System Operation , Testing , And Maintenance; System Testing; Environmental Control Functions; Cooling - Liebert 8 Tons User Manual

6.0 S O
YSTEM PERATION
This section describes system testing, maintenance and replacement procedures. Use copies of the
Maintenance Inspection Checklist to record preventive maintenance inspections.
WARNING
!
Unit contains hazardous electrical voltage. Disconnect power supply before working within.
Line side of factory disconnect remains energized when disconnect is off.
6.1

System Testing

6.1.1

Environmental Control Functions

The performance of all control circuits can be tested by changing the setpoints, which activates each
of the main functions.
6.1.2

Cooling

To test the cooling function, set the setpoint to a temperature of 10°F (5°C) below room temperature.
A call for cooling should register and prompt the equipment to begin cooling cycle. (Disregard any
temperature alarms). Upon completion of testing, return setpoint to the desired temperature.
6.1.3

Heating

Reheat may be tested by setting the setpoint 10°F (5°C) above room temperature. A call for heating
should register and prompt the equipment to begin heating cycle. (Disregard any temperature
alarms). Upon completion of testing, return setpoint to the desired temperature.
6.1.4

Humidification

To check humidification, set the humidity setpoint at RH 10% above the room humidity reading. After
a short delay, the canister will fill with water and steam will be produced. Upon completion of testing,
return the humidity setpoint to the desired humidity.
6.1.5

Dehumidification

The dehumidification performance can be tested by setting the humidity setpoint at RH 10% below
room relative humidity. The compressor should turn on. Upon completion of testing, return humidity
setpoint to the desired humidity.
6.1.6

Remote Shutdown

A connection point is provided for remote shutdown devices supplied by the customer. This terminal
strip is located in the electric panel. (Terminals 37 and 38 are fitted with a jumper when no remote
shutdown device is installed).
, T , M
ESTING AND AINTENANCE
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System Operation, Testing, and Maintenance