York YVWA, Installation Operation & Maintenance

Page: 55 / 156

JOHNSON CONTROLS
55
SECTION 3 - HANDLING, STORAGE, INSTALLATION AND REASSEMBLY
FORM 201.30-ICOM1 (519)
ISSUE DATE: 05/22/2019
3
FIGURE 34 - LEAVING WATER TEMPERATURE
OUT-OF-RANGE SUGGESTED
LAYOUT
LD17279
Supply
to
Load
Return
from
Load
Recirculation
VARIABLE PRIMARY FLOW
Johnson Controls recommends a maximum 10% per
minute flow rate of change, based on design flow, for
variable primary flow applications. Provide 8-10 gal-
lons per chiller ton (8.6-10.8 liter per cooling KW)
system water volume. Insufficient system volume and
rapid flow changes can cause control problems or chill-
er shutdowns. There are many other design issues to
evaluate with variable primary flow systems. Consult
the Johnson Controls Sales Office for more informa-
tion about successfully applying YVWA chillers.
NOZZLE CONNECTIONS
Standard chilled liquid connections on all coolers and
condensers are the victaulic groove type as shown in
Figure 35 - Victaulic Groove on page 55.
FIGURE 35 - VICTAULIC GROOVE
LD10494
OPTIONS FOR FLANGES
Two types of flanges may be fitted, depending on the
customer or local pressure vessel code requirements as
shown in
Figure 36 on page 55
. Weld flanges are
supplied loose or ready-fitted; victaulic adapters are
supplied loose.
The flange dimensions are to ISO 7005 - NP10.
WELD FLANGE
VICTAULIC ADAPTER
LD10495
FIGURE 36 - FLANGE ATTACHMENT
WELD
FLANGE
VICTAULIC
ADAPTER
REFRIGERANT RELIEF PIPING
In case of an emergency, each unit is equipped with a
relief valve on the evaporator, condenser and oil sepa-
rator discharge line to quickly relieve excess pressure
of the refrigerant charge to the atmosphere. The relief
valves are furnished in accordance with the American
Society of Heating, Refrigeration and Air Conditioning
Engineers Standard 15 (ASHRAE 15) in North Amer-
ica, or PED code in Europe. Valve specifications are
shown in Table 19 on page 56 .
Refrigerant relief vent piping (by others), from the re-
lief valves to the outside of the building, is required
by code, and must be installed on all units as shown in
Figure 37 on page 56. For additional information on
relief valve discharge line sizing, refer to ASHRAE 15
Addendum 15C and 15D-2000, Section 9.7.8.5.
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. Take precautions to make sure that the
outlets of relief valves or relief valve vent pipes remain
clear of obstructions at all times.
Piping must be properly supported to pre-
vent any strain on relief valve mounting.