Seeley International Pty Ltd

NCHS-D - Mode Exchange (Branch Box) Installation Manual - NCHSD-01-A Installation Manual Mode Exchange Box

40-page Pdf attached 

 Installing the NCHSD Mode Exchange Box (VRF Accessory)

Overview

The Mode Exchange Box is a key component in a VRF Heat Recovery system, allowing simultaneous heating and cooling in different zones. It acts as a refrigerant distributor, intelligently routing refrigerant between indoor and outdoor units.

Safety Notices

Before installation:

• Only qualified technicians should install this unit.
• Ensure proper grounding and power supply (220–240V ~50/60Hz).
• Do not install in bedrooms, meeting rooms, or areas sensitive to noise.
• Avoid corrosive environments and ensure proper drainage.

Product Models & Capacity

Only compatible with VRF Heat Recovery units (MCRX*D3B)

Installation Steps

1. Preparation

• Use provided accessories (nuts, washers, silencers, cable ties, etc.).
• Choose a location with good ventilation and minimal noise impact.
• Ensure structural support for hanging the unit.

2. Mounting

• Use the installation template to drill holes.
• Suspend the unit using M10 bolts and washers.
• Ensure the unit is level and slightly slanted for drainage.

3. Pipe Connections

• Follow welding instructions carefully.
• Use nitrogen during welding to prevent oxidation.
• Insulate all pipes properly to prevent condensation.

4. Drainage Setup

• Use PVC pipes with a 1–2% downward slope.
• Install traps and support brackets every 1–1.5 meters.
• Test drainage with 1L of water before sealing.

5. Electrical & Communication Wiring

• Connect power to terminals L, N, and ground.
• Use shielded twisted pair wires for communication.
• Add matched resistance on the last Mode Exchange Box for reliable communication.

Routine Maintenance

• Clean with a soft cloth and neutral detergent.
• Check filters, wiring, and grounding before seasonal use.
• Run fan mode before storage to dry internal components.

Troubleshooting Tips