1. Application
The VRF DX-coil Interface (DDC type) enables BMS capacity demand control of Toshiba Outdoor units connected to a DX COIL (with a field supplied AHU). It is compatible with either a Toshiba VRF system.
| Product | Model Name | Capacity | HP |
|---|---|---|---|
| Dx-coil controller | TCB-IFDDC201E | 22.4kW, 28.0kW, 45.0kW, 50.4kW, 56.0kW 90kW, 101kW, 112kW | 8, 10, 16, 18, 20 32, 36, 40 |
| Dx-valve kit | RBM-A101VAE | 22.4kW, 28.0kW | 8, 10 |
| RBM-A201VAE | 45.0kW, 50.4kW, 56.0kW | 16, 18, 20 |
2. System Compatibility, Overview
Compatible Outdoor Units:
- SMMS-e Cooling Only Model (MMY-MAP***6T8*P* / MMY-MAP***6T7*P)
- SMMS-7 Cooling Only Model (MMY-MAP***7T8*P* / MMY-MAP***7T7*P)
- SMMS-e Heat Pump Model (MMY-MAP***6HT8*P* / MMY-MAP***6HT7*P*)
- SMMS-u Heat Pump Model (MMY-MUP***1HT8*P* / MMY-MUP***1HT7*P*)
- SMMS∞ Cooling Only Model (MMY-MUP***1T8*P*/ MMY-MUP***1T7*P)
* For SMMS∞ and SMMS-u Heat Pump Models, the system communication type will become "TCC-Link" according to the Dx-coil controller (TCB-IFDTA201E, TCC-Link type).
Diversity: 75% - 100%
Overview Schematic: A diagram shows the system components including Outdoor Unit, Remote Controller, Communication Line, Dx-coil controller, PMV control, Dx-valve kit, and AHU. Sensors like TA (Suction air temperature), TCJ, TC1, TC2 (Evaporator temperature), and TDF (AHU discharge air temperature) are indicated.
3. Operating Conditions
Ensure the "Coil on Air" temperature is within the range of the Dx-coil design guideline.
AHU Diagram: Illustrates airflow within an AHU, showing Fresh Air (OA), Return Air (RA), Supply Air (SA), Coil on Air (CA), and Exhaust Air (EA). It includes a Heat Recovery Exchanger and a DX coil.
| Guideline HP (Heating & Cooling) | Guideline for Cooling Only Pattern A | Guideline for Cooling Only Pattern B | |
|---|---|---|---|
| Cooling mode "Coil on Air" temp. | 15-24°C WB (18-32°C DB) | 15-24°C WB | 15-32°C WB |
| Heating mode "Coil on Air" temp. | 12-28°C DB (Pull down to 7°C) | - | - |
Note: If intake air temperature is out of range, system damage may occur.
Outdoor unit: Refer to the specification of the outdoor unit.
4. Pipe Size
Pipe diameter specifications for various outdoor unit capacities are provided in a table, detailing Gas Pipe, Liquid Pipe to AHU, and Liquid Pipe to Y-Joint.
| Outdoor Unit Capacity | Gas Pipe | Liquid Pipe Valve kit to AHU | Liquid Pipe Valve kit to Y-Joint |
|---|---|---|---|
| 8 HP | Ø19.1 or 22.2 | Ø12.7 | |
| 10 HP | Ø22.2 | Ø12.7 | |
| 16 HP | Ø28.6 | Ø 15.9 | |
| 18 HP | Ø28.6 | Ø 15.9 | |
| 20 HP | Ø28.6 | Ø 15.9 | |
| 32 HP | Ø34.9 | Ø 15.9 | Ø 19.1 |
| More than 36HP | Ø 41.3(38.1※1) | Ø 15.9 | Ø 22.2 |
※ 1 Only SMMS-u, SMMS∞
5. Pipe length and height difference
Main pipe equivalent length:
- Total piping length (real length): Same as piping length restriction of VRF ODU
- Furthest equivalent pipe length L (real length): 120 m (100 m)
- Furthest equivalent pipe length between outdoor unit: 100m
Max. Height Difference:
- Outdoor unit - indoor unit (Upper outdoor unit): 40m
- Outdoor unit - indoor unit (Lower outdoor unit): 40m
Amount of Additional Refrigerant: Refer to specification of Outdoor unit.
6. Product Configuration
6.1 Product Configuration
A table details the DX COIL type, Dx-coil Controller, and Dx-Valve kit, specifying the number of connectable DX-coils for different capacities (8HP to 40HP).
| DX COIL type | Normal | Dx-coil Controller | Dx-Valve kit | |
|---|---|---|---|---|
| Type | RBM-A101VAE | RBM-A201VAE | ||
| Model Name | TCB-IFDDC201E | |||
| 8HP | 1 | 1 | - | |
| 10HP | 1 | 1 | - | |
| Connectable Dx-coil Capacity | 16HP | 1 | 1 | - |
| 18HP | 1 | 1 | - | |
| 20HP | 1 | 1 | - | |
| 32HP | 1 | - | 2 | |
| 36HP | 1 | - | 2 | |
| 40HP | 1 | - | 2 | |
6.2 Major Specifications
TCB-IFDDC201E (Dx-coil Controller)
Description: Dx-coil controller in Metal Enclosure, comprising: MCC-1570 (Main Indoor(DX) P.C. board), TX-TOS1413 (DDC(0-10V) interface P.C. board), 24VAC Transformer, TA Sensor (Yellow), TC1 Sensor (Brown), TC2 Sensor (Black), TCJ Sensor (Red), and Strainers.
External Dimensions: H x W x D (mm): 420 x 330 x 95
Net Weight: 6.0 kg
Notes: Capacity code (DN11) needs setup via wired remote controller. Only Heating and Cooling Modes are available (No Automatic or Fan Only). Components supplied loose, requires brazing and local pipework.
RBM-A101VAE / RBM-A201VAE (Dx-valve kit)
Description: The PMV (Pulse Motor Valve, 2 models), comprising: PMV body & PMV Motor, Terminal Block.
- RBM-A101VAE: 8HP & 10HP Size
- RBM-A201VAE: 16HP & 18HP & 20HP Size
6.3 Control Input / Output Details
Input functions
| Input | Name | Description |
|---|---|---|
| A1 A2 | Capacity Demand Analog Input (DC 0 - 10 V) | Analogue Input to control Capacity demand. (Details in section 6.4). SW3 bit-2 (TX-TOS1413) OFF: STEPPED response to analogue input. SW3 bit-2 (TX-TOS1413) ON: LINEAR response to analogue input. To ease integration with DDC, capacity control can be STEPPED or LINEAR. Use SW03 bit2 on the DDC(0-10V) interface P.C. board (TX-TOS1413) to select response. |
| C1 C2 | External ON / OFF Input | Digital Input to control ON / OFF: ON (Closed) / OFF (Open). External ON/OFF input signal type (pulse / static) is selectable by Jumper Wire J01 on the Indoor(DX) P.C. board - MCC-1570. Connect (Default): Pulse / Cut: Static. Unit will not operate until an appropriate 0-10V Capacity Control signal is received. |
| C3 C4 | Demand Signal Input | When signal input, AHU is in "thermostat-off" status forcibly. |
| C5 C6 | Safety contact | If this contact is open for more than 1 minute, check code "P10" is generated and the Dx-coil controller switches off automatically. |
| C7 C8 | Fan Motor Trouble Input | An AHU fan operation monitor (Field supply) can be attached at this dry contact terminal. For example, fan motor abnormality. A closed contact generates check code "L30". |
| C23 C24 | Operation Mode Input | Digital Input to control Mode: HEAT (Closed) / COOL (Open). |
Output functions
| Output | Name | Description |
|---|---|---|
| D1 D2 | Fan Motor Digital Output | Fan control signal output. Usually ON during operation, OFF during defrosting. |
| D5 D6 | Alarm Active Digital Output | During Alarm operation, Alarm Active Digital Output is active. |
| D7 D8 | Defrost Mode Digital Output | During Defrost operation, Defrost Mode Output is active. |
| D19 D20 | Thermostat On Digital Output | Thermostat ON signal output. Usually ON during operation. |
| D31 D32 | DO_1 Digital Output1 (User Defined) | Output function set using rotary switch "SW1" on the DDC(0-10V) interface P.C board(TX-TOS1413). Options: 0-Lower than capacity demand, 1-Higher than capacity command, 2-Cooling oil recovery/heating refrigerant recovery, 3-Cooling output, 4-Heating output, 5-Thermostat ON, 6~F-No function. |
| D33 D34 | DO_2 Digital Output2 (User Defined) | Output function set using rotary switch "SW2" on the DDC(0-10V) interface P.C board(TX-TOS1413). Options: 0-Lower than capacity demand, 1-Higher than capacity command, 2-Cooling oil recovery/heating refrigerant recovery, 3-Cooling output, 4-Heating output, 5-Thermostat ON, 6~F-No function. |
6.4 Analogue Input Control Details
Capacity Demand signal (analogue input voltage) is the main control value for compressor frequency. Capacity control may be affected by air-conditioner state (e.g., during oil recovery, defrost).
1) Demand 0-10V STEPPED control (SW3 bit-2 on the DDC(0-10V) interface P.C board(TX-TOS1413) "OFF")
Charts show STEPPED Capacity Demand (V) vs. percentage for Cooling and Heating modes, for both SMMS-e,7 and SMMS-u,∞ systems.
2) Demand 0-10V LINEAR control (SW3 bit-2 on the DDC(0-10V) interface P.C board(TX-TOS1413) "ON")
Charts show LINEAR Capacity Demand (V) vs. percentage for Cooling and Heating modes, for both SMMS-e,7 and SMMS-u,∞ systems.
7. AHU / DX COIL Design
7.1 Equipment selection procedure -Selection flow chart-
A flowchart outlines the process for selecting AHU/DX COIL equipment:
- Determine air-conditioning load at each room.
- Preliminary selection of AHU/FAHUs based on load.
- Calculate corrected capacity A for each AHU/FAHU by correcting for indoor temperature.
- Preliminary selection of outdoor unit based on total corrected capacity A. Check connectable AHU/FAHUs number and diversity.
- Calculate corrected capacity B for each AHU/FAHU by considering pipe length and height difference, and other correction factors (indoor temperature, outdoor temperature, pipe length/lift, outdoor unit diversity, frost condition).
- If corrected capacity B is sufficient, proceed. Otherwise, adjust outdoor unit capacity or AHU/FAHU capacity.
- Calculate corrected capacity C for each indoor unit by multiplying the total corrected capacity of the outdoor unit by proportional division of each indoor unit's standard capacity.
- If corrected capacity C is sufficient, the design is complete.
AHU / DX COIL Design Notes:
- Cooling & Heating output figures are based on calculations and general test data; figures are approximations.
- 3rd Party DX COIL properties affect performance.
- For AHU/DX COIL on-site design, refer to AHU submittal.
- DX COIL must be suitable for R410A.
- Design should allow operation of Evaporator and Condenser based on usage.
- Counter flow principle must be observed for DX COIL design.
- A Drain Pan must be fitted (even if only used in Heat mode) due to defrost cycles.
7.2 Correction charts for Outdoor unit capacity calculation
[1] Coil on Air temperature vs. capacity correction value
Cooling: A chart shows capacity correction value against Coil on Air wet bulb temp. (°C).
Heating: A chart shows capacity correction value against Coil on Air dry bulb temp. (°C).
7.3 How to select DX COIL Design Guideline
STEP 1: Confirm with AHU's submittal. Select AHU Operating mode: [Cooling only use] or [Cooling & Heating use].
STEP 2: Based on the selected mode, choose the appropriate guideline:
- Guideline HP (Existing Guideline): For [Cooling & Heating Use].
- Guideline Cooling Only (New Guideline): For [Cooling Only Use].
* It is possible to connect SMMS-e, u H/P models in Cooling only mode. Setup Function CODE (DN code) [0F]: "0000" to "0001" by a wired remote controller.
Guideline CO - Pattern A:
- Cooling mode coil "Air On" temperature: [15-24°C WB]
- Evaporator Air Suction Temp. (Design temp): [27 °C DB / 19°C DB]
Guideline CO - Pattern B:
- Cooling mode coil "Air On" temperature: [15-32°C WB]
- Evaporator Air Suction Temp: [33 °C DB / 28°C DB]
7.4 DX COIL Guideline HP
A table provides specifications for various HP capacities, including TCB-IFDDC2011, RBM-A101VAE, RBM-A201VAE, AHU Air Flow rate, DX Coil Internal volume, Copper Tube Dia., Max. Capacity (kW) for Cooling and Heating, Coil on Air Temp., Evaporating Temp., Superheat, and Air Suction Temp.
A table details the Number of Circuits by DX Coil Copper Tube Dia. and DX Coil Size (HP).
7.5 DX COIL Guideline CO Pattern A
A table provides specifications for Guideline CO Pattern A for various HP capacities, including TCB-IFDDC201日, RBM-A101VAE, RBM-A201VAE, AHU Air Flow rate, DX Coil Internal volume, Copper Tube Dia., Max. Capacity (kW) for Cooling and Heating, Coil on Air Temp., Evaporating Temp., Superheat, and Air Suction Temp.
A table details the Number of Circuits by DX Coil Copper Tube Dia. and DX Coil Size (HP).
* It is able to connect SMMS-e H/P model when you set it as Cooling only mode. Please setup the Function CODE(DN code) [0F] : "0000" to "0001" by a wired remote controller.
7.6 DX COIL Guideline CO Pattern B
A table provides specifications for Guideline CO Pattern B for various HP capacities, including TCB-IFDDC201日, RBM-A101VAE, RBM-A201VAE, AHU Air Flow rate, DX Coil Internal volume, Copper Tube Dia., Max. Capacity (kW) for Cooling and Heating, Coil on Air Temp., Evaporating Temp., Superheat, and Air Suction Temp.
A table details the Number of Circuits by DX Coil Copper Tube Dia. and DX Coil Size (HP).
* It is able to connect SMMS-e H/P model when you set it as Cooling only mode. Please setup the Function CODE(DN code) [0F] : "0000" to "0001" by a wired remote controller.
7.7 DX COIL Manufacturing
DX COIL & Pipework Design Pressure: 4.15MPa
DX COIL & Pipework Burst Pressure (withstand): 12.45MPa (more than 3 x Design Pressure)
DX COIL Contamination:
- Ensure the DX COIL is cleaned after manufacture to remove contaminants.
- Do not use chlorinated detergent during cleaning.
- Do not leave flux on or inside the DX COIL.
DX COIL & Pipework Contamination (Allowable Limits):
- Residual water amount: 0.6 mg / m
- Residual oil amount: 0.5 mg / m
- Amount of solid contaminants: 1.8 mg / m
The allowable contaminant levels assume Ø9.52mm copper tube.
7.8 DX Controller Installation
Installation Site: Avoid direct sunlight, outdoor installation, locations exposed to steam or oil vapors, combustible gas, high-frequency waves, acidic solutions, sulfur-based sprays, and excessive vibrations.
Notes:
- Standard Rating: IP21
- To avoid damage, remove the Gland Plate from the DX Coil CONTROLLER before making holes for cable glands.
Ambient Temperature: 0°C to 40°C
Ambient Humidity: Relative humidity 10 ~ 90% (No dew condensation allowed). Fit insulation if dew condensation could form.
Installation Angle: Vertical Installation
7.9 Sensor Connections
Sensor holders MUST be brazed to the DX COIL for reliable temperature sensing. Follow the Dx-coil controller Installation Manual for details.
TC1, TC2, TC and TA sensors (2.5m cable) are combined in the Dx-coil controller. Ensure correct reconnection to the Dx-coil Controller main PCB (MCC-1570) if removed.
- TC1 Sensor (BRN Plug [2 Pin]) > MCC-1570 CN100 (BLOWN Socket [2 Pin])
- TC2 Sensor (BLK Plug [2 Pin]) > MCC-1570 CN101 (BLK Socket [2 Pin])
- TCJ Sensor (RED Plug [2 Pin]) > MCC-1570 CN102 (RED Socket [2 Pin])
- TA Sensor (YEL Plug[2 Pin]) > MCC-1570 CN104 (YEL Socket [2 Pin])
Install cables with a U-bend at sensor ends to prevent water dripping. Sensor cables vinyl tube withstands up to 105°C; keep clear of high temperature parts. Extension cables' connectors are not IP rated; locate within the AHU.
Cable Specification for Extension: VFF, 0.3-0.5 mm2. Available Extend Length: Max. 10m (Total: 12.5m).
TA Sensor position: The TA sensor must be located correctly for TOSHIBA control, not demand control. DDC determines cooling/heating demand.
Example Pictures: Illustrate TA sensor positioning for Fresh Air Only AHU, Outdoor Air (Fresh Air) mixed with Return Air AHU, and Outdoor Air (Fresh Air) mixed with Return Air by Heat Recovery Exchanger.
7.10 Dx-valve KIT Installation
Installation: Avoid direct sunlight. Standard Rating: IP21.
Environment: Insulation should be fitted to Dx-valve kit. Ideally, the Dx-valve kit should be contained within the AHU. If installed outside, a cover should be fitted to protect from wind and rain.
Installation: Assemble supplied components onto the DX COIL using custom locally sourced pipework.
Brazing:
- PMV: Water cool the PMV body and Motor during brazing (keep temperature ≤ 120°C). Flow nitrogen gas through PMV body and pipework to prevent internal oxidation. Prevent cooling water from entering PMV body and connector. Do not damage PMV cables.
- Sensor holders: Fit by brazing. Ensure brazing material does not enter the sensor holder.
Sensor Placement on DX COIL:
- TC1 Sensor: Install in the collecting part of the gas header. Braze at the lowerside 45° to detect stable temperature.
- TC2 Sensor: Install between the liquid pipe distributor and the PMV.
- TCJ Sensor: Install in the pass where the temperature of the capillary tube is lowest.
Cover sensors with heat insulator material and fix with a fixing band if subjected to surrounding thermal effect.
Diagram: Shows the Gas pipe, PMV Pulse Motor Valve, Dx-valve kit, Capillary Tube, Strainer, Heat insulator, Liquid pipe, Distributor, and sensor positions (TC1, TC2, TCJ).
8. Control Outline
8.1 Cautions regard with DDC's programing
(1) Operation Start: Capacity Demand signal should be output after AHU fan operation. Maintain ≥ 50% (Heating: 40%) Capacity Demand for 5 mins. Compressor operates for 5 mins after start even with "Zero" demand signal to protect it.
(2) Freeze prevention control (Low temperature release): If compressor stops due to Freeze prevention control, it will re-start after max 20 mins depending on DX-COIL condition.
(3) Recovery control: Cooling oil recovery duration is 2-5 mins (every 2 hrs). Heating refrigerant recovery duration is 2-10 mins (every 1 hr).
(4) Defrost control (Full Defrost): Defrost terminates based on TE1 & TE2, re-occurs every 55 mins. Defrost operation takes max 10 mins. Heating Recovery operation normally takes place after defrosting.
(5) Compressor restart prevention timer: If compressor stops due to Capacity Demand or protection function (except Freeze prevention), it will stop for 2 mins 30 secs before restarting, even if Capacity Demand signal is received.
8.2 Protection Function Summary
Protection controls vary by Outdoor unit. The following is according to SMMS-e:
| Function | Summary |
|---|---|
| Freeze prevention control (Low temperature release) | Prevents low DX-COIL temperatures by controlling compressor speed (based on TC1/TC2/TCJ sensor temperature). |
| Cooling oil (refrigerant) recovery control | Periodically increases flow-rate to ensure refrigerant oil does not build up in inter-unit gas pipes. During control, compressors operate at target speed, and Dx valve kit PMV is opened. Normal Cooling operation resumes upon completion. |
| Heating refrigerant (oil) recovery control (Heating Start up Control) | Periodically increases flow-rate to ensure liquid refrigerant trapped inside the DX COIL. Recovers DX COIL / Outdoor refrigerant after defrosting and recovers oil during heating overload. During control, compressors operate at target speed, and Dx valve kit PMV is opened. Normal Heating operation resumes upon completion. |
| Defrost control (Full Defrost) | Reduces ice build-up on the Outdoor unit (based on TE1 & TE2 sensor). During Defrosting, the refrigerant cycle is reversed, temporarily cooling the DX COIL. Defrost terminates based on TE1 & TE2, and can re-occur every 55 mins. Dx valve kit PMV is opened to a certain degree. Heating Recovery operation normally takes place after defrosting. |
| High Pressure release control | Staged shutdown of compressors based on PD sensor value and PO limit. Compressor No. 2 shuts down if Pd ≥ P01. Compressor No.1 shuts down if Pd ≥ P02. Compressors restart automatically after 2 mins 30 secs. |
| Case Heater control | Prevents accumulation of refrigerant in compressor and accumulator cases. If power supply is off for a specified period before post-installation test run, compressor failure may occur. Turn on power supply for a while before resuming operation after a long period of no power. |
| A3-IPDU control (Inverter P.C. board for compressor) | 1) Current Release Control: Controls output frequency based on AC input current to prevent inverter input current from exceeding the specified value. 2) Heat sink temperature detection control: Protects IPM from overheating via a thermistor. Can increase outdoor fan speed and shutdown compressors. Stops compressor, which restarts after 2 mins 30 secs. If detection repeats 4 times, unit will not re-start (error code P07). 3) Overcurrent protection: If abnormal current is detected, compressor shuts down. Restarts after 2 min 30 secs, error count recorded. Error count cleared if compressor operates for at least 10 mins. If detection repeats 8 times, error is confirmed. 4) High Pressure SW control: If high pressure switch activates, compressor stops and restarts after 2 mins 30 secs. If detection repeats 4 times, unit will not re-start (error check code: P04). |
9. Cable specifications
A table lists cable specifications for control wiring, remote controller wiring, and digital outputs, including terminal, max. cable length, and cable specification.
10. Interface requirements for controller
10.1 Indoor(DX) P.C board(MCC-1570) function
Details the functions of the Indoor(DX) P.C board (MCC-1570):
- Fan Motor Active Digital Output (D1/D2): Fan control signal, ON during operation, OFF during defrosting.
- Alarm Active Digital Output (D5/D6): Active during Alarm operation.
- Defrost Mode Digital Output (D7/D8): Active during Defrost operation.
- Thermostat On Digital Output (D19/D20): Thermostat ON signal output.
Diagrams illustrate the wiring logic for each output function.
10.2 DDC(0-10V) interface P.C board(TX-TOS1413) Function
Details the functions of the DDC(0-10V) interface P.C board (TX-TOS1413):
- Analogue Input Capacity Demand (A1/A2): SW03_2: STEPPED / LINEAR response. Analogue input 0 to 10V from DDC. Max. 200m.
- Digital Output 1/2 (D31/D32, D33/D34): Output function selected using rotary switches SW1 & SW2.
- Operation Mode Input (Cool / Heat) (C23/C24): If short-circuited, system changes to heat mode. If open, system changes to cool mode. Only cool and heat modes are available. MAX. 100 m.
Diagrams illustrate the wiring logic for each input/output function.
11. Function code (DN code)
A table lists Function CODE (DN code) settings for various parameters, including Filter display delay timer, Dirty state of filter, Specific indoor unit priority, Cooling only mode, Type, Indoor unit capacity, Line address, Indoor unit address, Automatic restart of power failure, Temperature unit select, Timer setting, and Fan trouble input release condition. Default settings are also provided.
12. Dx-coil Controller, Dx-valve kit Dimensions
Dimensional drawings are provided for the RBM-A101VAE, RBM-A201VAE Dx-valve kit and the TCB-IFDDC201E Dx-coil Controller, indicating mounting holes, terminal blocks, and connection ports. Both are designed for indoor installation.
13. Wiring Diagram
A comprehensive wiring diagram illustrates the connections between the Dx-coil controller, MCC-1570, TX-TOS1413, and the Dx-valve kit, including various input and output signals and terminal assignments.
14. Compatibility with Remote Controller, BMS, Open network system
A table details compatibility with various Remote Controllers, BMS systems (LON Interface, Modbus Interface, BACnet IP), Advanced central control (Smart BMS Manager, Touch Screen Controller, Smart device control interface), and Individual gateways (Modbus Interface, KNX Interface). Checkmarks indicate availability, and 'x' indicates prohibition. Some functions are monitoring only.
15. Check Codes
A list of common check codes and their descriptions is provided, including:
- E01: No master remote controller, faulty remote controller communication.
- E09: Duplicated master remote controller.
- E13/E14: Indoor(DX) P.C. board - DDC(0-10V) interface P.C. board communication trouble.
- F01/F02/F03/F10: Sensor trouble (TCJ, TC2, TC1, TA).
- L02: Outdoor units model disagreement trouble.
- L09: Indoor unit Power Code incorrect.
- L22: Incompatible group combination of indoor units.
- L30: Fan Motor operation monitor.
- P10: Safety contact trouble.
16. Related cautions
(1) Installation work: Secure service space for replacement. After AHU controller installation, address and unit capacity settings are necessary. Refer to installation manual. For outdoor unit installation, refer to its manual or data book.
(2) Test run: Turn on main power at least 12 hours before test run to power the crankcase heater. Insufficient powering may result in compressor damage. Ensure analogue input voltage is set to ≥ 4.5V before test run. A remote controller is necessary for initial settings.
(3) Operation control: If an error display appears on the remote controller, do not reset it yourself; contact the service firm or dealer. Refer to data book for system controller usage.
(4) Service: Regular maintenance is required. A maintenance contract is recommended.
17. Warranty
Confirm AHU specifications and compatibility with National / Local regulations. Select an appropriate AHU with specifications matching connected units. Toshiba Carrier is not liable for damage caused by connected AHU with wrong specifications or usage, damage to outdoor units and Dx-coil interface due to AHU damage, or for capacity, responsiveness, and accuracy of the system.
