Refer to the appropriate piping general-arrangement schematics for your system for the recommended,
field-installed hardware such as shut-off valves. See Table 6.1 on page33.
• Equipment damage and personal injury can result from improper piping installation, leak
checking, fluid chemistry and fluid maintenance.
• Follow local piping codes, safety codes.
• Qualified personnel must install and inspect system piping.
• Contact a local water consultant regarding water quality, corrosion protection and freeze-
protection requirements.
• Install manual shut-off valves at the supply and return line to each indoor unit and drycooler to
permit routine service and emergency isolation of the unit.
• Install a monitored, fluid-detection system that is wired to activate the automatic closure of
field-installed coolant-fluid supply and return shut-off valves to reduce the amount of coolant
fluid leakage and consequential equipment and building damage. The shut-off valves must be
sized to close-off against the maximum coolant-fluid system pressure in case of a catastrophic
fluid leak.
Glycol Mixture
Add ethylene glycol or propylene glycol to the circuit in the percentages shown in the following table.
GLYCOL PERCENTAGE * BY
VOLUME
ETHYLENE GLYCOL - FREEZING
TEMPERATURE, °F (°C)
PROPYLENE GLYCOL - FREEZING
TEMPERATURE, °F (°C)
0% 32 (0) 32 (0)
10% 25.3 (-3.7) 28.9 (-1.7)
20% 16 (-8.9) 18.7 (-7.4)
30% 3.7 (-15.7) 8.4 (-13.1)
40% -12.6 (-24.8) -6.7 (-21.5)
* Freezing temperatures may vary slightly among commercially available glycol products; refer to manufacturer’s specifications.
Table 6.15 Glycol mixtures
Water/Glycol-cooled Piping Connections
• The unit must receive cooling water via:
• open circuit, see Open-circuit Applications on the next page, for additional requirements.
– or –
• closed circuit, see Closed-circuit Applications on the next page, for additional
requirements.
• Connect the refrigerant piping as described in Piping and Refrigerant Requirements on
page33.
• Use hoses connected with 3-piece joints to the condenser water inlet and outlet couplings.
• Install a field-supplied, 16-20 mesh strainer on the water/glycol supply to the indoor unit.
The strainer prevents particles in the water from entering the unit’s heat exchanger.
• Place shut-off ball valves at the indoor unit inlet and outlet to allow easy maintenance.
• Install a water drain system at the lowest point in the circuit.
• Fully-drain the piping before connecting it to the cooling unit.
Vertiv | Liebert CRV Installer/User Guide | 53
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