequences of operation.
3. SET POINTS, DESIGN, and FIELD DETERMINED
3.1 Information Provided by Designer
5 Table 3.1.1.1 Default Set Points
6 Informative Table 3.1.1.3 Default CO2 Set Points per ASHRAE Standard 62.1
9 Informative Table 3.1.3 Example Zone-Group Table
11 3.2 Information Provided by (or in Conjunction with) the Testing, Adjusting, and Balancing Contractor
12 4. LIST OF HARDWIRED POINTS
13 4.1 VAV Terminal Unit—Cooling Only
4.2 VAV Terminal Unit with Reheat
14 4.3 Fan-Powered Terminal Unit (Series or Parallel, Constant- or Variable-Speed Fan)
4.4 Dual-Duct Terminal Unit with Inlet Sensors
15 4.5 Dual-Duct Terminal Unit with Discharge Sensor
4.6 Multiple-Zone VAV Air-Handling Unit
17 4.7 Dual-Fan Dual-Duct Heating VAV Air-Handling Unit
4.8 Single-Zone VAV Air-Handling Unit
18 5. SEQUENCES OF OPERATIONS
5.1 General
21 Table 5.1.14.3 Trim & Respond Variables
Informative Table 5.1.14.4 Example Sequence T&R Variables
22 Informative Figure 5.1.14.4 Example sequence trend graph.
26 5.2 Generic Ventilation Zones
27 Figure 5.2.1.3-1 Vmin* and Vbz-P* reset with CO2 loop.
28 Figure 5.2.1.3-2 Vmin* and Vbz-P* reset with CO2 loop (parallel fan-powered).
Figure 5.2.1.3-3 Vmin* and Vbz-P* reset with CO2 loop (SZVAV).
29 Figure 5.2.1.4-1 Vmin* reset with CO2 loop.
30 Figure 5.2.1.4-2 Vmin* reset with CO2 loop (parallel fan-powered).
Figure 5.2.1.4-3 Vmin* reset with CO2 loop (SZVAV).
31 5.3 Generic Thermal Zones
33 5.4 Zone Groups
35 Table 5.5.4 Set Points as a Function of Zone Group Mode
5.5 VAV Terminal Unit—Cooling Only
36 Figure 5.5.5 Control logic for cooling-only VAV zone.
5.6 VAV Terminal Unit with Reheat
37 Table 5.6.4 Set Points as a Function of Zone Group Mode
Figure 5.6.5 Control logic for VAV reheat zone.
39 Table 5.7.4 Set Points as a Function of Zone Group Mode
5.7 Parallel Fan-Powered Terminal Unit— Constant-Volume Fan
40 Figure 5.7.5-1 Control logic for constant-volume parallel fan-powered VAV zone (OA-min > Vmin).
Figure 5.7.5-2 Control logic for constant-volume parallel fan-powered VAV zone (OA-min < Vmin).
41 Table 5.8.5 Set Points as a Function of Zone Group Mode
5.8 Parallel Fan-Powered Terminal Unit— Variable-Volume Fan
42 Figure 5.8.5 Control logic for variable-volume parallel fan-powered VAV zone.
44 5.9 Series Fan-Powered Terminal Unit— Constant-Volume Fan
Table 5.9.4 Set Points as a Function of Zone Group Mode
Figure 5.9.5 Control logic for constant-volume series fan-powered VAV zone.
46 5.10 Series Fan-Powered Terminal Unit— Variable-Volume Fan
Table 5.10.4 Set Points as a Function of Zone Group Mode
Figure 5.10.5 Control logic for variable-volume series fan-powered VAV zone.
48 5.11 Dual-Duct VAV Terminal Unit— Snap-Acting Control
Table 5.11.4 Set Points as a Function of Zone Group Mode
49 Figure 5.11.5-1 Control logic for snap-acting dual-duct VAV zone (transition to cooling).
Figure 5.11.5-2 Control logic for snap-acting dual-duct VAV zone (transition to heating).
51 5.12 Dual-Duct VAV Terminal Unit— Mixing Control with Inlet Airflow Sensors
52 Table 5.12.4 Set Points as a Function of Zone Group Mode
Figure 5.12.5 Control logic for mixing dual-duct VAV zone with inlet sensors.
53 5.13 Dual-Duct VAV Terminal Unit—Mixing Control with Discharge Airflow Sensor
54 Table 5.13.4 Set Points as a Function of Zone Group Mode
Figure 5.13.5 Control logic for mixing dual-duct VAV zone with discharge sensor.
55 5.14 Dual-Duct VAV Terminal Unit—Cold-Duct Minimum Control
56 Table 5.14.4 Set Points as a Function of Zone Group Mode
Figure 5.14.5 Control logic for mixing dual-duct VAV zone with cold-duct minimum.
57 5.15 Air-Handling Unit System Modes
5.16 Multiple-Zone VAV Air-Handling Unit
Table 5.16.1.2 Trim & Respond Variables
58 Figure 5.16.2.2 Example supply air temperature reset diagram.
Table 5.16.2.2 Trim & Respond Variables
60 Figure 5.16.2.3-1 SAT loop mapping with relief damper or relief fan.
Figure 5.16.2.3-2 SAT loop mapping with return-fan control with airflow tracking.
Figure 5.16.2.3-3 SAT loop mapping with return-fan control with direct building pressure controls.
64 Figure 5.16.6.3 Minimum outdoor airflow control mapping with single damper.
66 Figure 5.16.10.5 Exhaust damper position and return-fan DP reset
69 Table 5.16.4.2 VAV AHU Operating States
Figure 5.16.14.2 VAV AHU operating states.
70 Table 5.16.14.5 VAV AHU AFDD Internal Variables
71 Table 5.16.14.6 VAV AHU Fault Conditions
74 5.17 Dual-Fan Dual-Duct Heating VAV Air-Handling Unit
Table 5.17.1.2 Trim & Respond Variables
Table 5.17.1.2 Trim & Respond Variables
76 Table 5.17.4.4 DFDD Heating AHU AFDD Internal Variables
Table 5.17.4.5 DFDD Heating AHU Fault Conditions
5.18 Single-Zone VAV Air-Handling Unit
78 Figure 5.18.4.5-1 Control diagram for SZVAV AHU.
Figure 5.18.4.5-2 Control diagram for SZVAV AHU—fan speed.
Figure 5.18.4.5-3 Control diagram for SZVAV AHU—supply air temperature.
79 Figure 5.18.5.2 SZVAV AHU supply air temperature loop mapping.
80 Figure 5.18.6.2 SZVAV AHU minimum outdoor air control.
82 Table 5.18.13.2 SZVAV AHU Operating States
Figure 5.18.13.2 SZVAV AHU operating states.
84 Table 5.18.13.5 SZVAV AHU Internal Variables
85 Table 5.18.13.6 SZVAV AHU Fault Conditions
88 INFORMATIVE APPENDIX A—CONTROL DIAGRAMS
Figure A-1 VAV terminal unit, cooling only.
89 Figure A-2 VAV terminal unit with reheat.
Figure A-3 Parallel fan-powered terminal unit, constant-volume fan.
90 Figure A-4 Parallel fan-powered terminal unit, variable-volume fan.
Figure A-5 Series fan-powered terminal unit, constant-volume fan.
91 Figure A-6 Series fan-powered terminal unit, variable-volume fan.
Figure A-7 Dual-duct terminal unit with inlet sensors.
92 Figure A-8 Dual-Duct terminal unit with discharge sensor.
93 Figure A-9 Multiple-zone VAV air-handling unit with return fan and minimum OA measurement station.
94 Figure A-10 Multiple-zone VAV air-handling unit with relief fan and differential pressure OA measurement.
95 Figure A-11 Dual-fan dual-duct heating VAV air-handling unit.
96 Figure A-12 SZVAV AHU (return-fan option).
97 INFORMATIVE APPENDIX B—ABBREVIATIONS AND ACRONYMS

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