This document is an Installation & Maintenance Manual for Hitachi's INVERTER-DRIVEN MULTI-SPLIT SYSTEM HEAT PUMP AIR CONDITIONERS, specifically the SET-FREE SERIES - IN-THE-CEILING (DUCT) models. The manual covers models RPI-3.0FSN2SQ, RPI-4.0FSN2SQ, RPI-5.0FSN2SQ, RPI-6.0FSN2SQ, and RPI-7.0FSN2SQ.
Function Description
The device is an inverter-driven multi-split system heat pump air conditioner designed for in-the-ceiling (duct) installation. It provides both cooling and heating functions for standard air conditioning purposes. The system utilizes R410A refrigerant and is designed for efficient operation within specified temperature ranges.
Important Technical Specifications
Models Covered:
- RPI-3.0FSN2SQ
- RPI-4.0FSN2SQ
- RPI-5.0FSN2SQ
- RPI-6.0FSN2SQ
- RPI-7.0FSN2SQ
Dimensions (Unit: mm):
- RPI-3.0FSN2SQ - RPI-6.0FSN2SQ:
- L1 (Length): 1076 mm (for 3.0-4.0HP), 1300 mm (for 5.0-6.0HP)
- L2 (Width): 879 mm (for 3.0-4.0HP), 1000 mm (for 5.0-6.0HP)
- Height: Approximately 350 mm
- Depth: Approximately 800 mm
- RPI-7.0FSN2SQ:
- Length: 1430 mm
- Width: 440 mm
- Height: Approximately 550 mm
Operating Temperature Range (°C):
- Cooling Operation:
- Indoor: 21 DB/15 WB (Minimum) to 32 DB/23 WB (Maximum)
- Outdoor: -5 DB* (Minimum) to 46 DB (Maximum)
- Heating Operation:
- Indoor: 15 DB (Minimum) to 27 DB (Maximum)
- Outdoor: -20 WB* (Minimum) to 15 WB* (Maximum)
- *Temperature may change depending on the outdoor unit.
Refrigerant:
- Type: R410A (non-flammable, non-toxic, odorless)
- Refrigerant Gas Pipe Connection:
- RPI-3.0FSN2SQ to RPI-6.0FSN2SQ: Ø15.88 (5/8) or Ø19.05 (3/4)*
- RPI-7.0FSN2SQ: Ø15.88 (5/8)
- Refrigerant Liquid Pipe Connection: Ø9.52 (3/8) for all models.
- *If Ø19.05 is used, a field-supplied reducer is required for indoor unit connection.
Drain Piping:
- Connection: Ø32mm outer diameter polyvinyl chloride pipe.
- Pitch: 1/25 to 1/100 DOWN-SLOPE.
Electrical Specifications:
- Power Source: 240V/1Ø/50Hz
- Maximum Current:
- RPI-3.0FSN2SQ to RPI-6.0FSN2SQ: 5A
- RPI-7.0FSN2SQ: 7A
- Power Source Cable Size (IEC 60335-1 *1 / MLFC *2):
- RPI-3.0FSN2SQ to RPI-6.0FSN2SQ: 0.75mm² / 0.5mm²
- RPI-7.0FSN2SQ: 1mm² / 0.5mm²
- Transmitting Cable Size (IEC 60335-1 *1 / MLFC *2):
- RPI-3.0FSN2SQ to RPI-6.0FSN2SQ: 0.75mm² / 0.5mm²
- RPI-7.0FSN2SQ: 1mm² / 0.5mm²
- Control Circuit Fuse Capacity: 5A
Safety and Control Devices:
- Evaporator Fan Motor Thermostat:
- Cut-Out: 135 ±5 °C (RPI-3.0 to RPI-6.0), 140 ±5 °C (RPI-7.0)
- Cut-In: 86 ±15 °C (all models)
- Freeze Protection Thermostat:
- Cut-Out: 0 °C
- Cut-In: 11 °C
- Thermostat Differential: 2 °C
- Float Switch: Prevents water leakage from the drain pan.
- Earth Leakage Breaker (ELB): Recommended for safety.
External Static Pressure Settings:
- RPI-3.0FSN2SQ, RPI-4.0FSN2SQ: 70Pa (Standard: 00)
- RPI-5.0FSN2SQ, RPI-6.0FSN2SQ: 120Pa (High Static Pressure: 01)
- RPI-7.0FSN2SQ: 140Pa (High Static Pressure: 01)
Undamped Natural Frequency (Duct Connection):
- 3.0HP: 12 to 23 Hz
- 4.0HP: 11 to 22 Hz
- 5.0HP, 6.0HP: 11 to 23 Hz
- 7.0HP: 12 to 20 Hz
Usage Features
- Inverter-Driven Multi-Split System: Allows for precise temperature control and energy efficiency.
- In-the-Ceiling (Duct) Installation: Designed for concealed installation within false ceilings, providing discreet air distribution through ducts.
- Flexible Installation: Models RPI-3.0FSN2SQ to RPI-6.0FSN2SQ can be separated into fan and heat exchanger compartments for easier installation in confined spaces.
- External Static Pressure Adjustment: The air flow volume can be adjusted by setting the external static pressure via the remote control switch, allowing customization for different duct designs.
- Remote Control Compatibility: Designed to connect with a remote control switch (e.g., PC-ARF) for operation.
- Safety Features: Equipped with a float switch for drain pan overflow protection and various thermostats for motor and freeze protection.
- Electromagnetic Wave Considerations: Specific installation guidelines are provided to minimize interference from medical equipment or other strong electromagnetic wave radiators.
- Oil Heater: The system includes an oil heater that requires 12 hours of energization before startup after a long shutdown.
Maintenance Features
- Service Access Door: Requires a service access door (Min. 450x450mm) for maintenance, especially if the ceiling board cannot be detected for servicing.
- Easy Disassembly (for 3.0-6.0HP models): The indoor unit can be separated into fan and heat exchanger compartments for easier maintenance or installation, with clear instructions for removal and reassembly of components like the fan cover and fan assembly.
- Drainage Check: After installation, a procedure is outlined to check for smooth water flow in the drain piping by pouring water into the drain pan.
- Electrical Wiring Diagram: Detailed diagrams are provided for electrical connections, including transformer wiring and terminal board connections, facilitating troubleshooting and maintenance.
- Dip Switch Settings: Instructions for setting various dip switches (Unit No., Refrigerant Cycle No., Capacity Code, Fuse Recover) are provided, which are crucial for proper unit operation and system configuration.
- Pre-Startup Checks: A comprehensive list of checks is provided before test run, including electrical resistance, stop valve positions, and compressor oil warming (crankcase heater), ensuring safe and correct operation.
- Shielded Cables: The use of shielded wires for operation and remote control lines is specified to prevent interference and ensure reliable communication.
- Regular Inspections: The manual emphasizes periodic checks of electrical wiring and components.
- Component Identification: Detailed diagrams and tables identify key components like fan, fan motor, heat exchanger, electrical control box, and piping connections, aiding in maintenance and part replacement.
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