Liebert® Mini-Mate2™— 3-Ton
GUIDE SPECIFICATIONS
1.0	GENERAL
1.1	SUMMARY
These specifications describe requirements for an environmental control system. The system shall be designed to control temperature and relative humidity conditions within the room.
The manufacturer shall design and furnish all equipment in the quantities and configurations shown on the project drawings.
System shall be supplied with CSA Certification to the harmonized U.S. and Canadian product safety standard CSA C22.2 No 236/UL 1995 for “Heating and Cooling Equipment” and marked with the 
CSA c-us logo (60Hz only).
1.2	Design Requirements
The environmental control system shall be a Liebert Mini-Mate2 factory-assembled unit. On direct expansion models, the refrigeration system shall be split, with the compressor located in a remote or close-coupled condensing unit.
The evaporator section shall be designed for above dropped-ceiling installation. Condensing units shall be designed for either outdoor.
1.3	Submittals
Submittals shall be provided with the proposal and shall include: Dimensional, Electrical and Capacity data; Piping and Electrical Connection Drawings.
1.4	Quality Assurance
The specified system shall be factory-tested before shipment. Testing shall include, but shall not be limited to: Quality Control Checks, “Hi-Pot” Test (two times rated voltage plus 1000 volts, per NRTL agency requirements), and Metering Calibration Tests. The system shall be designed and manufactured according to world-class quality standards. The manufacturer shall be ISO 9001 certified.
2.0	Product
2.1	Standard Features/All Systems
2.1.1	Evaporator Cabinet Construction
The cabinet and chassis shall be constructed of heavy gauge galvanized steel, and shall be serviceable from one side. Mounting brackets shall be factory-attached to the cabinet. Internal cabinet insulation shall meet ASHRAE 62.1 requirements for Mold Growth, Humidity & Erosion, tested per UL 181 and ASTM 1338 standards.
2.1.2	Air Distribution
The air distribution system shall be constructed with a quiet, direct-drive fan assembly equipped with double-inlet blower, self-aligning ball bearings and lifetime lubrication. Fan motor shall be permanent-split capacitor, high-efficiency type, equipped with two speeds for airflow modulation. Dehumidification shall utilize the lower fan speed.
Each system shall be capable of delivering 1000 CFM at high fan speed. The circulating-air fan shall be two-speed for precise dehumidification control. 
System shall be suitable for plenum – Supply Air Distribution Plenum.
2.1.3	Microprocessor Control
The control system shall be microprocessor-based, factory-wired into the system and tested prior to shipment. The wall-mounted control enclosure shall include a 2-line by 16-character LCD providing continuous display of operating status and alarm condition. An 8-key membrane keypad for setpoint/ program control, fan speed selection and unit On/Off shall be located below the display. The control display shall be field-wired to the control board using 4-conductor field-supplied thermostat wire.
Temperature and humidity sensors shall be located in the wall box, which shall be capable of being located up to 300 ft (91.4m) from the evaporator unit.
2.1.3.1	Monitoring
The LCD shall provide On/Off indication, operating mode indication (cooling, heating, humidifying, dehumidifying), fan speed indication and current day, time, temperature and humidity indication.
2.1.3.2	Control Setpoint Parameters
•	Temp. Setpoint 65-85°F (18-29°C)
•	Temp. Sensitivity 1-9.9 °F (1-5°C)
•	Humidity Setpoint 20-80% RH
•	Humidity Sensitivity 1-30% RH
2.1.3.3	Unit Controls
2.1.3.3.1	Compressor Short-Cycle Control
The control system shall prevent compressor short-cycling by a 3-minute timer from compressor stop to the next start.
2.1.3.3.2	Common Alarm and Remote On/Off
A common alarm relay shall provide a contact closure to a remote alarm device. Two (2) terminals shall also be provided for remote On/Off control. Individual alarms shall be “enabled” or “disabled” from reporting to the common alarm.
2.1.3.3.3	Setback Control
The control shall be user-configurable to use a manual setpoint control or a programmable, time-based setback control. The setback control will be based on a 5 day/2 day programmed weekly schedule with capability of accepting 2 events per program day.
2.1.3.3.4	Temperature Calibration
The control shall include the capabilities to calibrate the temperature and humidity sensors and adjust the sensor response delay time from 0 to 90 seconds. The control shall be capable of displaying temperature values in °F or °C.
2.1.3.3.5	System Auto Restart
For startup after power failure, the system shall provide automatic restart with a programmable (up to
9.9 minutes in 6-second increments) time delay. Programming can be performed either at the wall‑mounted controller or from the central, site-monitoring system.
2.1.4	Alarms
2.1.4.1	Unit Alarm
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
•	Low Temperature
•	High Humidity
•	Low Humidity
•	High Water Alarm - Lockout Unit Operation
•	High Head Pressure
•	Loss of Power
•	Compressor Short Cycle
2.1.4.2	Custom Alarms (2x)
•	Humidifier Problem
•	Filter Clog
•	Water Detected
•	Smoke Detected
•	Custom 1
•	Custom 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 separately enabled or disabled, selected to activate the common alarm (except for high head pressure).
2.1.4.4	Audible Alarm
The audible alarm shall annunciate 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. Alarms shall be enabled or disabled from reporting to the common alarm.

Direct Expansion System Evaporator Components
2.1.5	Direct Expansion Coil
The evaporator section shall include evaporator coil, thermostatic expansion valve and filter drier.
The evaporator coil shall have 3.1 sq. ft. face area, 3 rows deep. It shall be constructed of copper tubes and aluminum fins. An externally equalized thermostatic expansion valve shall control refrigerant flow. The evaporator coil shall be factory-charged with R-407C refrigerant and sealed. The evaporator unit can be coupled directly with a ceiling mounted condensing unit or mounted remote to the condensing unit.
The coil shall be provided with a condensate drain pan with an internally trapped drain line. The evaporator drain pan shall include a factory-installed float switch to shut down the evaporator upon high water condition
2.3	Outdoor Air-Cooled Prop Fan Condensing Unit
Condensing unit components shall include a condenser coil, a direct-drive propeller-type fan, a scroll compressor, high-pressure switch, and head pressure control valve, hot gas bypass system and liquid line solenoid valve. A hot gas bypass system shall be provided to reduce compressor cycling and improve operation under low load conditions.
All components shall be factory-assembled, charged with R-407C refrigerant and sealed. No internal piping, brazing, dehydration or charging shall be required. Condensing unit shall be designed for 95°F ambient and be capable of operation to -30°F.
The condenser coil shall be constructed of copper tubes and aluminum fins.
2.1.6	Steam Generating Humidifier
The environmental control system shall be equipped with a steam generating humidifier that is controlled by the microprocessor control system. It shall be complete with disposable canister, all supply and drain valves, 1" (25.4mm) air gap on fill line, inlet strainer, steam distributor and electronic controls. The need to change canister shall be annunciated on the microprocessor wall box control panel. The humidifier shall have a capacity of 4.3 lb/hr (2.0 kg/h). An LED light on the humidifier assembly shall indicate cylinder full, overcurrent detection, fill system fault and end of cylinder life conditions.
2.1.7	Electric Reheat
The electric reheat shall be low-watt density, 304/304 stainless steel, finned-tubular and shall be capable of maintaining room dry bulb temperature conditions when the system is calling for dehumidification. The reheat section shall include a UL-approved safety switch to protect the system from overheating. The capacity of the reheat coils shall be 6.8 kW, with unit input voltage of 208V, controlled in one stage.
2.2	Ship-Loose Accessories
2.2.1	Air Distribution Plenum
The evaporator section shall be supplied with an air distribution plenum with integral filter. The plenum shall be 24" x 48" in size and shall provide 3-way air distribution, for installation into a standard 24" x 48" ceiling grid. Filter size shall be 4" x 16" x 25", deep pleated type with MERV 8 rating, based on ASHRAE 52.2-2007.
2.2.2	Condensate Pump
Condensate Pump shall be complete with integral float switch, pump, motor assembly and reservoir.
2.2.3	Refrigerant Line Sweat Adapter Kit
Provide a sweat adapter kit to permit field brazing of refrigerant line connections.
3.0	Execution
3.1	Installation of Air Conditioning Unit
3.1.1	General
Install air conditioning unit in accordance with manufacturer's installation instructions. Install unit plumb and level, firmly anchored in location indicated, and maintain manufacturer’s recommended clearances.
3.1.2	Electrical Wiring
Install and connect electrical devices furnished by manufacturer but not specified to be factory-mounted. Furnish copy of manufacturer’s electrical connection diagram submittal to electrical contractor. Install and wire per local and national codes.
3.1.3	Piping Connections
Install and connect devices furnished by manufacturer but not specified to be factory-mounted. Furnish copy of manufacturer’s piping connection diagram submittal to piping contractor.
3.1.4	Supply and Drain Water Piping
Connect water supply and drains to air conditioning unit. Unit drain shall be trapped internally.
3.2	Field Quality Control
Startup air conditioning unit in accordance with manufacturer’s startup instructions. Test controls and demonstrate compliance with requirements.