For 18 SEER R410A Series Unitary Ducted Split AC Thermostat Owner's Manual Commercial Air Conditioners Thank you for choosing MRCOOL, please read this owner’s manual carefully before operation and keep it for future reference. For more information visit www.mrcool.com.
Contents Safety Considerations....................................................................................1 1. Installation of the Wired Controller.............................................................2 2. Wiring Terminals of the Wired Controller....................................................2 3. Main Page..................................................................................................3 4. Function Setting..................................................................
Unitary Ducted Split AC Safety Considerations Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory--authorized kits or accessories when modifying this product.
Unitary Ducted Split AC 1. Installation of the Wired Controller 1 2 3 4 Fig.1 Installation Diagram Step 1: Press the button at the top of the wired controller to remove the front panel and the bottom plate. Step 2: Reinstall the bottom plate in accordance with the locating holes either shown in the figure above or decided by the user. Step 3: Conduct the wiring and see section 2 for more details. Step 4: Reinstall the front panel. 2.
Unitary Ducted Split AC 3. Main Page ① “Fan” ② “Set” Fig.3 Main Page ⑤ “▼” ⑦ “Mode” ④ “ON/OFF” ⑥ “▲” ⑧ “Enter/Hold” ③ “Cancel” 4. Function Setting 4.1 “ON/OFF” The controller can be turned on/off by pressing this button, with the corresponding ON/OFF symbol displayed. Fig.4 3 For more information visit www.mrcool.com.
Unitary Ducted Split AC 4.2 “Mode” One among various mode options can be selected by pressing the “Mode” button ● As for the cooling only unit, the switchover order of mode options is: E-HEATER→COOL. ● As for the cooling and heating unit, the switchover order of mode options is: HEAT→ E-HEATER →COOL Note: the unit type is identified by the main board of the unit. Fig. 5 4.
Unitary Ducted Split AC Fig. 7 4.5 “SET” (Parameters/Functions View and Setting) It is available to go the parameters/functions view and setting page by pressing the “Set” button, and then desired option can be selected by pressing the “▼/▲” button, finally go to the corresponding view and setting page by pressing the “Enter/Hold” button. Fig.8 Parameters/Functions View and Setting 4.5.
Unitary Ducted Split AC 06 Tube Outlet Temperature of the Outdoor Unit 07 Discharge Air Temperature of the Outdoor Unit 08 Preset Frequency 09 Running Frequency 10 IPM Radiator or IPM Temperature ● This page can quit by pressing the “Enter/Hold” button, ● The accumulated “Compressor Runtime” can be cleared by pressing the “Mode” button for five seconds.
Unitary Ducted Split AC “▲ /▼” button. Fig. 11 ② After the day is set, press the “Enter/Hold” button to make a confirmation and then go to the “time period” setting status with the time period blinking and then select the desired one through the ▲ or ▼ button. Fig. 12 ③ After the time period is selected, press the “Enter/Hold” button to make a confirmation and go the setting status for timing the time period with the “HOUR” blinking and adjust it through the “▲ /▼” button.
Unitary Ducted Split AC Fig.14 ⑤ After the temperature under the cooling mode is set, press the “Enter/Hold” button to make a confirmation and go to the setting status for setting the temperature under the heating mode and adjust it through the ▲ or ▼ button. Fig.15 ⑥ After that, press the “Enter/Hold” button to make a confirmation and go back to the page shown in step ② and then repeat the steps ②～⑤ for setting other time periods. Fig.
Unitary Ducted Split AC Note: Only when four time periods have been set and the wired controller has backed to the page for selecting the day X, can the timing parameters be memorized together. If the setting quits or the power failure occurs, then the setting of the timing parameters on the day X comes invalid. 4.5.4 “Func.” Fig.18 ● After going into this page, the function No. blinks and then press the “▼/▲” button to switch the function No. ● Select the desired function No.
Unitary Ducted Split AC Fig.19 4.7 Lock Function This function can be activated by simultaneously pressing the “▼/▲” button for five seconds on the main page, and be canceled by another press. 4.8 Error Display For instance, if the display board ambient temperature sensor error occurs, the error code“F0”and related error symbol will be displayed.
Unitary Ducted Split AC 27 ee Drive Memory Chip Error 28 PU Charging Circuit Error Technical Parameters ● Power Supply: 24V AC 50/60HZ ● Maximum Current: 1.5A ( Sensing Load ) ● Working Environment: Only applicable to indoor environment ● Working temperature: )～ ) ● Displayed Environment Temperature: 32F～ ) When the environment temperature is lower than 32F , the displayed value will be “LO”, When the environment temperature is higher than ) , the displayed value will be “HI”.
Unitary Ducted Split AC 5.1.2 Indoor Unit C E D A B Fig. 21 Indoor Unit Diagram Table 7-Dimension of Indoor Unit Unit: Inch Model MAH18024 MAH18036 MAH18042 MAH18048 A 21" 21" 24-1/2" 24-1/2" B 21-5/16" 21-5/16" 21-5/16" 21-5/16" C 10-3/4" 12-1/4" 13-3/4" 13-3/4" D 11-5/16" 11-5/16" 11-1/2" 11-1/2" E 43-1/2" 48-3/16" 48-3/16" 48-3/16" 5.2 Installation Recommendations NOTE: In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment. 1.
Unitary Ducted Split AC refrigerant charge good for 25 ft. For proper unit operation, check refrigerant charge using charging information located on control box cover and/or in the Check Charge section of this instruction. NOTE: Avoid contact between tubing and structure INDOOR WALL OUTDOOR WALL CAULK LIQUID TUBE VAPOR TUBE INSULATION THROUGH THE WALL JOIST HANGER STRAP (AROUND VAPOR TUBE ONLY) INSULATION VAPOR TUBE 1”MIN. SUSPENSION LIQUID TUBE Fig.22 Connecting Tubing Installation 5.
Unitary Ducted Split AC 5.3.5 Elevate Unit CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation. Unit must be kept free of an accumulation of water and/or ice in the basepan. Elevate unit per local climate and code requirements to provide clearance above estimated snowfall level and ensure adequate drainage of unit. If using accessory support feet, use installation instructions from kit for installation. 5.3.
Unitary Ducted Split AC Winter Start Control Yes No Accumulator No No No No Motor Master Control Yes No No Support Feet Recommended No Recommended Table 9—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters(In.
Unitary Ducted Split AC Leak Testing Leak test all joints indoors, outdoors, and refrigerant tubing. Evacuate Refrigerant Tubing and Indoor Coil CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Never use the system compressor as a vacuum pump. Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns.
Unitary Ducted Split AC Triple Evacuation Method The triple evacuation method should only be used when vacuum pump is only capable of pumping down to 28 inch of mercury vacuum, and system does not contain any liquid water. Refer to Fig. 25 and proceed as follows: 1. Pump system down to 28 inch of mercury and allow pump to continue operating for an additional 15 minutes. 2. Close service valves and shut off vacuum pump. 3.
Unitary Ducted Split AC 5.3.7 Make Electrical Connections NOTE:The signal line of the wired controller must be separated from the power line and the connecting line between the indoor unit and the outdoor unit. WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Do not supply power to unit with compressor termial box cover removed.
Unitary Ducted Split AC Wiring Diagram: OUTDOOR UNIT SYMBOL XT1/XT2 AP L1/L2 COMP M C EKV HP LP SAT RT1 RT2 RT3 NAME TERMINAL BOARD MAIN PCB INDUCTOR COMPRESSOR FAN MOTOR FAN CAPACITOR ELECTRONIC INFLATE VALVE HIGH PRESSURE SWITCH LOW PRESSURE SWITCH COMP. OVER LOAD COMP. TEMP. SENSOR ENVIRONMENT TEMP. SENSOR DISCHARGE GAS TEMP. SENSOR Fig.
Unitary Ducted Split AC Fig. 28 Electric Wiring of the Outdoor Unit(MAC18048) 5.3.8 Start-Up CAUTION UNIT OPERATION AND SAFETY HAZARD Failure to follow this caution may result in minor personal injury, equipment damage or improper operation. To prevent compressor damage or personal injury, observe the following: Do not overcharge system with refrigerant. Do not operate unit in a vacuum or at negative pressure. Do not disable low pressure switch in scroll compressor applications.
Unitary Ducted Split AC CAUTION ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage. Federal regulations require that you do not vent refrigerant to the atmosphere. Recover during system repair or final unit disposal. Follow these steps to properly start up system: 1. After system is evacuated, fully open liquid and vapor service valves. 2. Unit is shipped with valve stem(s) closed and caps installed.
