Howe Rapid Freeze, Service Manual

Page: 25 / 78

6 SEAWATER MODEL INSTALLATION
19
*** IMPORTANT NOTICE ***
When piping ice flaker to a central refrigeration rack, liquid line must be connected to
the receiver side of any defrost solenoid/control valve to insure uninterrupted liquid
feed/supply during normal defrost cycles of the rack.
*** IMPORTANT NOTICE ***
When installing a seawater ice flaker, it is important that the flaker is properly piped as shown
on the piping schematic on page 26. On the liquid line, install a filter/drier (not supplied).
When connecting to a dedicated oversized condensing unit or refrigeration rack system, an EPR
valve must also be provided and installed to regulate the evaporator suction temperature to
between -35
°
F and -30
°
F (-37.1
°
C to -34.3
°
C)
Liquid Line: For longer runs, good refrigeration practice dictates that the liquid line be
one size larger to prevent flashing due to excessive pressure drop. If the system is fully
charged, the presence of bubbles in the sight glass at the ice flaker is a visible indication
that flashing is occurring. It may not be possible to adjust the thermostatic expansion
valve properly when this condition exists. Note - Flashing may also occur if the liquid
line is run through hot areas of the vessel, such as boiler rooms or smoke rooms. If this is
the case, the liquid line should be insulated.
*** IMPORTANT NOTICE ***
When connecting to a low temperature rack (below -35 ° F –37.1 ° C) you must provide and
install a suction pressure regulator (EPR Valve) to control suction pressure at the ice
flaker at approximately -30
°
F(-34.3
°
C).
*** IMPORTANT NOTICE ***
Suction Line: For longer than 50 foot run, the next size suction line may be used for
horizontal runs and slightly pitched towards the compressor rack. Vertical risers should
be the same size as the ice flaker connection size to maintain proper velocity for oil
return. If the vertical riser is more than 10 feet, it is necessary to install a P-trap at the
bottom of the riser. Install an additional trap for each 15ft of riser to facilitate oil lift.
Suction line should always be insulated.
Suction and Liquid lines should always be supported and secured to avoid damage and or
refrigeration leaks.