York YCAS Series, Installation Operation & Maintenance

Page: 31 / 216

31 YORK INTERNATIONAL
FORM 201.19-NM8 (804)
4
Option Flanges
One of two types of fl anges may be fi tted depending on
the customer or local Pressure Vessel Code re quire ments.
These are Victaulic-Adapter fl anges, normally supplied
loose, or weld fl anges which may be supplied loose or
ready fi tted. Victaulic-Adapter and weld fl ange dimen-
sions are to ISO 7005 - NP10.
REFRIGERANT RELIEF VALVE PIPING
Evaporators and oil separators are each protected
against internal refrigerant overpressure by refrigerant
relief valves. For evaporators, a pressure relief valve is
mounted on each of the main refrigerant lines connecting
the evaporator to the compressors.
It is recommended that a piece of pipe is fi tted to each
valve and directed so that if the valve is activated, the
release of high pressure gas and liquid cannot be a dan ger
or cause injury. For indoor installations pres sure re lief
valves should be piped to the exterior of the build ing.
The size of any pipework attached to a relief valve must
be of suffi cient diameter so as not to cause resistance to
the operation of the valve. Unless otherwise spec i fi ed
by local regulations, internal diameter de pends on the
length of pipe required and is given by the fol low ing
formula:
D 5 = 1.447 x L
Where:
D = minimum pipe internal diameter in cm
L = length of pipe in meters
If relief pipework is common to more than one valve its
cross sectional area must be at least the total re quired
by each valve. Valve types should not be mixed on a
common pipe. Precautions should be taken to ensure
that the outlet of relief valves/vent pipe remain clear of
ob struc tions at all times.
DUCTWORK CONNECTION
General Requirements
The following ductwork rec om men da tions are in tend ed
to ensure sat is fac to ry op er a tion of the unit. Failure to
follow these rec om men da tions could cause damage to
the unit, or loss of per for mance, and may invalidate the
warranty.
When ducting is to be fi tted to the fan discharge it is
recommended that the duct should be the same cross sec-
tional area as the fan outlet and straight for at least three
feet (1 meter) to obtain static regain from the fan.
Ductwork should be suspended with fl exible hangers
to prevent noise and vibration being transmitted to the
struc ture. A fl exible joint is also recommended be tween
the duct attached to the fan and the next section for the
same reason. Flexible connectors should not be al lowed
to concertina.
The unit is not designed to take structural loading. No
signifi cant amount of weight should be allowed to rest
on the fan outlet fl ange, deck assemblies or condenser
coil module. No more than 3 feet (1 meter) of light
con struc tion ductwork should be supported by the unit.
Where cross winds may occur, any ductwork must be
sup port ed to prevent side loading on the unit.
PIPEWORK ARRANGEMENT
Fig. 6 shows the following is a suggested pipework ar-
rangement for single unit in stal la tions. For mul ti ple unit
installations, each unit should be piped as shown.
CONNECTION TYPES & SIZES
For connection sizes relevant to individual models re fer
to the Technical Data Section.
EVAPORATOR CONNECTIONS
Standard chilled liquid connections on all evaporators
are of the Victaulic Groove type.
LD03521
FIG. 7 –
VICTAULIC GROOVE
Weld Flange Victaulic Adapter
LD03523
FIG. 8 –
FLANGE ATTACHMENTS