Installation
4.8 High pressure
transmitter
connection
(Copper oxide could block capillary tubes, thermal
expansion valves and generate damage of
compressor).
Furthermore it is recommended to insulate the
suction pipe up to the compressor inlet.
(Insulation should be at least 19 mm thick and is
not a part of Danfoss supply). Use only dry pipes
and components in order to avoid moisture in the
system.
NOTICE
Maximum test pressure is 28 bar.
NOTICE
Do not open the receiver Rotalock
valve entirely, it must be turned 1 round (360°) to
the closed direction to provide system pressure to
the transmitter!
1. Valve In (from receiver).
2. Valve Out (to evaporator).
3. Service port (for safety devices).
4. Service port (for transmitter or service only).
A) Valve fully closed (Valve spindle entirely turned
clockwise).
• 1, 3 and 4 connected.
• 2 has no connection the other ports.
B) Valve opened some turns (Valve spindle
somewhere between open and close).
• 1, 2, 3 and 4 connected.
C) Valve entirely opened (Valve spindle entirely
turned counterclockwise).
• 1, 2 and 3.
• 4 has no connection the other ports.
Normal operation: Valve spindle shall not be
entirely opened (1 turn back), so that pressure
transmitter gets its pressure.
Transmitter failure: Valve shall be opened entirely
to disconnect transmitter port from the others.
25
FRCC.PC.044.A6.02
Application Guidelines
