Refrigerant Relief Valve Piping; Electrical Connection; Figure 15 - Flange For Gb Vessels; Figure 16 - Flange Attachment - York YVAA Installation Operation & Maintenance

SECTION 4 - INSTALLATION
4 in. / 6 in. / 8 in. flange

Figure 15 - Flange for GB vessels

Option flanges
One of two types of flanges may be fitted depending
on the customer or local pressure vessel code require-
ments. These are grooved adapter flanges, normally
supplied loose, or weld flanges, which may be supplied
loose or ready-fitted. Grooved adapter and weld flange
dimensions are to ISO 7005 - NP10.
Weld flange

Figure 16 - Flange attachment

Refrigerant relief valve piping

The evaporator is protected against internal refrigerant
overpressure by refrigerant relief valves. A pressure re-
lief valve is mounted on each of the main refrigerant
lines connecting the evaporator to the compressors.
For indoor installations, pressure relief valves must be
piped to the exterior of the building. Indoor installa-
tions are not recommended.
36
Grooved adapter
LD10495
10 in. flange
The size of any piping attached to a relief valve must
be of sufficient diameter so as not to cause resistance to
the operation of the valve. Unless otherwise specified
by local regulations. Internal diameter depends on the
length of pipe required and is given by the following
formula:
D = 1.447 x L
5
Where:
• D = minimum pipe internal diameter in cm
• L = length of pipe in meters
If relief piping is common to more than one valve, its
cross-sectional area must be at least the total required
by each valve. Valve types should not be mixed on a
common pipe. Precautions should be taken to ensure
the outlets of relief valves or relief valve vent pipes
remain clear of obstructions at all times.

Electrical connection

The following connection recommendations are in-
tended to ensure safe and satisfactory operation of the
unit. Failure to follow these recommendations could
cause harm to persons or damage the unit, and may
invalidate the warranty.
No additional controls (relays, and so on)
must be mounted in the control panel.
Power and control wiring not connected
to the control panel must not be run
through the control panel. If these pre-
cautions are not followed it could lead
to a risk of electrocution. In addition,
electrical noise may cause malfunctions
or damage the unit and its controls.
Form 201.47-ICOM1
Issue date: 17/11/2022
LD16185a
JOHNSON CONTROLS