Vertiv Liebert Drycooler - Operation; Start-up Checklist; Startup: Drycooler Aquastat Settings

9 OPERATION
WARNING! Risk of electric shock. Can cause equipment damage, injury or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before working within
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.
9.1 Start-up Checklist
NOTICE
Risk of overheated pump seals. Can cause piping system damage, coolant fluid leaks, and substantial building
damage.
Do not run pumps without fluid in the system. Pump seals require fluid to keep them cool; running them without
fluid for any amount of time will damage the seals, which may cause a failure.
Refer to Electrical Power Requirements and verify that all installation items have been completed prior to proceeding.
• Turn the drycooler disconnect ON.
• Turn on indoor units and set for cooling to allow operation of drycooler fan and pump controls.
• Check the fans for proper rotation (air discharging up).
• Check the pumps for proper rotation.
9.2 Startup: Drycooler Aquastat Settings
The fan-off temperature of the aquastat (fluid temperature controls) should be set according to factory-supplied schematic,
shipped inside the drycooler’s electric panel. Settings may need to be field adjusted based on the indoor unit’s glycol
regulating valve type, drycooler size and the number of drycoolers on the loop.
Applications with the Optional Stat Setting require field piping to be insulated to prevent condensation. Table 9.1 on the
next page, shows acceptable applications where stats must be adjusted to Optional Setting.
Aquastats must be field-adjusted to Optional Setting for:
• GLYCOOL/Dual Cool applications
• Glycol loop applications with only one drycooler and one indoor unit containing motorized ball valve controls
(MBV). MBVs are used in all Liebert CRV and Liebert PDX water/glycol units and those Liebert DS
water/glycol units with digital scroll compressors (7th digit of model number = D, e.g., DS/VSxxxxD).
• Drycoolers with DSF or DDF controls should have setpoint temperature adjusted based on AQ1 temperatures.
See Table 9.2 on the next page
9 Operation
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