Pioneer DYC-18 Series Installation And Owner's Manual
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Pioneer DYC-18 Series Installation And Owner's Manual

Pioneer DYC-18 Series Installation And Owner's Manual

Ducted central split system air conditioner / heat pump inverter outdoor unit for 24,000-60,000 btu/hr systems
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DUCTED CENTRAL SPLIT SYSTEM AIR CONDITIONER / HEAT PUMP
DYC-18 Inverter Series
For 24,000-60,000 BTU/hr Systems
Condensing Unit (R-454B) - YD Outdoor (2/3 Ton & 4/5 Ton)
Models:
-YD2436GCSI18RD
-YD4860GCSI18RD
Installation and
Owner's Manual
IMPORTANT NOTICE:
Please read this manual carefully before installing
or operating your new air conditioning system.
Be sure to save this manual for future reference.
REV250529
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Summary of Contents for Pioneer DYC-18 Series

  • Page 1 DUCTED CENTRAL SPLIT SYSTEM AIR CONDITIONER / HEAT PUMP DYC-18 Inverter Series For 24,000-60,000 BTU/hr Systems Condensing Unit (R-454B) - YD Outdoor (2/3 Ton & 4/5 Ton) Models: -YD2436GCSI18RD -YD4860GCSI18RD Installation and Owner’s Manual IMPORTANT NOTICE: Please read this manual carefully before installing or operating your new air conditioning system.

  • Page 2: Table Of Contents

    CONTENTS 1. Safety Symbols and Instructions ...............1 2. Considerations of Unit Location .................9 3. Unit Installation Preparation ................14 4. Unit Settings ....................15 5. Precautions for Refrigerant Pipeline..............16 6. Refrigerant Pipeline Routing ................18 7. Refrigerant Line Brazing.................. 20 8.

  • Page 3: Safety Symbols And Instructions

    1. Symbol and Key to Safety Instructions 1.1 Symbol Keywords The warnings in this document are identified by warning triangles printed on a black background. The key words at the beginning of the WARNING warning indicate the type and severity of the next risk if no measures are taken to prevent it.
  • Page 4 Some benefits of installing an approved indoor and outdoor split system are maximum efficiency, best performance and best overall system reliability. This document contains wiring diagram and maintenance information. This is the customer's property and belongs to this unit. When you are finished, please return to the service information package.
  • Page 5 Warning: Refrigerant oil ● Attempting to repair central air-conditioning products may result in property damage, serious personal injury or death. These units use R-454B refrigerant, and its working pressure is 50-70% higher than R-22. Use only the service equipment approved by R-454B. The refriger- ant cylinder is painted "rose"...
  • Page 6 Warning: Brazing required ● Failure to check the wiring or use the correct maintenance tools may result in equipment damage or personal injury. If using existing refrigerant lines, make sure that all joints are brazed, not soldered. Warning: High current leakage ●...
  • Page 7 Qualification of workers Every working procedure like maintenance, service and repair operations that affects safety means shall only be carried out by competent persons. Examples for such working procedures are: • Breaking into the refrigerating circuit; • Opening of sealed components; •...
  • Page 8 – the actual REFRIGERANT CHARGE is in accordance with the room size within which the refrigerant containing parts are installed; – the ventilation machinery and outlets are operating adequately and are not obstructed; – if an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the pres- ence of refrigerant –...
  • Page 9 If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak. Removal of refrigerant shall be according to Removal and evacuation. Removal and evacuation When breaking into the refrigerant circuit to make repairs –...
  • Page 10 a) Become familiar with the equipment and its operation. b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; •...

  • Page 11: Considerations Of Unit Location

    2. Considerations of Unit Location 2.1 Unit Size Table 2.1 Outdoor Operating Temperature Model Temperature Cooling mode 5-125℉ Heating -4-86℉ Table 2.2 Unit size Model W x D x H (inches) 24/36K 29-1/2 x 29-1/2 x 25 48/60K 29-1/2 x 29-1/2 x 32-7/8 The weight of the unit is also printed on the carton.
  • Page 12 Maximum equivalent length of pipeline = 100 feet. Maximum vertical equivalent length = 50 feet. Use only the pipe diameters shown in Table 2.3. If the suction line exceeds 65 feet, do not use a larger suction line than recommended. Standard Lineset Lineset 100' Max Line Length...
  • Page 13 2.3 Long Line Installation Precautions ● Note that the length of the connecting line from the outdoor unit to the indoor unit cannot exceed 100 feet. ● If all long lines are in a horizontal state, no additional measures are required; ●...
  • Page 14 Avoid Installations Near Bedrooms Min.60″ Unrestricted Min.12″ to Min.24″ Shrubbery Unrestricted Access Panel Figure 2.3 Min.12″ to Min.24″ to Shrubbery Shrubbery Access Panel Figure 2.4 Precautions in cold climate (heat pump only) Precautions must be taken for units installed in areas with snow and long-term temperatures below freezing point.
  • Page 15 ● Depending on the local weather conditions, the unit should be raised by 3-12 inches. This extra height will allow the snow and ice melted during the defrosting cycle to be discharged before re-freezing. Make sure that the drain hole on the unit chassis is not blocked, otherwise it will hinder the defrosting water discharge (Figure 2.5).

  • Page 16: Unit Installation Preparation

    3. Unit Installation Preparation 3.1 Prepare the Unit for Installation ● Check whether there is any damage and report any damage to the unit to the courier (Figure 3.1). ● The service port can be used to ensure that the refrigerant charge is uncompromised during shipment. Figure 3.1...

  • Page 17: Pad Installation

    4. Unit Settings 4.1 Pad Installation When installing the unit on a support pad (such as a concrete slab), please consider the following: ● All sides of the pad must be at least 1-2 inches larger than the unit. ● The pad must be separated from any structure. ●...

  • Page 18: Precautions For Refrigerant Pipeline

    5. Precautions for Refrigerant Pipeline 5.1 Connecting Dimensions of Refrigerant Lines and Service Valves Table 5.1 Suction line Liquid line Suction line Liquid line connection connection Model The dimensions are in inches. 24K/36K 48K/60K 5.2 Required Refrigerant Line Length Determine the required pipeline length (Figure 5.1). Please refer to Section 2.2. Line Length Figure 5.1 5.3 Refrigerant Pipe Insulation...
  • Page 19 Suction Line Liquid Line Insulation Figure 5.2 5.4 Reuse the Existing Refrigerant Lines Note: Mild to moderate burns ● If using existing refrigerant lines, make sure that all joints are brazed, not soldered. The following precautions should be taken for the retrofit application that will use the existing refrigerant pipeline: ●...

  • Page 20: Refrigerant Pipeline Routing

    6. Refrigerant Pipeline Routing 6.1 Preventive Measure Take preventive measures to prevent noise generated by vibration transmission of refrigerant line in building structure. For example: ● When the refrigerant line must be fixed on floor joists or other frames in the structure, use isolated hangers.
  • Page 21 Wall Sealant Ductwork Insulate Suction line Sound dampener Lineset Do not hang the lineset on the duct work. Wall isolation Figure 6.3 To indoor coil To outdoor unit Insulated suction line Liquid line PVC conduit Figure 6.4...

  • Page 22: Refrigerant Line Brazing

    7. Refrigerant Line Brazing 7.1 Brazed Refrigerant Pipeline 1. Remove the cover or plug. Use the deburring tool to deburr the line end. Clean the inner and outer surfaces of the pipeline with emery cloth. Figure 7.1 2. Remove the pressure taps from the two service valves. Figure 7.2 3.
  • Page 23 All units are recommended to have a bidirectional filter driver installed. Braze the filter drier to the liquid line, taking care not to push the refrigerant line too hard through the stopper in the filter drier (this may damage the filter). Continue the dry nitrogen purge.

  • Page 24: Refrigerant Line Leakage Inspection

    8. Refrigerant Line Leakage Inspection 8.1 Check for Leaks 1. Use dry nitrogen to pressurize the refrigerant line and evaporator coil to 250 PSIG*. 250 PSIG* Figure 8.1 2. Use soapy water or bubbles at each brazing position to check for leaks. Figure 8.2 *Note：...

  • Page 25: Vacuuming

    9. Vacuuming 9.1 Drain Refrigerant Lines and Indoor Coils Do not open the service valve until the leakage inspection and vacuuming of refrigerant lines and indoor coils are completed. 1. Evacuate until the micron gauge reads no higher than 350 microns, then close the valve to the vacuum pump.

  • Page 26: Service Valve

    10. Service Valve 10.1 Open the Service Valve Warning: Moderate to severe burns ● When opening the liquid line service valve, be extra careful. Turn counterclockwise until the valve stem just touches the hem. No torque is required. Failure to observe this warning will result in sudden release of system pressure, and may result in personal injury and/or proper- ty damage.

  • Page 27: Electrical-Low Voltage

    11. Electrical-Low Voltage 11.1 Low Voltage Connection Diagram Control Board Access Panel 24V Low Voltage Connection 485 Communication Low Voltage Connection Figure 11.1 Connection of Low Voltage Device Temperature + Setting Mode Temperature - Fan AUTO/ON Power Figure 11.2 Button definition of manufacturer's RS485 communicative thermostat...
  • Page 28 11.2 Wiring Diagram of Thermostat ● Ensure that the power supply is consistent with the nameplate of the unit. ● The power connection and grounding of the unit must comply with local regulations. ● Low voltage wiring to be No. 22 AWG minimum conductor. ●...
  • Page 29 Wiring for 4H and 2C thermostat Water Float Switch H/DH THERMOSTAT Note: Any time the electric heat elements are active, the indoor INDOOR UNIT OUTDOOR UNIT fan will run in high stage. Figure 11.4 Control Wiring for Heat Pump Systems Wiring for 3H and 1C thermostat Water Float Switch...

  • Page 30: Electrical-High Voltage

    Wiring for 1H and 1C thermostat Water Float Switch H/DH THERMOSTAT Note: Because Y1 and Y2 are jumped, the indoor fan INDOOR UNIT OUTDOOR UNIT will only run in high stage. Figure 11.7 Control Wiring for Heat Pump Systems Wiring for 2H and 1C thermostat Water Float Switch H/DH...
  • Page 31 Follow the instructions of the unit wiring diagram located at the back side of control box access panel, and refer to the wiring diagram in this installation manual. 12.2 High Voltage Disconnect Switch Install a separate disconnect switch on the outdoor unit. High-voltage wiring must use flexible electrical conduit supplied on site.

  • Page 32: System Start-Up

    13. Start 13.1 System Startup 1. Make sure that Step 7, 8, 9, 10, 11 and 12 have been completed. 2. Set the system thermostat to off. Figure 13.1 3. Turn on the disconnect switch and apply power to indoor unit and outdoor unit. Figure 13.2 4.

  • Page 33: System Refrigerant Charging Method

    14. System Refrigerant Charging Method 14.1 Refrigerant Charging: Weigh-In Method Use weigh-in method the initial installation, or anytime a system charge is being replaced. Weigh-in method can also be used when power is not available to the equipment site or operating conditions (indoor/outdoor temperatures) are not in range to verify with the subcooling charging method.
  • Page 34 ①= (oz) ② ① ②= (oz) ①+②= (oz) ① REFRIGERANT CHARGE of the precharged part of the appliance ② REFRIGERANT CHARGE added during installation 14.2 Subcooling Charging and Refrigerant Adjustment in Cooling Mode 1. Check the outdoor ambient temperature. Subcooling (cooling mode) is the only recommended charging method when the outdoor ambient temperature is higher than 68°F.
  • Page 35 Wait for the system to stabilize, for twenty (20) minutes after “forced cooling” mode has started. Compressor will maintain a specific frequency in “forced cooling” mode. First determine then optimum subcooling value, based on measured liquid line temperature and pressure, according to Table 14.2. If calculated subcooling value is lower than the recommended design subcooling value shown in Table 14.3, refrigerant should be added.

  • Page 36: System Operation And Troubleshooting

    15. System Operation and Troubleshooting 15.1 Control Logic Description ● The Inverter system adopts the same 24VAC control as any conventional heat pump. ● The compressor’s speed is controlled based on coil pressures monitored by the unit's pressure trans- ducer. To ensure stable and adequate capacity, the compressor speed will modulate relative to evapo- rator pressure during cooling operation and relative to condensing pressure during heating operation.
  • Page 37 15.4 Defrost Description Automatic Defrost Control Function. The function monitors outdoor coil temperature (T3) and the ambient temperature(T4) to determine whether to defrost or not. One of the following conditions should be met to run a defrost cycle: 1. The difference between the outdoor ambient temperature(T4) and the outdoor coil temperature (T3) is called Delta T.
  • Page 38 Manual Defrost. Press and hold the button “▼” on the display board till the symbol “dF” shows (“dF” and the compressor frequency will be displayed alternately). The unit must have been operating in heating mode for at least 5 minutes. Defrost will terminate automatically, after which the display board will show the compressor speed (Hz).
  • Page 39 ● Exhaust temperature protection (T5) 1. In cooling or heating mode, if the temperature is higher than the set maximum value, the system will stop for protection. 2. In cooling or heating mode, if the temperature is lower than the set recovery temperature, the system will restart.
  • Page 40 T5 exhaust temp sensor high temp protection T3 condenser sensor high temp protection(In cooling mode) IPM protection T2 freeze protection IPM high temperature protection (Tf) DC fan motor error Wet operation error High pressure abnormal error(In heating mode) Communication fault of master board and driver chip T3 sensor high temperature error(In cooling mode) (3 times P5 error within 180mins) High pressure switch error(3 times P1 error within 150 mins) High pressure abnormal in heating mode (3 times PD error within 180 mins)
  • Page 41 15.9 SW1 DIP SWITCH Description The dip switch SW1-1 is set to OFF, the unit should be controlled by a 24V thermostat. For RS485 communication mode, set SW1-1 to ON. The RS485 communication mode is only valid on the manufac- turer approved match indoor unit, outdoor system and manufacturer supplied RS485 communicative thermostat which is optional.

  • Page 42: Parameter Point Check Table

    15.10 Parameter Point Check Table ● To display system parameters, press the "CHK"(K4) button to run through the series of parameters available. The first time you press the "CHK" button, it will display the NUM of parameter, and after 1 second it will display the value of the parameter.
  • Page 43 15.11 Overview of Main Control Board Outdoor Main Control Board Functional description Power supply input L(L1) Power supply input N(L2) Ground wire Crankshaft heating port Four-way valve port Solenoid Valve port Display board ports Electronic expansion valve port T3 T4 TP sensor port High pressure protection switch port Pressure sensor port DC motor port...
  • Page 44 Functional description Power supply input L(L1) Power supply input N(L2) Ground wire Crankshaft heating port Four-way valve port Solenoid Valve port Display board ports Electronic expansion valve port T3 T4 TP sensor port High pressure protection switch port Pressure sensor port DC motor port Compressor port U V W Figure 15.2 3P Outdoor Main Control Board...
  • Page 45 F4(T4 Outdoor ambient temp sensor failure) F6(T3 Condenser temp sensor failure) T4 sensor position T3 sensor position Corrected position Corrected position is wrong. is wrong. Please refer to Please refer to T4 sensor wiring T3 sensor wiring the wiring diagram for the wiring diagram for is correct? is correct?
  • Page 46 F9 (Undervoltage on primary side) FA (Outdoor EEPROM failure) Check item 13. Is the converted E-chip virtual welding? Weld well System normal value higher or protection. Check the lower than the power supply system limit value? Refresh the data of EEPROM data (Communicate EEPROM and restart...
  • Page 47 PC/H7 (wet operation abnormal protection) H6/P4(T5 Exhaust high temperature abnormal protection) The pressure sensor is Reconnect the System normal protection not connected properly. pressure sensor. Check whether the Figure 15.17 pressure sensor is Replace pressure disconnected. Is the sensor. measurable total resistance infinite? P3 (Overcurrent protection of primary side or secondary side)
  • Page 48 15.13 Temperature-Resistance Relationship Table (For Sensors) Table 15.3 for T3, T4, T7 Electric Electric Temperature F Temperature C Volt DC Temperature F Temperature C Volt DC resistance kΩ resistance kΩ -20.6 33.367 0.57 32.2 3.865 2.63 -17.8 29.227 0.64 35.0 3.508 2.75 -15.0...

  • Page 49: Wiring Diagram

    16 Wiring Diagram 802035000124 Outdoor Display Board RS-485 communication (DISP) Pressure Sensors CN10 (HP) CN106 Outdoor coil temp (T3) Outdoor ambient temp (T4) Exhaust temp (TP/T5) Outdoor T7 condensing temp CN21 COMP1(U) CN31 YE/GN COMP2(V) (EXV) COMP3(W) CN60 4-WAY (4-WAY) CN14 (HEATY) Motor...
  • Page 50 802035000194 Outdoor Display Board RS-485 communication (DISP) Pressure Sensors CN10 (HP) CN106 Outdoor coil temp (T3) Outdoor ambient temp (T4) Exhaust temp (TP/T5) Outdoor T7 condensing temp CN21 COMP1(U) CN31 YE/GN COMP2(V) (EXV) COMP3(W) CN14 (HEATY) Motor (DC-FAN) CN17 (SV2) YE/GN CN1(N) CN2(L)

  • Page 51: Cleaning And Maintenance

    17 Cleaning and Maintenance 17.1 Cleaning Precautions Warning: ● Any maintenance and cleaning of outdoor units can only be carried out by qualified maintenance personnel. ● Any unit maintenance can only be carried out by qualified maintenance personnel. Caution: Electric shock ●...

  • Page 52: Water Float Switch Wiring

    18 Water Float Switch Wiring 18.1 RS485 Communication Mode The indoor and outdoor units connect to three communication lines P.Q.E. The water float switch needs to be connected between the P of the communication line, that is, the communication line of the terminal P of the indoor unit first passes through the water float switch and then to the terminal P of the outdoor unit.

  • Page 53: Rs485 Wiring And Thermostat

    19 RS485 Wiring and Thermostat 19.1 RS485 Communication Wiring 1. Set the dial switch of the indoor and outdoor units to RS485 communication mode. The SW1-1 dial switch on the indoor mainboard and the SW1-1 dial switch on the ODU display board should both be turned to the “ON” position Indoor unit RS-485 communication mode SW1-1...
  • Page 54 2. Connect RS485 communication wire Connect the indoor and outdoor units, P-P, Q-Q, E-E one by one, using 2-core shielded wires, with the shielding layer of the cable connected to E NOTE: The wired controller communication cable is provided by the factory, and the PQE communication cables for the IDU and ODU need to be purchased by the customer in the local market 2.

  • Page 55: Disposal Guidelines

    20 Product Disposal Guidelines This appliance contains refrigerant and other potentially hazar dous materials. When disposing of this appliance, the law requires special collection and treatment. Do not dispose of this product as household waste or unsorted municipal waste. All refrigerant and oil must be removed prior to disposal as outlined within this manual. When disposing of this appliance, you have the following options: •...
  • Page 56 7290 NW 77 Court, Miami, FL 33166 - USA : (305) 513-4488 : (305) 513-4499 E-mail : info@pdhvac.com Website: www.pdhvac.com Pioneer product line, parts, and supplies are available online for convenient ordering at: www.highseer.com www.pioneerminisplit.com Scan the below code to visit our support page where you can find more installation materials: Copyright 2025, Parker Davis HVAC International, LLC., All rights reserved.

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