Eppendorf New Brunswick -86 °C Freezers G - Manual (Page 14)

HEF® and G -86 °C Freezers — Operating manual
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4.2.3 Installation categories (230 V, 50 Hz models only)
4.3 Requirements for water-cooled models
If your freezer has a water-cooled condenser, the following are water supply and drainage
requirements:
1 Water consumption will increase as water temperature increases.
2 The condenser must never be allowed to freeze during operation. If, during normal cycling,
water temperature approaches 6.0 °C, this must be checked.
3 This installation requires checking the high stage discharge pressure and may require an
adjustment of the water regulating valve; both operations MUST be carried out by a qualified
engineer.
Category Examples Requirements
A1 (domestic/ public) Hospitals
Prisons
Theatres
Schools
Supermarkets
Hotels
Dwellings < 0.15 kg refrigerant per
sealed system
B1 (commercial/ private) Business or professional
offices
Shops
Restaurants
Laboratories
General manufacturing < 0.15 kg refrigerant per
sealed system
Minimum flow
requirements 3.8 liters/minute
Max Inlet pressure 10 bars
Min Inlet pressure 1 bar
Maximum supply
temperature
1
25 °C
Minimum supply
temperature
2
7.0 °C
Connection size Inlet : 15 mm x ½” BSPT
Outlet: 15 mm x ½” BSPT
Water quality Water must be clean and free from particles that could cause
blockage in the regulating valve or heat exchanger. A suitable
inline strainer must be placed in the inlet pipe if there is any doubt
about the cleanliness of the supply. (Minimum filter requirement is
60 mesh 0.25 mm aperture).
Drainage requirements 3 A recirculated cooler return line and a main supply line to the
waste drain are required.
Typical Flow Rates At a setpoint of -85 °C, an ambient temperature of 25 °C, and a
water inlet temperature of 20 °C:
47 L/hr for the U725-G.
4
Installation