Thermo Scientific 5900 Series User Manual page 39

Section 5
Factory Installed Options
Water-cooled
Condenser (cont.)
Figure 5-1. Bypass Water Loop Options
5-10 Model 900 and 5900 Series
Caution When using multiple freezers in a water loop, proper water flow
and inlet temperature must be maintained for EACH freezer in the loop. It
is recommended that a valve be installed in the supply line of each freezer
to facilitate a balanced flow rate.
If the number of freezers in a loop is more than 5, it is recommended that
one freezer be started at a time and tested to verify water flow, before
starting all and allowing to run. Water flow of at least 1 gpm, at or below
the maximum allowed inlet temperature, is required. Values higher than
minimum are acceptable. Do not allow the freezer to continue to run
with no observed water flow within several seconds of the compressor
s
starting.
Recommended Bypass Water Loop Assembly: The bypass loop contains
fittings, a valve, and a flowmeter to simulate the presence of a freezer and
allows for balancing of the entire water supply system to ensure that 1 gpm
is available for each freezer in the loop before the freezers are started.
Values higher than minimum are acceptable. Do not adjust the valve
inside the deck of the freezer. It is pre-set at the factory.
Option A: Install the bypass instead of a freezer (Figure 5-1).
Option B: Install the bypass permanently (Figure 5-1) so that all
freezers can be left connected but water flow can be simulated using
the bypass without turning on all freezers.
Caution If Option B is used, the bypass valve MUST be closed prior to
freezer operation to ensure all water passes through the freezer rather than
the bypass. Failure to do this will result in damage to the freezer.
Thermo Scientific