Technical data

Guide Specifications—For Liebert DataMate 1.5- to 3-Ton (5 to 10.5kW)
Liebert
®
DataMate
™
34
2.1.4 Alarms
2.1.4.1 Unit Alarms
The control system shall monitor unit operation and activate an audible and visual alarm in the event
of the following factory preset alarm conditions.
• High Temperature (max 90°F, 32.2°C)
• Low Temperature (min 35°F, 1.7°C)
• High Humidity (max 85% RH)
• Low Humidity (min 15% RH)
• High Water Alarm - Lockout Unit Operation
• High Head Pressure
• Loss of Power
• Compressor Short Cycle
2.1.4.2 Custom Alarms (2x)
• Humidifier Problem
• Water Detected
• Custom Alarm (1)
• Custom Alarm (2)
User-customized text can be entered for the two (2) custom alarms
2.1.4.3 Alarm Controls
Each alarm (unit and custom) shall be individually enabled or disabled (except for high head pressure
and high water in condensate pan) and can be programmed for a time delay of 0 to 255 seconds of
continuous alarm condition to be recognized as an alarm. Each alarm shall also be enabled or disabled
to activate the common alarm (except high head pressure and high water in condensate pan).
2.1.4.4 Audible Alarm
The audible alarm shall annunciate at the LCD wall box any alarm that is enabled by the operator.
2.1.4.5 Common Alarm
A programmable common alarm shall be provided to interface user selected alarms with a remote
alarm device.
2.1.4.6 Remote Monitoring
All alarms shall be communicated to the Liebert site monitoring system with the following
information: date and time of occurrence, unit number and present temperature and humidity.
2.2 Chilled Water System Components
2.2.1 Chilled Water Control Valve
The water circuit shall include a 2-way, slow-close On/Off solenoid valve. Design pressure shall be
300psi (2068kPa) with a maximum close-off pressure of 60psi (414kPa). Valve shall be spring return.
2.2.2 Chilled Water Coil
The cooling coil shall have a minimum of 2.6 ft.
2
(.24m
2
) face area, three rows deep. It shall be
constructed of copper tubes and aluminum fins and be mounted in a galvanized condensate drain pan.
The coil shall be designed for a maximum face velocity of _____FPM (m/s) at ___ CFM (CMH). The
water circuit shall be designed to distribute water into the entire coil face area. The coil shall be
supplied with ___ °F (°C) entering water temperature, with a ___°F (°C) temperature rise. The coil
shall be supplied with ___ GPM (l/s) of chilled water and the pressure drop shall not exceed
______ psi (kPa).