RVZC30 (and BB/T/TBB/WA), RVZP30 (and BB/T/TBB/WA), RVC24
17
0407
REFRIGERATION
General
Unless otherwise specified, the liquid and suction connections
are made inside the case under the evaporator fan/coil cover.
Refrigerant piping may enter the case through the front left
bottom, the left rear bottom of case or the left rear top of case.
The copper pipe should not touch or rub on the edges of the
sheet metal. After connections have been made, the refrigera-
tion access hole in the case must be sealed completely with
aerosol-dispensed Urethane insulation or equivalent (i.e.: Great
Stuff). Penetrations made in sheet metal baffles should also be
sealed (Figure 16).
Refrigerant Piping
Correct refrigeration line sizing and installation is essential for
proper system operation (Figure 17A & 17B). A P-trap must be
installed at the bottom of all vertical suction risers (Figure 18).
Various risers are available as a factory installed option.
When two or more case sections are connected to one com-
pressor, the main liquid and suction line for the group should
be run through the cases and be brought out through the refrig-
eration outlet of one case only. The factory recommends one
riser per circuit/system for hot gas defrost when using top back
refrigeration exit. Circuit risers are available as a factory in-
stalled option. On 30" wide door cases with suction lines over
1-3/8” diameter, a P-trap made with 45° elbows is required
(Figure 18). A piping chase in front of the fan shroud allows
the refrigerant lines to be run through the right or left end frame.
Piping should not be placed near the electric defrost heaters.
The defrost heaters on the 30" door cases will grow one inch to
the left of the coil when they reach operating temperature.
The compressor should be installed as close as possible to the
cases to reduce pressure drop. Install a shallow trap at the
bottom of the riser.
The suction and liquid lines may be taped together to form an
external heat exchanger. Insulate the tubing for at least 20 feet
from the case outlet.
Figure 16: Penetration sealing
The best location for the liquid line drier is inside the freezing
compartment. However, it may be installed near the compres-
sor for easy maintenance. Install moisture indicating sight glass
at the outlet end of the drier.
A low pressure or temperature control can be used to control
case temperature. The control should be selected with adequate
contact capacity for the switching load. In rack systems, an
evaporator pressure-regulating valve may be used to control
the evaporating temperature.
The settings (See Figure 19) are approximate due to variations
in gauge accuracy, differences in compressor efficiency, line
pressure drop and super heat settings. Before making adjust-
ments for store or stocking conditions, make sure the super
heat is set between 6°F and 10°F. Close coupled systems
typically run at the higher end of this range to avoid flood
back.
Fill in area with foam after installation
Fill in area with foam after installation
Seal sheet metal perforation
Summary of Contents for RVZC30
Page 1: ......
Page 2: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 2 0407...
Page 5: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 5 0407 Figure 1 Case label information...
Page 9: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 9 0407 Figure 5B All base locations...
Page 10: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 10 0407 Figure 5C All base locations...
Page 24: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 24 0407 Figure 23 Hot gas wiring...
Page 25: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 25 0407 Figure 24 Single point wiring...
Page 26: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 26 0407 Figure 25 Master satellite wiring...
