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Modular chiller controller gateway · BACnet points list
Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy) BACnet points list
Updated 28 October 2026
Short answer
The Multistack web portal is a gateway that talks to a COMPU25 chiller master controller over RS-232 and publishes its data as BACnet IP Analog and Binary Values. The BAS can start and stop the chiller, write the upper/lower chilled water setpoints, VSP and load limit, and read system temperatures, per-compressor status, suction and leaving water temperatures, coded fault values and a 20-entry fault review. This is an older product; the manual dates from 2008.
This page lists 187 BACnet objects for the Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy) — 10 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Multistack’s own free documentation, linked below.
- Manufacturer
- Multistack
- Model
- COMPU25 Chiller Controller - BACnet Web Portal (legacy)
- Equipment
- Modular chiller controller gateway
- Equipment type
- Chillers
- BACnet objects
- 187 (10 writable)
- Transport
- BACnet IP
- Firmware
- Not stated
- Default device instance
- 610001
- Also known as
- COMPU25, COMPUT25, Compu25, Multistack Web Portal, MS20/30/50, Multistack BACnet Portal
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BMS integration notes: Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy)
Integration in brief
Connect the portal's 10BaseT port to the BACnet IP network and discover device 610001. Start and stop the chiller with BV 33 and check BV 1 for the real state, since the chiller keypad can override it. Write the upper/lower setpoints and load limit to AV 135, 136 and 138, and supervise with the system water temperatures, capacity and fault points.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| BV 33 | on_off_ctrl_write_1 | Chiller on/off command (1 = on) | Write |
| AV 135 | upsetpt_write_1 | Upper setpoint (entering CHW at full load), 45-80 °F | Write |
| AV 136 | lowsetpt_write_1 | Lower setpoint (leaving CHW at full load), 35-70 °F | Write |
| AV 138 | load_limit_write_1 | Load limit command, 0-100 % | Write |
| BV 1 | on_off_ctrl_read_1 | Chiller on/off status | Read |
| BV 3 | remote_on_off_1 | EX2 remote start/stop input (1 = stopped) | Read |
| AV 2 | capacity_1 | Compressors running versus total | Read |
| AV 5 | echw_sys_temp_1 | Entering chilled water temperature | Read |
| AV 6 | lchw_sys_temp_1 | Leaving chilled water temperature | Read |
| AV 4 | current_faults_1 | Number of compressors in fault | Read |
Enable & remote start
BV 33 ON/OFF CONTROL turns the chiller on (1) or off (0) and should stay on while the BAS wants it running. The hard-wired EX2 input on the COMPU25 must also be closed for the chiller to run; its state shows on BV 3. Multistack also suggests a BAS dry contact on EX2 as an alternative to the network command.
Network setup
- Default device instance 610001; changing it needs Multistack.
- Default IP 192.168.1.101, mask 255.255.255.0, gateway 0.0.0.0, UDP port 47808, BACnet network number 6100.
- The portal runs BACnet IP only over its 10 Mbps 10BaseT port; the BAS supplies the CAT5 cable.
- Portal-to-COMPU25 link is RS-232 at 2400 baud, 8N1, fixed; maximum 50 ft, with the RS232/RS485 jumper set to RS-232.
- Addressing DIP switches should be set with 3 and 4 ON, 1, 2 and 5 OFF.
Watch out for
- BV 33 has the same priority as the chiller's keypad. If someone stops the chiller locally, BV 1 goes off while BV 33 stays on; the BAS must write BV 33 off briefly, then on again to restart.
- Write points are write-only; read the current values from the separate read points.
- FAULTS C1-C24 and FAULT 1-20 TYPE are coded numbers; decode them with the manual's fault tables (Off mode, Current, Reset, Record).
- Fault review entries rotate: MOST CURRENT FAULT (AV 154) says which of the 20 slots is newest.
- Most system faults (EX1, EX3, flow, low CHW temperature) need a reset at the COMPU25 before the chiller restarts.
Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy) BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AV | 1 | num_of_compressors_1 | # OF COMPRESSORS: compressors in the system (COMPU25 DIP setting) | Read | ||
| AVmin | 2 | capacity_1 | CAPACITY: compressors on versus total | Read | ||
| AV | 3 | demand_1 | DEMAND: current load versus design load | Read | ||
| AVmin | 4 | current_faults_1 | CURRENT FAULTS: number of compressors in fault | Read | ||
| AVmin | 5 | echw_sys_temp_1 | ENT CHW SYS TEMP: entering chilled water | °F | Read | |
| AVmin | 6 | lchw_sys_temp_1 | LEV CHW SYS TEMP: leaving chilled water | °F | Read | |
| AV | 7 | ecw_sys_temp_1 | ENT CW SYS TEMP: entering condenser water | °F | Read | |
| AV | 8 | lcw_sys_temp_1 | LEV CW SYS TEMP: leaving condenser water | °F | Read | |
| AV | 9 | lead_comp_read_1 | LEAD COMPRESSOR: first on, last off | Read | ||
| AV | 10 | load_limit_read_1 | LOAD LIMIT: system load limit | % | Read | |
| AV | 11 | upsetpt_read_1 | UPPER SET POINT: entering CHW target at full load | °F | Read | |
| AV | 12 | lowsetpt_read_1 | LOWER SET POINT: leaving CHW target at full load | °F | Read | |
| AV | 13 | vsp_read_1 | VSP: variable setpoint for no-load CHW temperature | % | Read | |
| AV | 14 | tdiff_read_1 | TDIFF: delay between compressor starts and stops | s | Read | |
| AV | 15 | fail_indic_read_1 | FAIL INDICATOR: failed-compressor share that trips the alarm output | % | Read | |
| AV | 16 | flush_time_read_1 | FLUSH TIME: hour the DDRS-210A blowdown valve cycles | Read | ||
| AV | 17 | flush_duration_read_1 | FLUSH DURATION: blowdown valve on time | s | Read | |
| AV | 18 | month_1 | MONTH: COMPU25 clock | Read | ||
| AV | 19 | day_1 | DAY: COMPU25 clock | Read | ||
| AV | 20 | year_1 | YEAR: COMPU25 clock | Read | ||
| AV | 21 | hour_1 | HOUR (TIME): COMPU25 clock | Read | ||
| AV | 22 | minute_1 | MINUTE (TIME): COMPU25 clock | Read | ||
| AV | 23 | faults_c1_1 | FAULTS C1: compressor 1 fault code | Read | ||
| AV | 24 | faults_c2_1 | FAULTS C2: compressor 2 fault code | Read | ||
| AV | 25 | faults_c3_1 | FAULTS C3: compressor 3 fault code | Read | ||
| AV | 26 | faults_c4_1 | FAULTS C4: compressor 4 fault code | Read | ||
| AV | 27 | faults_c5_1 | FAULTS C5: compressor 5 fault code | Read | ||
| AV | 28 | faults_c6_1 | FAULTS C6: compressor 6 fault code | Read | ||
| AV | 29 | faults_c7_1 | FAULTS C7: compressor 7 fault code | Read | ||
| AV | 30 | faults_c8_1 | FAULTS C8: compressor 8 fault code | Read | ||
| AV | 31 | faults_c9_1 | FAULTS C9: compressor 9 fault code | Read | ||
| AV | 32 | faults_c10_1 | FAULTS C10: compressor 10 fault code | Read | ||
| AV | 33 | faults_c11_1 | FAULTS C11: compressor 11 fault code | Read | ||
| AV | 34 | faults_c12_1 | FAULTS C12: compressor 12 fault code | Read | ||
| AV | 35 | faults_c13_1 | FAULTS C13: compressor 13 fault code | Read | ||
| AV | 36 | faults_c14_1 | FAULTS C14: compressor 14 fault code | Read | ||
| AV | 37 | faults_c15_1 | FAULTS C15: compressor 15 fault code | Read | ||
| AV | 38 | faults_c16_1 | FAULTS C16: compressor 16 fault code | Read | ||
| AV | 39 | faults_c17_1 | FAULTS C17: compressor 17 fault code | Read | ||
| AV | 40 | faults_c18_1 | FAULTS C18: compressor 18 fault code | Read | ||
| AV | 41 | faults_c19_1 | FAULTS C19: compressor 19 fault code | Read | ||
| AV | 42 | faults_c20_1 | FAULTS C20: compressor 20 fault code | Read | ||
| AV | 43 | faults_c21_1 | FAULTS C21: compressor 21 fault code | Read | ||
| AV | 44 | faults_c22_1 | FAULTS C22: compressor 22 fault code | Read | ||
| AV | 45 | faults_c23_1 | FAULTS C23: compressor 23 fault code | Read | ||
| AV | 46 | faults_c24_1 | FAULTS C24: compressor 24 fault code | Read | ||
| AV | 47 | c1_suct_temp_1 | C1 SUCT. TEMP: compressor 1 suction temperature | °F | Read | |
| AV | 48 | c1_lchw_temp_1 | C1 LCHW TEMP: compressor 1 leaving chilled water | °F | Read | |
| AV | 49 | c2_suct_temp_1 | C2 SUCT. TEMP: compressor 2 suction temperature | °F | Read | |
| AV | 50 | c2_lchw_temp_1 | C2 LCHW TEMP: compressor 2 leaving chilled water | °F | Read | |
| AV | 51 | c3_suct_temp_1 | C3 SUCT. TEMP: compressor 3 suction temperature | °F | Read | |
| AV | 52 | c3_lchw_temp_1 | C3 LCHW TEMP: compressor 3 leaving chilled water | °F | Read | |
| AV | 53 | c4_suct_temp_1 | C4 SUCT. TEMP: compressor 4 suction temperature | °F | Read | |
| AV | 54 | c4_lchw_temp_1 | C4 LCHW TEMP: compressor 4 leaving chilled water | °F | Read | |
| AV | 55 | c5_suct_temp_1 | C5 SUCT. TEMP: compressor 5 suction temperature | °F | Read | |
| AV | 56 | c5_lchw_temp_1 | C5 LCHW TEMP: compressor 5 leaving chilled water | °F | Read | |
| AV | 57 | c6_suct_temp_1 | C6 SUCT. TEMP: compressor 6 suction temperature | °F | Read | |
| AV | 58 | c6_lchw_temp_1 | C6 LCHW TEMP: compressor 6 leaving chilled water | °F | Read | |
| AV | 59 | c7_suct_temp_1 | C7 SUCT. TEMP: compressor 7 suction temperature | °F | Read | |
| AV | 60 | c7_lchw_temp_1 | C7 LCHW TEMP: compressor 7 leaving chilled water | °F | Read | |
| AV | 61 | c8_suct_temp_1 | C8 SUCT. TEMP: compressor 8 suction temperature | °F | Read | |
| AV | 62 | c8_lchw_temp_1 | C8 LCHW TEMP: compressor 8 leaving chilled water | °F | Read | |
| AV | 63 | c9_suct_temp_1 | C9 SUCT. TEMP: compressor 9 suction temperature | °F | Read | |
| AV | 64 | c9_lchw_temp_1 | C9 LCHW TEMP: compressor 9 leaving chilled water | °F | Read | |
| AV | 65 | c10_suct_temp_1 | C10 SUCT. TEMP: compressor 10 suction temperature | °F | Read | |
| AV | 66 | c10_lchw_temp_1 | C10 LCHW TEMP: compressor 10 leaving chilled water | °F | Read | |
| AV | 67 | c11_suct_temp_1 | C11 SUCT. TEMP: compressor 11 suction temperature | °F | Read | |
| AV | 68 | c11_lchw_temp_1 | C11 LCHW TEMP: compressor 11 leaving chilled water | °F | Read | |
| AV | 69 | c12_suct_temp_1 | C12 SUCT. TEMP: compressor 12 suction temperature | °F | Read | |
| AV | 70 | c12_lchw_temp_1 | C12 LCHW TEMP: compressor 12 leaving chilled water | °F | Read | |
| AV | 71 | c13_suct_temp_1 | C13 SUCT. TEMP: compressor 13 suction temperature | °F | Read | |
| AV | 72 | c13_lchw_temp_1 | C13 LCHW TEMP: compressor 13 leaving chilled water | °F | Read | |
| AV | 73 | c14_suct_temp_1 | C14 SUCT. TEMP: compressor 14 suction temperature | °F | Read | |
| AV | 74 | c14_lchw_temp_1 | C14 LCHW TEMP: compressor 14 leaving chilled water | °F | Read | |
| AV | 75 | c15_suct_temp_1 | C15 SUCT. TEMP: compressor 15 suction temperature | °F | Read | |
| AV | 76 | c15_lchw_temp_1 | C15 LCHW TEMP: compressor 15 leaving chilled water | °F | Read | |
| AV | 77 | c16_suct_temp_1 | C16 SUCT. TEMP: compressor 16 suction temperature | °F | Read | |
| AV | 78 | c16_lchw_temp_1 | C16 LCHW TEMP: compressor 16 leaving chilled water | °F | Read | |
| AV | 79 | c17_suct_temp_1 | C17 SUCT. TEMP: compressor 17 suction temperature | °F | Read | |
| AV | 80 | c17_lchw_temp_1 | C17 LCHW TEMP: compressor 17 leaving chilled water | °F | Read | |
| AV | 81 | c18_suct_temp_1 | C18 SUCT. TEMP: compressor 18 suction temperature | °F | Read | |
| AV | 82 | c18_lchw_temp_1 | C18 LCHW TEMP: compressor 18 leaving chilled water | °F | Read | |
| AV | 83 | c19_suct_temp_1 | C19 SUCT. TEMP: compressor 19 suction temperature | °F | Read | |
| AV | 84 | c19_lchw_temp_1 | C19 LCHW TEMP: compressor 19 leaving chilled water | °F | Read | |
| AV | 85 | c20_suct_temp_1 | C20 SUCT. TEMP: compressor 20 suction temperature | °F | Read | |
| AV | 86 | c20_lchw_temp_1 | C20 LCHW TEMP: compressor 20 leaving chilled water | °F | Read | |
| AV | 87 | c21_suct_temp_1 | C21 SUCT. TEMP: compressor 21 suction temperature | °F | Read | |
| AV | 88 | c21_lchw_temp_1 | C21 LCHW TEMP: compressor 21 leaving chilled water | °F | Read | |
| AV | 89 | c22_suct_temp_1 | C22 SUCT. TEMP: compressor 22 suction temperature | °F | Read | |
| AV | 90 | c22_lchw_temp_1 | C22 LCHW TEMP: compressor 22 leaving chilled water | °F | Read | |
| AV | 91 | c23_suct_temp_1 | C23 SUCT. TEMP: compressor 23 suction temperature | °F | Read | |
| AV | 92 | c23_lchw_temp_1 | C23 LCHW TEMP: compressor 23 leaving chilled water | °F | Read | |
| AV | 93 | c24_suct_temp_1 | C24 SUCT. TEMP: compressor 24 suction temperature | °F | Read | |
| AV | 94 | c24_lchw_temp_1 | C24 LCHW TEMP: compressor 24 leaving chilled water | °F | Read | |
| AV | 95 | fault_1_type_1 | FAULT 1 TYPE: fault review entry 1, type code | Read | ||
| AV | 96 | fault_2_type_1 | FAULT 2 TYPE: fault review entry 2, type code | Read | ||
| AV | 97 | fault_3_type_1 | FAULT 3 TYPE: fault review entry 3, type code | Read | ||
| AV | 98 | fault_4_type_1 | FAULT 4 TYPE: fault review entry 4, type code | Read | ||
| AV | 99 | fault_5_type_1 | FAULT 5 TYPE: fault review entry 5, type code | Read | ||
| AV | 100 | fault_6_type_1 | FAULT 6 TYPE: fault review entry 6, type code | Read | ||
| AV | 101 | fault_7_type_1 | FAULT 7 TYPE: fault review entry 7, type code | Read | ||
| AV | 102 | fault_8_type_1 | FAULT 8 TYPE: fault review entry 8, type code | Read | ||
| AV | 103 | fault_9_type_1 | FAULT 9 TYPE: fault review entry 9, type code | Read | ||
| AV | 104 | fault_10_type_1 | FAULT 10 TYPE: fault review entry 10, type code | Read | ||
| AV | 105 | fault_11_type_1 | FAULT 11 TYPE: fault review entry 11, type code | Read | ||
| AV | 106 | fault_12_type_1 | FAULT 12 TYPE: fault review entry 12, type code | Read | ||
| AV | 107 | fault_13_type_1 | FAULT 13 TYPE: fault review entry 13, type code | Read | ||
| AV | 108 | fault_14_type_1 | FAULT 14 TYPE: fault review entry 14, type code | Read | ||
| AV | 109 | fault_15_type_1 | FAULT 15 TYPE: fault review entry 15, type code | Read | ||
| AV | 110 | fault_16_type_1 | FAULT 16 TYPE: fault review entry 16, type code | Read | ||
| AV | 111 | fault_17_type_1 | FAULT 17 TYPE: fault review entry 17, type code | Read | ||
| AV | 112 | fault_18_type_1 | FAULT 18 TYPE: fault review entry 18, type code | Read | ||
| AV | 113 | fault_19_type_1 | FAULT 19 TYPE: fault review entry 19, type code | Read | ||
| AV | 114 | fault_20_type_1 | FAULT 20 TYPE: fault review entry 20, type code | Read | ||
| AV | 115 | fault_1_comp_1 | FAULT 1 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 116 | fault_2_comp_1 | FAULT 2 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 117 | fault_3_comp_1 | FAULT 3 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 118 | fault_4_comp_1 | FAULT 4 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 119 | fault_5_comp_1 | FAULT 5 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 120 | fault_6_comp_1 | FAULT 6 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 121 | fault_7_comp_1 | FAULT 7 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 122 | fault_8_comp_1 | FAULT 8 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 123 | fault_9_comp_1 | FAULT 9 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 124 | fault_10_comp_1 | FAULT 10 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 125 | fault_11_comp_1 | FAULT 11 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 126 | fault_12_comp_1 | FAULT 12 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 127 | fault_13_comp_1 | FAULT 13 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 128 | fault_14_comp_1 | FAULT 14 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 129 | fault_15_comp_1 | FAULT 15 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 130 | fault_16_comp_1 | FAULT 16 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 131 | fault_17_comp_1 | FAULT 17 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 132 | fault_18_comp_1 | FAULT 18 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 133 | fault_19_comp_1 | FAULT 19 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AV | 134 | fault_20_comp_1 | FAULT 20 COMP #: 0 = system, 1-24 = compressor | Read | ||
| AVmin | 135 | upsetpt_write_1 | UPPER SET POINT write, 45-80 °F | °F | Write | |
| AVmin | 136 | lowsetpt_write_1 | LOWER SET POINT write, 35-70 °F | °F | Write | |
| AV | 137 | vsp_write_1 | VSP write, 0-80 % | % | Write | |
| AVmin | 138 | load_limit_write_1 | LOAD LIMIT write, 0-100 % | % | Write | |
| AV | 139 | tdiff_write_1 | T-DIFF write, 15-200 seconds | s | Write | |
| AV | 140 | fail_indic_write_1 | FAIL INDICATOR write, 0-90 % | % | Write | |
| AV | 141 | lead_comp_write_1 | LEAD COMPRESSOR write, 1-24 | Write | ||
| AV | 142 | flush_time_write_1 | FLUSH TIME write, hour 0-23 | Write | ||
| AV | 143 | flush_duration_write_1 | FLUSH DURATION write, 0-300 seconds | s | Write | |
| AV | 144 | lp_0_9_1 | HRS @ 0-9%: run hours at this load band | h | Read | |
| AV | 145 | lp_10_19_1 | HRS @ 10-19%: run hours at this load band | h | Read | |
| AV | 146 | lp_20_29_1 | HRS @ 20-29%: run hours at this load band | h | Read | |
| AV | 147 | lp_30_39_1 | HRS @ 30-39%: run hours at this load band | h | Read | |
| AV | 148 | lp_40_49_1 | HRS @ 40-49%: run hours at this load band | h | Read | |
| AV | 149 | lp_50_59_1 | HRS @ 50-59%: run hours at this load band | h | Read | |
| AV | 150 | lp_60_69_1 | HRS @ 60-69%: run hours at this load band | h | Read | |
| AV | 151 | lp_70_79_1 | HRS @ 70-79%: run hours at this load band | h | Read | |
| AV | 152 | lp_80_89_1 | HRS @ 80-89%: run hours at this load band | h | Read | |
| AV | 153 | lp_90_100_1 | HRS @ 90-100%: run hours at this load band | h | Read | |
| AV | 154 | most_crnt_flt_1 | MOST CURRENT FAULT: newest fault review entry, 1-20 | Read | ||
| BVmin | 1 | on_off_ctrl_read_1 | ON/OFF STATUS: chiller on or off | Read | 0=Off; 1=On | |
| BV | 2 | ex1_fault_1 | EX1 FAULT DISPLAY: EX1 input fault, manual reset | Read | 0=Normal; 1=Fault | |
| BVmin | 3 | remote_on_off_1 | EX2 REMOTE OFF: remote start/stop input | Read | 0=Started (can run); 1=Stopped | |
| BV | 4 | ex3_fault_1 | EX3 FAULT DISPLAY: EX3 input fault, manual reset | Read | 0=Normal; 1=Fault | |
| BV | 5 | ex4_fault_1 | EX4 FAULT DISPLAY: power phase monitor input, auto reset | Read | 0=Normal; 1=Fault | |
| BV | 6 | low_chw_flow_1 | LOW CHW FLOW: chilled water flow switch fault | Read | 0=Normal; 1=Fault | |
| BV | 7 | low_cw_flow_1 | LOW CW FLOW: condenser water flow switch fault | Read | 0=Normal; 1=Fault | |
| BV | 8 | low_chw_temp_1 | LO CHW TEMP SYS: leaving chilled water below 36 °F | Read | 0=Normal; 1=Fault | |
| BV | 9 | c1_status_1 | COMP. 1 STATUS: compressor 1 on/off | Read | 0=Off; 1=On | |
| BV | 10 | c2_status_1 | COMP. 2 STATUS: compressor 2 on/off | Read | 0=Off; 1=On | |
| BV | 11 | c3_status_1 | COMP. 3 STATUS: compressor 3 on/off | Read | 0=Off; 1=On | |
| BV | 12 | c4_status_1 | COMP. 4 STATUS: compressor 4 on/off | Read | 0=Off; 1=On | |
| BV | 13 | c5_status_1 | COMP. 5 STATUS: compressor 5 on/off | Read | 0=Off; 1=On | |
| BV | 14 | c6_status_1 | COMP. 6 STATUS: compressor 6 on/off | Read | 0=Off; 1=On | |
| BV | 15 | c7_status_1 | COMP. 7 STATUS: compressor 7 on/off | Read | 0=Off; 1=On | |
| BV | 16 | c8_status_1 | COMP. 8 STATUS: compressor 8 on/off | Read | 0=Off; 1=On | |
| BV | 17 | c9_status_1 | COMP. 9 STATUS: compressor 9 on/off | Read | 0=Off; 1=On | |
| BV | 18 | c10_status_1 | COMP. 10 STATUS: compressor 10 on/off | Read | 0=Off; 1=On | |
| BV | 19 | c11_status_1 | COMP. 11 STATUS: compressor 11 on/off | Read | 0=Off; 1=On | |
| BV | 20 | c12_status_1 | COMP. 12 STATUS: compressor 12 on/off | Read | 0=Off; 1=On | |
| BV | 21 | c13_status_1 | COMP. 13 STATUS: compressor 13 on/off | Read | 0=Off; 1=On | |
| BV | 22 | c14_status_1 | COMP. 14 STATUS: compressor 14 on/off | Read | 0=Off; 1=On | |
| BV | 23 | c15_status_1 | COMP. 15 STATUS: compressor 15 on/off | Read | 0=Off; 1=On | |
| BV | 24 | c16_status_1 | COMP. 16 STATUS: compressor 16 on/off | Read | 0=Off; 1=On | |
| BV | 25 | c17_status_1 | COMP. 17 STATUS: compressor 17 on/off | Read | 0=Off; 1=On | |
| BV | 26 | c18_status_1 | COMP. 18 STATUS: compressor 18 on/off | Read | 0=Off; 1=On | |
| BV | 27 | c19_status_1 | COMP. 19 STATUS: compressor 19 on/off | Read | 0=Off; 1=On | |
| BV | 28 | c20_status_1 | COMP. 20 STATUS: compressor 20 on/off | Read | 0=Off; 1=On | |
| BV | 29 | c21_status_1 | COMP. 21 STATUS: compressor 21 on/off | Read | 0=Off; 1=On | |
| BV | 30 | c22_status_1 | COMP. 22 STATUS: compressor 22 on/off | Read | 0=Off; 1=On | |
| BV | 31 | c23_status_1 | COMP. 23 STATUS: compressor 23 on/off | Read | 0=Off; 1=On | |
| BV | 32 | c24_status_1 | COMP. 24 STATUS: compressor 24 on/off | Read | 0=Off; 1=On | |
| BVmin | 33 | on_off_ctrl_write_1 | ON/OFF CONTROL: chiller on/off command | Write | 0=Off; 1=On |
No points match these filters.
Integration notes
- Legacy product: the manual is dated May 2008. This copy is hosted by a third party (Chipkin), not on a Multistack site.
- Points exist for 24 compressors; AV 1 reports how many are actually installed.
- Write points (AV 135-143, BV 33) are write-only; read the values back from the matching read points (AV 9-17, BV 1).
- The manual's text gives different instance numbers for some points (write setpoints as AV 134-142, flush time/duration as AV 153/154) than its Table 3. Table 3 is self-consistent (AV 134 is FAULT 20 COMP #, AV 153-154 are HRS @ 90-100% and MOST CURRENT FAULT) and the text has other slips, so this list follows Table 3; confirm with a device discovery.
- Units are not printed in the table; temperatures follow the manual's degrees F.
- Object names are the table's reference names; the short labels (e.g. ENT CHW SYS TEMP) are in the descriptions.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the COMPU25 Chiller Controller - BACnet Web Portal (legacy) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy)
How many BACnet points does the Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy) have?
This list has 187 BACnet objects: 154 analog values, 33 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy) BACnet points are writable?
10 of the 187 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy) BACnet documentation?
The source is Multistack BACnet Portal Technical Manual - MS20/30/50 Application, BACnet over TCP/IP, revision 2008-05, published free by Multistack at https://cdn.chipkin.com/assets/uploads/imports/resources/Multistack%20Compu25%20-%20Legacy%20BACnet%20over%20TCPIP.pdf.
What are the minimum BACnet points to integrate the Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy)?
Start with BV 33 on_off_ctrl_write_1 (Chiller on/off command (1 = on)); AV 135 upsetpt_write_1 (Upper setpoint (entering CHW at full load), 45-80 °F); AV 136 lowsetpt_write_1 (Lower setpoint (leaving CHW at full load), 35-70 °F); AV 138 load_limit_write_1 (Load limit command, 0-100 %); BV 1 on_off_ctrl_read_1 (Chiller on/off status); BV 3 remote_on_off_1 (EX2 remote start/stop input (1 = stopped)); AV 2 capacity_1 (Compressors running versus total); AV 5 echw_sys_temp_1 (Entering chilled water temperature); AV 6 lchw_sys_temp_1 (Leaving chilled water temperature); AV 4 current_faults_1 (Number of compressors in fault).
How do I enable BMS control of the Multistack COMPU25 Chiller Controller - BACnet Web Portal (legacy)?
BV 33 ON/OFF CONTROL turns the chiller on (1) or off (0) and should stay on while the BAS wants it running. The hard-wired EX2 input on the COMPU25 must also be closed for the chiller to run; its state shows on BV 3. Multistack also suggests a BAS dry contact on EX2 as an alternative to the network command.
How do I check these points on the real COMPU25 Chiller Controller - BACnet Web Portal (legacy)?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
Source: Multistack BACnet Portal Technical Manual - MS20/30/50 Application, BACnet over TCP/IP · rev. 2008-05. Object names, instances and units are reproduced as published; descriptions are our own.