® ENVIRONMENTAL CONTROL MINI-MATE2 INSTALLATION, OPERATION & MAINTENANCE MANUAL MANUAL 8 Tons 50 & 60 Hz
TABLE OF CONTENTS SYSTEM OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.0 PRODUCT FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Standard Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.1 1.1.2 1.1.3 1.2 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation. . . . . . . . . . . . . . . . . . . 28 2.7.1 2.7.2 2.7.3 2.8 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 4.3.1 4.3.2 4.4 Electric Reheat - Staged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 SCR Electric Reheat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Dehumidification / Humidification Percent Required . . . . . . . . . . . . . . . . . .
FIGURES Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 System Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Threaded Rod and Hardware Kit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SYSTEM OVERVIEW Table 1 Model Number Nomenclature Evaporators and Chilled-Water Units MMD96E-AHEL0 (example) MM D Mini-Mate2 0 = No Disconnect D = Disconnect Indoor Condensing Units MCD96ALA00 (example) MC D 96E- = 8-ton Evaporator, 60 Hz 96E- A H 95E- = 8-ton Evaporator, 50 Hz 8TCD = 8-ton Chilled-Water w/ 2-way valve D= Disconnect 96A = 8-ton Air-Cooled Centrifugal, 60 Hz 96A 95A = 8-ton Air-Cooled Centrifugal, 50 Hz 98W = 8-ton Water/Glycol-Cooled, 60 Hz 97W = 8-ton Water/Glycol, 50 Hz A = 46
Table 2 Heat Rejection Matchup – 60 Hz Condensing Unit Nominal Capacity Cooling Unit Indoor Air-Cooled Centrifugal Fan 8 tons MMD96E MCD96A 8 tons MMD8TC Table 3 Outdoor AirCooled Propeller Fan Indoor Water/ Glycol PFC096A MCD98W Chilled Water Unit Heat Rejection Matchup – 50 Hz Condensing Unit Nominal Capacity Cooling Unit Indoor Air-Cooled Centrifugal Fan 8 tons MMD95E MCD95A MMD8TC 2 Outdoor AirCooled Propeller Fan Indoor Remote Water/GlycolCooled PFC095A MCD97W Chilled Water
1.0 PRODUCT FEATURES 1.1 Standard Product Features The Mini-Mate2 is a temperature/humidity control system designed to be installed above a ceiling grid system. The unit is available as a split system evaporator to be matched with an Indoor Centrifugal Fan Condensing Unit, Outdoor Prop Fan Condensing Unit, or Indoor Water/Glycol Condensing Unit. A self-contained Chilled Water Fan Coil is also available. 1.1.
1.2 Optional Equipment 1.2.1 Canister Humidifier The optional, factory-installed steam generating humidifier adds pure water vapor to the room air to control humidity. Room humidity setpoints are established by the user. The humidifier components include: a steam canister (replaceable), control board, inlet strainer, fill and drain valves. 1.2.2 Electric Reheat The 304/304 stainless steel electric reheat is energized when required to heat room air or to control room temperature during dehumidification.
1.3 Ancillary (Ship Loose Accessories) 1.3.1 Single Point Power Kit A Single Point Power Kit allows the connection of a system (Evaporator and indoor condensing unit) to a single power source when the units are close coupled. The kit includes a junction box with power distribution, sub-fusing, and evaporator and condenser wiring. 1.3.
2.0 SITE PREPARATION AND INSTALLATION NOTE Before installing unit, determine whether any building alterations are required to run piping, wiring, and duct work. Carefully follow all unit dimensional drawings and refer to the submittal engineering dimensional drawings of individual units for proper clearances. 2.1 Installation Considerations The evaporator unit is usually mounted above the suspended ceiling using field supplied threaded rods. Refer to Figure 1 for possible configurations.
2.1.2 Location Considerations ! CAUTION Units contain water. Water leaks can cause damage to sensitive equipment below. DO NOT MOUNT UNITS OVER SENSITIVE EQUIPMENT. A field-supplied pan with drain must be installed beneath cooling units and water/glycol-cooled condensing unit. NOTE Do not mount units in areas where normal unit operating sound may disturb the working environment. Locate the evaporator unit over an unobstructed floor space if possible.
Figure 1 System Configurations Air-Cooled Systems Water-Cooled Systems Chilled-Water Systems Glycol-Cooled Systems Coupled Components (Air-Cooled System Shown) 8 Site Preparation and Installation
2.2 System Weights Table 7 Unit Weights Cooling Units* lbs kg MMD96E 665 302 MMD95E 665 302 Condensing Units lbs kg MCD96A 530 241 MCD95A 530 241 MCD98W 470 213 MCD97W 470 213 *Add 40 lbs. (20 kg.) to units with free cooling or hot water reheat coils. 2.3 Equipment Inspection (upon receipt) When the unit arrives, do not uncrate equipment until it is close to its final location. All required assemblies are banded and shipped in corrugated containers.
Figure 2 Threaded Rod and Hardware Kit Installation 1/2" threaded rod (supplied by field) hanging bracket 1" O.D. spring 1/2" flat washer 1/2" Nylock locking nut 2.4.1 base pan (ref) 1/2" hex nut Close Coupled Installations If the evaporator and condensing units are to be mounted side-to-side (close coupled), hang each unit before connecting them together (See Figure 3). If Single Point Power Kit is used, install the box into the evaporator prior to suspending the units.
2.4.2 Evaporator Air Distribution Filter Box The optional filter box mounts directly to the return air opening of the evaporator. The filter box is supplied with two (2) 20% (Liebert part no. A-0320) or 30% (Liebert part no. A-0400) 25" x 20" x 4" filters. NOTE Do not operate the unit without filters installed in return air system.
2.4.3 Piping Connections and Coolant Requirements Drain Line ! CAUTION The drain line must not be trapped outside the unit, or water may back-up in drain pan. Drain is internally trapped. This line may contain boiling water. Use copper or other suitable material for the drain line. Sagging condensate drain lines may inadvertently create an external trap. A 3/4 in. (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate drain.
Condensate Pump The optional condensate pump kit is required when the evaporator is installed below the level of the gravity-fed drain line. Refer to the installation instructions provided with the condensate pump kit. Figure 5 Condensate Pump Installation Humidifier Water Supply Line Units supplied with the optional humidifier package have a 1/4 in. (6.4 mm) FPT connection for water inlet. Supply pressure range is 10 psig to 150 psig. Required flow rate is 1 gpm.
Chilled-Water Piping (chilled-water systems only) Refer to Figure 6 for recommended field installed hardware such as shut-off valves and hose bibs. Chilled-water supply and return lines must be insulated to prevent condensation. The minimum recommended water temperature is 42°F. Connection sizes are 1-1/4" FPT.
Refrigerant (R-22) Piping All split systems require two sets of refrigerant lines (two insulated copper suction lines and two copper liquid lines) between the evaporator and the condensing unit. Two possible methods exist for installing the copper suction and liquid lines. • Close coupling the units together using the quick connects. • Using an optional Sweat Adapter Kit and hard piping between the two units. All refrigeration piping should be installed with high temperature brazed joints.
Refrigerant Charge Requirements: Total refrigerant charge (R-22) will be required only if units are evacuated during installation or maintenance. For safe and effective operation, refer to 2.4.3 - Piping Connections and Coolant Requirements. Total refrigerant = Units and Lines Table 10 8-Ton Unit Refrigerant Charge Evaporator Model No.
Figure 8 Evaporator or Chilled-Water Unit Dimensional Data Site Preparation and Installation 17
2.4.4 Electrical Connections, Evaporator or Chilled-Water Unit ! ! WARNING UNIT CONTAINS HAZARDOUS ELECTRICAL VOLTAGE. DISCONNECT POWER SUPPLY BEFORE WORKING WITHIN. LINE SIDE OF FACTORY DISCONNECT REMAINS ENERGIZED WHEN DISCONNECT IS OFF. WARNING UNIT CONTAINS HAZARDOUS ELECTRICAL VOLTAGE. MORE THAN ONE DISCONNECT MAY BE REQUIRED TO REMOVE POWER. EVAPORATOR AND CONDENSING UNITS MAY HAVE SEPARATE DISCONNECTS. OPEN ALL DISCONNECTS BEFORE WORKING WITHIN.
Figure 9 Evaporator Unit Electrical Connections Customer Remote Alarm Connection TB50,51,56,24. Field-supplied 24V Class 2 wiring. Earth Ground Connection Connection terminal for field supplied earth grounding wire. Optional factory installed disconnect switch. High Volt Power Connections Electric service connection terminals. Common Alarm Connection. Use field-supplied 24V Class 2 wire. TB75-76. Fluid Cooler/Circulating Pump Control Circuit TB70-71. Optional w/Glycool/Econ-O-Cycle models.
2.5 Indoor Air-Cooled Centrifugal Fan Condensing Unit Installation 2.5.1 Location Considerations The centrifugal fan air-cooled condensing unit may be located above the dropped ceiling or any remote indoor area. If noise is of concern, the condensing unit should be located away from personnel. Normal operating sound may be objectionable if the condensing unit is placed near quiet work areas. To mount the unit in the ceiling, refer to 2.
2.5.3 Piping Connections Details for refrigerant (R-22) loop piping are in 2.4.3 - Piping Connections and Coolant Requirements. Figure 10 Piping Connections - Indoor Air-Cooled Centrifugal Fan Condensing Unit Two circuits provided. Single circuit shown. 2.5.4 Electrical Connections - Condensing Unit Refer to 2.4.4 - Electrical Connections, Evaporator or Chilled-Water Unit and Figure 12 for general wiring requirements and cautions. Refer to electrical schematic when making connections.
Figure 11 Indoor Air-Cooled Centrifugal Condensing Unit Dimensions and Pipe Connections 22 Site Preparation and Installation
Figure 12 Indoor Air-Cooled Centrifugal Condenser Electrical Connections 1. 24V GND System 1 2. 24V Supply System 1 3. High-Pressure Alarm System 1 4. Hot Gas Bypass Connection System 1 (only on units with hot gas bypass. If no hot gas bypass, connection is provided in the evaporator module. Connect wire 4 and wire 2 to the 24V supply). 5. 24V GND System 2 6. 24V Supply System 2 7. High-Pressure Alarm System 2 8. Hot Gas Bypass Connection System 2 (only on units with hot gas bypass.
2.6 Outdoor Air-Cooled Condensing Unit Installation 2.6.1 Location Considerations To insure a satisfactory air supply, locate air-cooled propeller fan condensing units in an environment providing clean air, away from loose dirt and foreign matter that may clog the coil. Condensing units must not be located in the vicinity of steam, hot air, or fume exhausts, or closer than 18 inches from a wall, obstruction, or adjacent unit.
Figure 13 Electrical field connections - outdoor condensing unit 10 24V Supply Condenser Fan Site Preparation and Installation 25
Figure 14 Footprint Dimensions - Outdoor Condensing Unit Model 26 Dimensional Data in.
Figure 15 Piping and Electrical Connections - Outdoor Condensing Unit Model Numbers Electrical Connections In. (mm) Piping Connections In.
2.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation 2.7.1 Location Considerations The condensing unit may be located above the dropped ceiling or any remote indoor area. If noise is of concern, the condensing unit should be located away from personnel. Normal operating sound may be objectionable if the condensing unit is placed near quiet work areas. To mount the unit in the ceiling, refer to 2.4 - Installing the Evaporator or Chilled-Water Units. 2.7.
Figure 16 Indoor Water/Glycol Condensing Unit Dimensional Data 1. 24V GND System 1 2. 24V Supply System 1 3. High-Pressure Alarm System 1 4. Hot Gas Bypass Connection System 1 (only on units with hot gas bypass. If no hot gas bypass, connection is provided in the evaporator module. Connect wire 4 and wire 2 to the 24V supply). 5. 24V GND System 2 6. 24V Supply System 2 7. High-Pressure Alarm System 2 8. Hot Gas Bypass Connection System 2 (only on units with hot gas bypass.
Figure 17 Indoor Water/Glycol Condensing Unit Electrical Field Connections 30 Site Preparation and Installation
Figure 18 System Piping with Indoor Water/Glycol-Cooled Condensing Unit Two circuits provided. Single circuit shown.
2.8 Optional Equipment Piping 2.8.1 Free-Cooling Coil (Glycool) The free-cooling coil is a secondary coil located upstream of the DX coil. To take maximum advantage of available free-cooling, the secondary coil may operate at the same time as the DX coil. A temperature sensor is factory-mounted to the free-cooling piping.
Figure 20 Optional Free Cooling Coil (3-Way Valve) on Air-Cooled Units Site Preparation and Installation 33
2.8.2 Hot Water Reheat Coil Building hot water can be piped to a factory-installed hot water reheat coil located downstream of the cooling coil. A factory-installed slow open/close valve opens upon a call for reheat.
2.9 Checklist for Completed Installation ___ 1. Proper clearance for service access has been maintained around the equipment. ___ 2. Equipment is level and lock-nuts are installed with the leveling nuts on the spring isolators. ___ 3. Piping completed to refrigerant or coolant loop (if required). Refrigerant charge added (if required). ___ 4. Condensate pump installed (if required). ___ 5. Drain line Connected. ___ 6. Water supply line connected to humidifier (if required).
3.0 MICROPROCESSOR CONTROL The Microprocessor Control for the Liebert Mini-Mate2 unit features an easy to use menu-driven LCD display. The menus, control features, and circuit board details are described in this section. Detailed information concerning controls (4.0 - System Performance Microprocessor Controls) and alarms (5.0 - Alarms) are provided. 3.1 Feature Overview To turn the unit ON, press the ON/OFF (I/O) key after power is applied.
3.2 Main Menu
3.3 Setpoints Setpoints and system setup parameters are kept in nonvolatile memory. Selecting SETPOINTS from the Main Menu will display the following selections: • • • • • • • • TEMPERATURE SETPOINT TEMPERATURE SENSITIVITY HUMIDITY SETPOINT HUMIDITY SENSITIVITY HIGH TEMPERATURE ALARM LOW TEMPERATURE ALARM HIGH HUMIDITY ALARM LOW HUMIDITY ALARM Scroll through this sub-menu by using the UP/DOWN arrow, then press ENTER to select a particular function.
3.7 Time The controller time clock must be set to allow for the setback control. The clock uses the 24-hour system (i.e., 12 midnight is entered 24:00). To change the time press ENTER to select the function, then use the UP/DOWN arrow to change the first character, press ENTER to store, then press the UP/DOWN arrow key to change the character, press ENTER to store, etc. The real time clock is backed-up. 3.8 Date The controller date must be set to allow for setback control.
3.10.2 C/F Degrees The control may be selected to show readings and setpoints in either degrees Fahrenheit (°F) or in degrees Celsius (°C). To change the value use ENTER to select this function, then use the UP/ DOWN arrow to change the value. Press ENTER to store the value. 3.10.3 Humidity Control Method The operator may select either relative (direct) or absolute (predictive) humidity control. If “relative” is selected, the RH control is taken directly from the RH sensor.
Table 15 Set-Up Functions, Default Values and Allowable Ranges Function 3.11 Default Range Restart Time Delay 0.1 0 to 9.9 min (0 = manual restart) C/F Degrees °F °C or °F Humidity Control Rel Relative or Absolute Valve Time 165 50 to 250 sec(s) CW Flush 24 0 to 99 hours Change Passwords The display will prompt the operator to enter a three digit password when attempting to make changes. The system includes two (2) passwords, one for setpoints and one for setup.
3.14 Alarm Time Delay Each individual alarm can be programmed with a time delay (Table 16), causing the unit to delay a specified amount of time (0-255 seconds) before recognizing the alarm. The alarm condition must be present for the full amount of the time delay before the alarm will sound. If the alarm condition is diverted prematurely, the alarm will not be recognized and the time delay will automatically reset.
3.17 Custom Text To modify the two custom alarm messages select “CUSTOM TEXT”. Then select “Custom Text #1,” “Custom Text #2” or “Custom Text #3.” Text can be up to 16 characters in length and can be either a blank space or any of the following alphanumeric characters and symbols: • A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z • #,%,*,• 0,1,2,3,4,5,6,7,8 or 9 Use the UP/DOWN arrows to select a character, then press ENTER.
3.18 Run Diagnostics By selecting Run Diagnostics, maintenance personnel can check system inputs, outputs, and conduct a test of the microcontroller circuit board from the wall box control. A review of the system inputs and the microcontroller test can be done without interrupting normal operation. Test Outputs • When this feature is selected, the controller is effectively turned off. When stepping from one load to the next, the previous load is automatically turned off.
Test Micro By selecting this function, the microcontroller will perform a self test lasting approximately 10 seconds. When the test is complete, the display will show the ROM checksum, ROM part number, and firmware revision number.
Figure 24 Control Board (Inside Evaporator) P40 P32 P18 P7 P25 T+ T+5V GND P8 TB3-4 TB3-3 TB3-2 TB3-1 Connection to Terminal #4 Wallbox Connection to Terminal #3 Wallbox Connection to Terminal #2 Wallbox Connection to Terminal #1 Wallbox P33 P34 P26 P5 P16 P16 Remote Sensor Connection P10 P35 P36 P22 P38 P39 P43 P3 P2 P1 P4 TB G2 G3 G4 G5 Figure 25 Wallbox Board TB3-1 TB3-2 TB3-3 TB4-4 Wallbox DIP Switches (1-8) 46 Microprocessor Control
4.0 SYSTEM PERFORMANCE MICROPROCESSOR CONTROLS 4.1 Control Type Response Proportional Control The percent requirement is determined by the difference between the return air temperature and the temperature setpoint. As the return air temperature rises above the temperature setpoint, the percent cooling required increases proportionally (from 0 to 100%) over a temperature band equal to the temperature sensitivity plus 1 degree Fahrenheit.
4.4 Dehumidification / Humidification Percent Required The humidity control for the MM2 is based on a calculated percent requirement for dehumidification or humidification. The percent requirement is calculated from the difference between the sensor reading and the humidity setpoint, divided by the sensitivity. The control method is selectable between relative and absolute. Relative humidity control is the default. 4.4.
5.0 ALARMS The microprocessor control system will audibly and visually signal all ENABLED Alarms (including two (2) custom alarms). These special alarms can be chosen from the optional alarm list and/ or can have their own fully custom text. The custom alarm inputs are contact closures wired from terminal 24 through a normally open contact to either 50 (alarm 1), 51 (alarm 2), or 56 (alarm 3). The alarms can be enabled/disabled (refer to 3.
5.1.3 Humidity The humidity alarm may be activated under the following conditions: • High: The room return air humidity exceeds the pre-set high humidity alarm setpoint. Is the unit set up for dehumidification? Check DIP switch. • Low: The room return air humidity decreases to the low humidity alarm setpoint. Is the unit setup for humidification? Check DIP switch. • High and Low Humidity (simultaneously): The simultaneous display of two alarms results in loss of the humidity input signal.
5.2 Optional/Custom Alarms 5.2.1 Change Filter Periodically, the return air filters in the evaporator must be changed. The Change Filter alarm notifies the user that filter replacement is necessary. A differential air pressure switch closes when the pressure drop across the filters becomes excessive. The switch is adjustable using the procedure on the switch label. 5.2.2 Firestat The optional firestat feature is a bi-metal operated sensing device with a closed switch under normal conditions.
6.0 SYSTEM OPERATION, TESTING, AND MAINTENANCE 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.
6.2 Maintenance and Component Operation 6.2.1 Electric Panel The electric panel should be inspected on a semi-annual basis for any loose electrical connections. 6.2.2 Filters Filters are usually the most neglected item in an environmental control system. In order to maintain efficient operation, they should be checked monthly and changed as required. ALWAYS TURN POWER OFF BEFORE REPLACING FILTERS. Filters are replaced by opening the hinged door on the return air filter box. 6.2.
6.2.4 Electric Reheat Reheat element sheets and fins are manufactured with stainless steel. Regular inspections are necessary to assure proper cleanliness of the reheating element. Should inspection reveal corrosion particles on the reheating element or adjoining surfaces (including ducts and plenums), appropriate cleaning should be performed. Periodic replacement of the reheating element may be necessary to meet specific application requirements. 6.2.
Regulating Valves (Water/Glycol Condensing Units) The water regulating valve automatically regulate the amount of fluid necessary to remove the heat from the refrigeration system, permitting more fluid to flow when load conditions are high and less fluid to flow when load conditions are low. The water regulating valve is designed to begin opening at 180 psi (1240 kPa) and be fully opened at 240 psi (1655 kPa). The valve is factory set and should not need adjustment.
Replacement Procedures Compressor Replacement: Infrequently a fault in the motor insulation may result in a motor burnout (if system is properly installed, motor burnout rarely occurs). Primarily this type of failure is due to mechanical or lubrication problems, where the burnout is a secondary consequence. Early detection can prevent a large percentage of the problems that can cause compressor failures. Periodic maintenance inspections by alert service personnel (i.e.
6.2.6 Steam Generating Humidifier - Operation Procedures Steam generating humidifiers operate efficiently over a wide range of water quality conditions and automatically adjust to changes in the conductivity of water. The system will automatically drain and refill to maintain a current setpoint and alert the operator when the humidifier canister needs to be replaced. The humidifier RUN/DRAIN switch is located in the humidifier assembly.
Replacing the Humidifier Canister The proper procedure to replace the humidifier canister is: 1. Turn off the humidifier by lowering the humidity setpoint below the ambient humidity level. Record the original setpoint. 2. Turn unit off at wallbox. 3. Place the RUN/DRAIN switch in the DRAIN position to drain the water from the canister. 4. Return the RUN/DRAIN switch to the RUN position after the canister has drained. 5. Turn OFF the power at the main unit. 6. Remove the cover from the humidifier cabinet. 7.
7.0 MAINTENANCE INSPECTION CHECKLIST JOB NAME: ______________________________ ROOM TEMP/HUM: ______________________________ SERIAL: ______________________________ DATE: ______________________________ UNIT MODEL: ______________________________ COND. MODEL: ______________________________ FILTERS COMPRESSOR ___ 1. Check/Replace Filters ___ 1. Amp Draw 1. ____ / ____ / ____ ___ 2. Check Filter Switch ___ 2. Amp Draw 2. ____ / ____ / ____ ___ 3. Wipe Section Clean ___ 3.
8.0 TROUBLESHOOTING Table 21 Troubleshooting Symptom Unit will not start No cooling Compressor high head pressure Humidifier does not operate 60 Possible Cause Check or Remedy No power to unit Check voltage at input terminal block. Control voltage fuses (at transformer) open Locate and repair short. Replace fuses. Float switch relay has closed due to high water in the condensate pan. Check drain and line. Access through left panel. Power must be cycled at the disconnect to reset.
Table 21 Symptom Reheat will not operate Troubleshooting (continued) Possible Cause Check or Remedy DIP switch not set to enable reheat option See DIP switch settings Table 20. “HEAT” not displayed at the control panel Increase temperature setpoint to require heating. Reheat safety open, defective reheat contact or defective board Check voltage at P34-4 or P34-6 to P34-10 on interface board for 24 VAC ± 2 VAC. If voltage, check reheat contactor and reheat safety.
® ENVIRONMENTAL CONTROL MINI-MATE2 INSTALLATION, OPERATION & MAINTENANCE MANUAL The Company Behind the Products Technical Support With over a million installations around the globe, Liebert is the world leader in computer protection systems. Since its founding in 1965, Liebert has developed a complete range of support and protection systems for sensitive electronics: United States 1050 Dearborn Drive P.O.
