Precision Cooling For Business-Critical Continuity™ Liebert Mini-Mate2™ User Manual - 8 Tons, 50 & 60Hz
TABLE OF CONTENTS MODEL NUMBER NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V 1.0 PRODUCT FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 1.1 Standard Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 1.1.2 1.1.3 1.2 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation. . . . . . . . . . . . . . . . . . . . . . 27 2.7.1 2.7.2 2.7.3 2.8 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.3.1 4.3.2 4.4 Electric Reheat - Staged. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 SCR Electric Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 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 Figure 26 System configurations—air cooled systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 System Configurations—water/glycol systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODEL NUMBER NOMENCLATURE Evaporators and Chilled-Water Units MMD96E-AHEL0 (example) MM D 96E- A H E L 0 Indoor Condensing Units MCD96ALA00 (example) Mini-Mate2 MC 0 = No Disconnect D = Disconnect 96E- = 8-ton Evaporator, 60 Hz 95E- = 8-ton Evaporator, 50 Hz 8TCD = 8-ton Chilled-Water w/ 2-way valve 8TCT = 8-ton Chilled-Water w/ 3-way valve A = 460V-3ph-60 Hz B = 575V-3ph-60 Hz C = 208V-3ph-60 Hz D =230V-3ph-60 Hz M = 380/415V-3ph-50 Hz 0 = No Humidifier H = Humidifier 0 = No Reheat E= Electric Reh
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Product Features 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.
Product Features 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.
Product Features 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.
Site Preparation and Installation 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.
Site Preparation and Installation 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.
Site Preparation and Installation Figure 1 System configurations—air cooled systems Evaporator Prop Fan Condensing Unit Evaporator Centrifugal Fan Condensing Unit Figure 2 System Configurations—water/glycol systems Cooling Tower WATER-COOLED SYSTEMS Evaporator Water/Glycol Condensing Unit GLYCOL-COOLED SYSTEMS Drycooler Evaporator Water/Glycol Condensing Unit 6
Site Preparation and Installation Figure 3 System Configurations—chilled water systems COUPLED COMPONENTS (AIR-COOLED SYSTEM Evaporator CHILLED-WATER SYSTEMS Evaporator Condensing Unit Condensate Pump Condensate Pump 2.2 System Weights Table 4 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.
Site Preparation and Installation 2.4 Installing the Evaporator or Chilled-Water Units ! WARNING Be sure the supporting roof structure is capable of supporting the weight of the unit(s) and the accessories during installation and service. (See 2.2 - System Weights.) Be sure to securely anchor the top ends of the suspension rods. Make sure all nuts are tight. The evaporator unit and indoor condensing unit are usually mounted above the ceiling and must be securely mounted to the roof structure.
Site Preparation and Installation 2.4.1 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 5). If Single Point Power Kit is used, install the box into the evaporator prior to suspending the units. Route power wire flex conduit into condensing unit as units are suspended. Refer to instructions supplied with kit for details. Align bolt holes in the condensing unit and in the evaporator.
Site Preparation and Installation 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.
Site Preparation and Installation 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.
Site Preparation and Installation 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 7 Condensate pump installation 3/8" Compression Fitting Drain Connection Power Supply from Electric Service Power Block in Fan/Coil Module.
Site Preparation and Installation Chilled-Water Piping—Chilled-water Systems Only Refer to Figure 8 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.
Site Preparation and Installation 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.
Site Preparation and Installation 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 7 8-ton unit refrigerant charge Evaporator Charge (ounces) Model No.
Site Preparation and Installation Figure 10 Evaporator or chilled-water unit dimensional data Customer Supplied threaded rods for module support from ceiling (1/2" minimum diameter recommended) (typ. 4). 54 1/8 " (1375mm) CABINET DIMENSION 2" (50.8mm) 1 3/16 " (30.2mm) 15 5/8 " (397mm) Air Outlet 9/16" (14mm) dia. holes for threaded rods (typ. 2 each end) 12 1/8 " (308mm) 16 13/16 " (427mm) Air Inlet 26 1/2 " (673mm) 19 1/2 " (495mm) FRONT OF UNIT 1 " (25.
Site Preparation and Installation 2.4.4 Electrical Connections, Evaporator or Chilled-Water Unit ! WARNING ! WARNING Unit contains hazardous electrical voltage. Disconnect power supply before working within. Line side of factory disconnect remains energized when disconnect is off. 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.
Site Preparation and Installation Figure 11 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. Drycooler/Circulating Pump Control Circuit TB70-71.
Site Preparation and Installation 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.
Site Preparation and Installation 2.5.3 Piping Connections Details for refrigerant (R-22) loop piping are in 2.4.3 - Piping Connections and Coolant Requirements.
Site Preparation and Installation Figure 13 Indoor air-cooled centrifugal condensing unit dimensions and pipe connections 66 9/32 " (1683.5mm) CABINET DIMENSION Customer supplied threaded rods for module support from ceiling (1/2" minimum diameter recommended) (typ. 4).
Site Preparation and Installation Figure 14 Indoor air-cooled centrifugal condenser electrical connections Field Supplied Unit Disconnect Switch when Factory Unit Disconnect Switch is not Supplied. Electric Service not by Liebert. Line VoltageElectric Power Supply Conduit. Removable Access Panels Connection Terminal for Field Supplied Earth Grounding Wire. Optional Factory Installed Disconnect Switch. Openings for Field Supplied 24V NEC Class 2 Wiring Between Condensing Unit and Fan/Coil Unit. .
Site Preparation and Installation 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.
Site Preparation and Installation Figure 15 Electrical field connections - outdoor condensing unit Field supplied unit disconnect switch. Single or three phase electric service not provided by Liebert. Field supplied 24V NEC class 2 wiring to evaporator module. Electric service connection to contactor or terminal block. Factory wired to components on electric panel. Single or three phase electric service not provided by Liebert. High voltage electric power supply entrance. Heat rejection connection.
Site Preparation and Installation Figure 16 Footprint dimensions - outdoor condensing unit GUARD HEIGHT TOP AIR DISCHARGE D RIGHT AIR INTAKE B LEFT AIR INTAKE SHADED AREA INDICATES A RECOMMENDED CLEARANCE OF 18" (457mm) FOR PROPER AIR FLOW 2 " (51mm) A SHADED AREA INDICATES A RECOMMENDED CLEARANCE OF 18" (457mm) FOR PROPER AIR FLOW C SHADED AREA INDICATES A RECOMMENDED CLEARANCE OF 24" (610mm) FOR COMPONENT ACCESS AND REMOVAL REMOVABLE FRONT PANEL FOR ACCESS TO HIGH VOLTAGE & LOW VOLTAGE CONNECTI
Site Preparation and Installation Figure 17 Piping and electrical connections - outdoor condensing unit SL-11081Page7 Model Numbers Electrical Connections In. (mm) Piping Connections In.
Site Preparation and Installation 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.
Site Preparation and Installation Figure 18 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.
Site Preparation and Installation Figure 19 Indoor water/glycol condensing unit electrical field connections 29
Site Preparation and Installation Figure 20 System piping with indoor water/glycol-cooled condensing unit Two circuits provided. Single circuit shown.
Site Preparation and Installation 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.
Site Preparation and Installation Figure 22 Optional free cooling coil (3-way valve) on air-cooled units SL-11088Pg12 32
Site Preparation and Installation 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.
Microprocessor Control 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.
Microprocessor Control 3.2 Main Menu
Microprocessor Control 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.
Microprocessor Control 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 backedup. 3.8 Date The controller date must be set to allow for setback control.
Microprocessor 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.
Microprocessor Control 3.10.7 CW Flush (For Systems With a Modulating Chilled-Water Valve) This function shows the interval time at which the system will perform a modulating chilled-water valve system flush cycle. The factory default is 24 (hours) and is programmable from 0 (hours) which signifies to never flush, to 99 (hours) which signifies to flush after every 99 hours of valve non-use. If the valve is called on by the control to open within the programmed interval time, the timer will be reset to 0.
Microprocessor Control 3.14 Alarm Time Delay Each individual alarm can be programmed with a time delay (Table 13), 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.
Microprocessor Control 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.
Microprocessor Control 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.
Microprocessor Control 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.
Microprocessor Control Figure 25 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 26 Wall box board TB3-1 TB3-2 TB3-3 TB4-4 Wall Box DIP Switches (1-8) 44
System Performance Microprocessor Controls 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.
System Performance Microprocessor Controls 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.
Alarms 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.
Alarms 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.
Alarms 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.
System Operation, Testing, and Maintenance 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.
System Operation, Testing, and Maintenance 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.
System Operation, Testing, and Maintenance 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.
System Operation, Testing, and Maintenance 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).
System Operation, Testing, and Maintenance 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.
System Operation, Testing, and Maintenance 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.
System Operation, Testing, and Maintenance 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.
Maintenance Inspection Checklist 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.
Troubleshooting 8.0 TROUBLESHOOTING Table 18 Troubleshooting Symptom Unit will not start No cooling Compressor high head pressure Humidifier does not operate Reheat will not operate 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.
Troubleshooting Table 18 Troubleshooting (continued) Symptom Cooling cycle too short Possible Cause Check or Remedy Sensor response delay too short Increase sensor response delay. See 3.12 - Calibrate Sensors. Display freezes and control pads do not respond Static discharge During period of low humidity, static electricity can cause the control program to freeze or display incorrect information. Although this is unlikely, the control can be reset by cycling power from the disconnect switch.
Troubleshooting NOTES 60
Troubleshooting 61
Troubleshooting 62
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