Danfoss 020R5421 Type OFC Check and Stop Valve Installation Guide

Quick guide from the manual

The Danfoss Type OFC Check and Stop Valve is designed for oil-free environments, specifically for use with Danfoss Turbocor compressors. The valve must be installed in a vertical down orientation as delivered. If other orientations are required, the internal check valve spring must be replaced with the color-coded spring corresponding to the specific angle.

Technical Specifications

• Refrigerants: UL listed for R134a, R513A, R515B; CE approved for fluid group 2, including R1234ze(E).
• Media Temperature: Min 0°C / 32°F; Max 90°C / 194°F (short term up to 100°C / 212°F).
• Max Working Pressure: 23 bar / 334 psig.
• Environment: Oil-free.

Installation

Install the valve directly on the Danfoss Turbocor compressor. Protect the valve from impact during installation. All fasteners and bolts must be stainless steel with a minimum class of A2-70.

• Staging Port: Bolt size M10x1.5, Torque 38 Nm ± 4 Nm.
• Outlet Flange Fasteners: Torque 110 Nm.
• Brazing: Place outer flange on evenly cut copper pipe. Ensure the flange is not mounted on the main housing during brazing. Use minimum 5% Ag.

Orientation and Spring Configuration

The valve is delivered with a blue spring for vertical down installation. If the orientation is changed, the spring must be replaced:

• Vertical down: Blue spring (as delivered).
• 45° down: Yellow spring.
• Horizontal: Red spring.
• 45° up / Vertical up: Not allowed.

Maintenance: Changing the Check Valve Spring

1. Remove the check valve insert from the main housing.
2. Remove the check valve head.
3. Remove the spring and replace it with the correct color based on the intended orientation.
4. Replace the check valve head and insert.
5. Install the outlet flange, O-ring, and fasteners.

Note: Always apply provided lubrication to the O-ring. Use silicone lubricant spray at the O-ring if needed. For check and stop valves, always replace the lock ring and cap after opening/closing the ball valve.