System Introduction � MWH-C Inside Structure (packaged type) Air side exchanger Four-way valve Fan Compressor Water side exchanger Control box Page 47
System Introduction 1. Water Loop System 2. Ground Water System 3. Surface Water System 4. Ground Coupled System Page 48
System Introduction 1.Water Loop (summer operation ) ) Air Cooling tower Expansion separator ON tank Pumps Plate-and-frame heat exchanger 32ºC [90ºF] Boiler OFF Heat pumps in cooling mode Heat pumps Page 49
System Introduction 1.Water Loop (winter operation ) ) Cooling tower OFF 16ºC Boiler ON [60ºF] Heat pumps in heating mode Page 50
System Introduction 1.Water Loop (Spring and Fall Operation) Cooling tower OFF Boiler OFF Heat pumps in Heat pumps in heating mode cooling mode Page 51
System Introduction 2.Ground Water - Water from well - Drained back to well, drain, stream or lake - Stable throughout the year - Limited by availability of water table and aquifers in the ground Page 52
System Introduction 3.Surface Water - Open or close loop - Open – water being returned back to source or drain - Closed – water being re-circulated in the closed loop - Stable throughout the year Page 53
System Introduction 4. Ground Coupled - HE is buried into the earth - Installation cost is high - Massive & stable thermal capacity Page 54
Benefits of a Water Source System � Heat recovery offers energy savings � Individual space control � Performs both cooling and heating � Small amount of floor space required � Unit failure does not affect the rest of the system � Higher Energy Efficiency Rating if compared to Air Cooled System Page 55
Advantages of Water Source System Page 56
Benefits of a Water Source System � Supply Cooling and Heating simultaneously 25 ℃ 30 ℃ 25 ℃ 20 ℃ Heat Cool Heating Cooling Mode Mode Page 57
Benefits of a Water Source System � Individual space control � Small amount of floor space required Page 58
Benefits of a Water Source System � Higher Energy Efficiency Rating if compared to Air Cooled System Water Cooled 4 3.5 Air Cooled 3 2.5 2 Electric Heater 1.5 1 0.5 0 EER Comparison The illustrated EER does not represent actual EER of MWH-C series. For more Page 59 accurate EER, please refer to technical manual.
Benefits of a Water Source System � Independent Metering Page 60
Benefits of a Water Source System � Installation Flexibility � No special AHU room is required. � Can be ceiling concealed, space saving � Additional unit can be installed for office extension purpose. Page 61
Introduction MWH-C Page 62
Manufacturing Process 1 Coil, second panel & coil assembly Coil, second panel & coil assembly 2 Compressor and tube in tube assembly Compressor and tube in tube assembly 1 2 3 Automatic vacuum Automatic vacuum 4 Auto- Auto -Charging Machine Charging Machine 3 4 Page 63
Manufacturing Process Auto- -charging process (according to model) charging process (according to model) 5 5 Auto Fan motor assembly 6 6 Fan motor assembly 7 7 8 8 Refrigerant Leak Test station Leak test equipment (Halogen leak test) Refrigerant Leak Test station Leak test equipment (Halogen leak test) Page 64
Manufacturing Process 9 Leak test station Work Instruction Leak test station Work Instruction 9 Leak test station Work Instruction 10 10 Leak test station Work Instruction 11 12 11 12 Functional Test Supply Air Temperature Functional Test Supply Air Temperature Page 65
Manufacturing Process Power Supply Power Supply 13 Room Temperature Room Temperature 13 14 14 15 16 15 16 Condensing Pressure Handset Operation Condensing Pressure Handset Operation Page 66
Manufacturing Process 17 Air purging (to clean the water left in Air purging (to clean the water left in 17 Quality Check Data Card (kept by factory for 18 18 Quality Check Data Card (kept by factory for system) system) 5 years) 5 years) 19 20 19 20 Packing Quality Control Certification Packing Quality Control Certification Page 67
HORIZONTAL WATER COOLED PACKAGE � Package Type Horizontal unit, MWH- - C series Page 68
Nomenclature MWH008CR02R-ABAE 02 = 15Pa 03 = 30Pa 05 = 50Pa 08 = 80Pa S td pipe connection = right. Left piping spec is not available now. Page 69
Product Lineup � 13 Models, capacity: 2.5~20 kW � Low height, suitable to be ceiling concealed Model Capacity Dimension (L*W*H) Outline MWH008C/ CR 2.5 875*520*373 MWH010C/ CR 3.0 875*520*373 MWH013C/ CR 3.7 875*520*373 MWH015C/ CR 4.4 875*520*373 MWH020C/ CR 5.8 1236*651*436 MWH025C/ CR 6.8 1236*651*436 MWH028C/ CR 8.1 1242*744*365 MWH030C/ CR 8.9 1242*744*365 MWH040C/ CR 12.4 1300*794*434 MWH050C/ CR 12.6 1300*790*500 MWH060C/ CR 14.9 1300*790*500 MWH065C/ CR 17.7 1300*790*500 MWH070C/ CR 20.0 1300*790*500 Page 70
Basic Construction S upply Air Blower Leaving Water S ensor Compressor S ervice Panel Return air sensor S ervice panel OD Coil S ensor Return air S ervice Controller panel box Page 71
Components detail Blower Type C o m p r e s s o r Model Type Model Qty Blower Type Fan Motor 008C 2P14S225ANC 1 SYZ7-5II YDK20-6AD3(1.2uF) 010C 2P17S225ANA 1 SYZ7-5II YDK40-4I3(2.5uF) 013C 2P20C225BNG 1 SYZ7-5II YDK40-4I3(3.5uF) 015C 2K23S225AHA 1 SYZ7-5II YDK40-4I3(5uF) 020C TH310VEEC 1 SYZ7-7I YDK90-4A6(6uF) Rotary 025C TH365VEEC 1 SYZ7-7I YDK145-4A6(6uF) 2P20C225BNG 028C 1+1 SYP200-190J-3 YDK220-4A8(7.5uF) 2K23S225AHA 030C 2K23S225AHA 2 SYP200-190J-3 YDK220-4A8(7.5uF) 040C TH310VEEC 2 SYZ10-10II YDK180-6B8(7.5uF) 050C JT125BCBY1L 1 SYZ10-10II YDK600-4F8(25uF) 前出风 侧出风 060C JT160BCBY1L 1 SYZ10-10II YDK600-4F8(25uF) Scroll 065C ZR72KC-TFD-522 1 SYZ10-10II YDK600-4F8(20uF) 070C ZR81KC-TFD-522 1 SYZ10-10II YDK600-4F8(25uF) Page 72
Product Features Page 73
侧出风 side Site convertible Air Discharge Direction front 前出风 Convertible Air Throw MWH008~070C(R) Page 74
Double Isolation Panel - Reduce noise and vibration transmission Compressor Upper panel Lower panel Page 75
Wide Operating Range To refer to TM. Include air limit too. Allowable Entering Water Temperature ( ° C) Cooling model Heating model 30 20 20 16 27 35 16 30 Indoor DB ( ° C) Page 76
Part Loading Capability � Only available for model MWH028/ 030/ 040C/ CR � 2 stage loading capacity at 50% ~ 100% � Less noise during low load condition 100 Comp. Loading % 50 0 2 Step Capacity, Two compressors Page 77
Auto Random Restart � S et at handset dip switch. To have Auto Random Restart, Dip Switch 2 set to ON Page 78
Controller Page 79
Extension board Extension board compressors system Connection cable （ std = 10m ） Board Board Ext board for 2 MC120 MC120 Main Main ※ remark: only. Hanset Page 80 Wireless controller, Wireless controller, Std handset, MC301 Std handset, MC301 optional optional
Connection network j umper MC120 mainboard Medium fan HEAT/ AS : n/ a High fan Low fan L,N: 5V/12V Power line WP: JP: MF: HF: LF: COM9: 220V n/ a To ext board 220V 4WV: COM: Common output for E1, E2, E3 OF: Water valve E1: Flow switch L,COMP: Comp Out E2: LP S W2: E3: Dip switch HP S W1: Dip switch LS : 5V 12V 5V/12V 接水位开关 COM7: COM8: To MC301 To ext board TH1: 5V Return air TH2: 5V 5V TH3: 5V COM5: sensor Leaving water Coil temperature To connect to MC303, Temperature sensor sensor centralized controller Page 81
Connection COM: 220V 220V MC120 ext .board Common output for E1, E2, E3 To 4WV OUT1: E1: n/ a E2: LP2 E3: LP3 TH2: 2 nd system LWT sensor 5V TH1: 5V L,COMP: Coil 2 temp sensor power line & To compressor 5V/12V COM8: COM9: 5V/12V To mainboard To mainboard Page 82
Remote controller (optional) Wire controller � Control panel MC301 Page 83
MC120 Function - MODE: Cooling only: COOL/AUTO /FAN; - Heat pump: COOL/HEAT/AUTO/FAN Temperature setting range: 16-30 ° C (61-86 ° F) - - TIMER setting - SLEEP function (COOL/HEAT/AUTO) - LCD for displaying the temperature setting, mode setting, real time & ON/OFF - Auto-restart after power failure (default: OFF) - Compressor restart, overload protection - Water temperature detection - Gas Leak protection - Indoor coil antifreeze protection (COOL/DRY) - Self diagnosis - Networking compatible with MC303. Page 84
Protection Logic Page 85
Protection 1. Compressor ON/OFF Protection In any case of power failure, compressor will take 1 minutes after power is resumed to restart. 2. Minimum 4 minutes compressor run time 3. Minimum 3 minutes compressor shut down time 4. Internal Compressor Overload Protection 5. During heating mode, indoor coil over heat protection Page 86
Protection 6. During cooling mode and compressor run for at least 10 minutes, if indoor coil temperature is =<0 ° C for 1 minute, indoor fan will run at High speed and compressor will cut out, After 5 minutes, if indoor coil temperature >5 ° C, indoor fan will follow user set speed. if indoor coil is within 0-5 ° C, indoor fan will remain at High speed. Compressor will cut in, if; - Compressor has been cut out for 3 minutes and indoor coil temperature =>12 ° C for 1 minute. Page 87
Protection 7. Gas Leak Detection During cooling mode, after compressor run for 5 minutes, if Tid>= Tr-3 ° C, alarm will be activated. If alarm continue for 5 minutes, compressor and indoor fan will cut out. ( for 2 compressor system, 1 system indoor fan will continue to run ). If condition turns better within 5 minutes, alarm will be deactivated. Else, system will need to restart manually to clear the alarm. Page 88
Protection 7. Gas Leak Detection (continue) During heating mode, after compressor run for 5 minutes, if Tid>= Tr+3 ° C, alarm will be activated. If alarm continue for 5 minutes, compressor and indoor fan will cut out. ( for 2 compressor system, 1 system indoor fan will continue to run ). If condition turns better within 5 minutes, alarm will be deactivated. Else, system will need to restart manually to clear the alarm. Page 89
Operation Basic Page 90
MWH-C control � Operation - Set “auto-restart after power failure” the unit will recover to the status before power failure - Temperature setting: use “ Δ ” or “ ▽ ” keyboard to increase or decrease by 1 ° C or 1 ° F, temperature range is 16-30 ° C (61-86 ° F ) Page 91
MWH-C control � Operation - Week timer setting: Include total 28 on/off timers, 7 days every week and 4 timers every day. - Single timer setting: It is active only on the same day that timer set when power on. It is inactive when timer is set at AM 00:00. It can be set at AM 00:00 if you want to cancel some timer setting. - Press “FAN” and “MODE” at one time, all timers setting can be canceled. Page 92
MWH-C Control � Operation - Press “MODE” key, the current mode is twinkling. The mode is changed when “MODE” is pressed. The mode changes as follows: - Heat pump:COOL → HEAT → FAN → DRY → COOL Cooling only: COOL → FAN → DRY → COOL Page 93
MWH-C control � Error code and Troubleshooting Error code Causes E1 Compressor2 low pressure faulty E2 Compressor2 high pressure faulty E3 Compressor2 overload E4 System 2 coil temperature sensor open or short E5 Leaving water temperature 2 faulty F2 System 1 coil temperature sensor open or short F4 Return air temperature sensor open or short F6 Communication faulty F9 Compressor1 refrigerant let out FE Compressor2 refrigerant let out H1 Compressor1 overload H4 Compressor1 high pressure faulty L1 Compressor1 low pressure faulty L3 Temperature of water entering too high or low L4 Water flow switch faulty L5 Leaving water temperature 1 faulty Page 94
Centralize Controller Page 95
MWH-C control � MC303 panel outlook. � Enter : confirm setting � Timer: � Setup: � Fan: � Swing: not applicable � Heater: not applicable � Mode: � Unit no: � Sleep: Page 96
32 units MWH MWH MWH MC301 MC301 MC301 Centralized-control (option) MWH MWH MWH � Use MC303 controller MC301 MC301 MC301 MC303 Page 97
MC303 Features � The central controller is only applicable to Digital Variable Multi system and the air condition system of the MC120 main board used. � Group units operation setting: temperature, mode, fan speed, sleep for 32 units at the same time. � Group units ON / OFF: turn on or off all units � Group Timer ON/ OFF. Timer setting for MC301 and MC303 is set. S ystem to follow the last setting. � Auto display one by one status when in standby mode. Page 98
MC303 Features � S ingle unit operation setting: on/ off, temperature, mode, fan speed, sleep. � Timer setting: timer on/ off all units. � Display Circularly : display each unit temperature, mode, fan speed, running mode and fault code one by one. � Real time clock: After the system power failure, the spare battery keep the time continues to run. � Page 99
Wiring Connection � Networking cable: shielded twisted RS 485 Come with MC303 AC:220V~50Hz MC303 1# INDOOR UNIT 2# INDOOR UNIT N# INDOOR UNIT(n<=32) POWER MC120 MC120 MC120 ADAPTOR B COM15 B COM15 B COM15 A A A A NOTE: For the final unit, please close jumper JP on main board. Std setting is closed. Page 100
Unit Address Setting Unit No Page 101
Controller Setting � Press “ setup” for 5s, LCD will detect the available indoor add. � Check by press “ Mode” for 5s, all detected unit add will be displayed, press up and down key to check one by one if there is any error. � S elect particular unit, Press “ unit no” , and press up and down to select the desired unit add. � Default value: 24degC, Auto mode, high fan speed, no sleep, no swing and no heater. � Lock function: press sleep for 5s, upper right of LCD show “ lock” . Press again sleep for 5s, unlock the unit. Page 102
Control Setting � Group control: press unit no, select” --” , LCD unit no will flash, group control is activated. ] � Group ON/ OFF: press ON/ OFF button for 5s, unit no will flash, show “ [ ]” . Can on or off all units. � Disable Group control: press sleep for 5s if the unit add is “ --” � ° C and ° F: Handset dipswitch ON = ° C, default = off = ° C. However, if press “ fan” for 5s, can switch over. � Timer = 4 ON/ OFF timer / days. Cancel timer, press “ timer” for 5s. Page 103
Maintenance Page 104
Maintenance � Normal maintenance on all conditioners is generally limited to filter changes. Lubrication of the fan motor is not required. � Filter changes are required at regular intervals. The time period between changes will depend upon the proj ect requirements. S ome applications such as motels produce a lot of lint from carpeting and linen changes. It is suggested that the filter be checked at 60-day intervals for the first year until experience is acquired. If light cannot be seen through the filter when held up to sunlight or a bright light, it should be changed. A more critical standard may be desirable. � The condensate drain pan should be checked annually and cleaned and flushed as required. Page 105
Maintenance (cont… ) � Records of performance measurements of volts, amps, and water temperature differences (both heating and cooling) are recommended. A comparison of logged data with start-up and other annual data is useful as an indicator of general equipment condition. � Periodic lockouts always are caused by air or water problems. The lockout (shutdown) of the conditioner is a normal protective result. Check for dirt in the water system, water flow rates, water temperatures, airflow rates (may be dirty filter), and air temperatures. If the lockout occurs in the morning following a return from night setback, entering air below machine limits may be Page 106 the cause
Trouble Shooting Page 107
Troubleshooting-1 (No power supply) 1. Neither fan nor compressor runs � The fuse may be blown or the circuit Breaker is open. Check electrical circuits and motor windings for shorts or grounds. Investigate for possible overloading. Replace fuse or reset circuit Breakers after fault is corrected. � Wires may be loose or broken. Tighten or replace. � S upply voltage may be too low. Check it with the power company. � Control system may be faulty. Check thermostat for correct wiring and check 24 volt transformer for burnout. Page 108
Troubleshooting-2 2. Fan runs but compressor does not run � Check compressor capacitor. � Wires may be loose or broken. Tighten or replace. � The high pressure switch may have tripped due to: a) Fouled or plugged condenser; b) Lack of or no condenser water; c) Too warm condenser water; d) Not enough airflow over the coil due to dirty filters; Page 109
Troubleshooting-2 (cont… ) 2. Fan runs but compressor does not run � Check thermostat setting, calibration and wiring. � The compressor overload protection is open. If the compressor dome is extremely hot, the overload will not reset until cooled down. If the overload is external, replace it. If the overload is internal, replace the compressor. � The compressor winding may be open. Check continuity with ohmmeter. If the winding is open, replace the compressor. Page 110
Troubleshooting-3 3. Compressor attempts to start but is not successful � Check continuity for contactor � High pressure trip check � High superheat results in high discharge temperature � Lack of refrigerant Page 111
Troubleshooting-4 4. Compressor stops after short run � Check thermostat setting. � Check system pressure � refer to troubleshooting-3 possible causes. Page 112
Troubleshooting-5 5. Insufficient cooling or heating � Check thermostat setting. � Airflow may be insufficient. Check and clean the filter. � The reversing valve may defects, creating a bypass of refrigerant. If the unit will heat, check the reversing valve coil. � Check capillary tubes for possible chock of refrigerant flow. � Check if any block in water flow or if the water is dirty � Lack of refrigerant Page 113
Troubleshooting-6 6. Insufficient water flow through condenser (tube in tube) � Check whether valves are opened. � Check for air is trapped in piping � Check circulating pumps. � Check if correct water pump sizing Page 114
Troubleshooting-7 7. Water dripping � Check condensate drain. � Check for dirty filter. � Check to see if condensate drain runs uphill. � S ee if blower motor is up to speed. � Check for blower position. � Are drain pipe properly trapped? Page 115
Troubleshooting-8 8. Noisy unit operation � Check for fan wheel whether it is hitting the housing. � Check if any dented fan wheel. � Check if there is loose fan wheel on shaft. � Check if any tubing is touching the compressor. Readj ust tubing by bending slightly. � Check all screws on panels. � Check water flow rate. Page 116
Installation Guidelines Page 117
MWH-C Installation � Pipe installation – U trap required � The condensate disposal piping must have a trap and the piping must be pitched away from the unit not less than 1/ 4" inch per foot (20mm per meter).A piece of single hose from the trap to the drain line is used for simple removal. O ptional Cleanout H L J 1/4" Per Foot (21m m Per M eter) Page 118
MWH-C Installation � Flexible hose - recommended - Since hose may change in length from +2% to – 4% - Absorb unit vibration Page 119
MWH-C Installation � Spring Isolator - required - It is recommended the unit be mounted with spring mounting kit supplied as an optional item. S pring isolator kit is offered as an optional from factory Page 120
MWH-C Installation � Tilt Angle - Factory recommends to tilt the unit up by 1 degC (as shown below) in order to have better drain water flow. - Caution: By tilting the unit, duct connection alignment might be affected, thus, use of flexible duct is highly recommended. Page 121
Duct and attenuation � discharge ductwork is normally used with these conditioners. Return air ductwork may also be required, but will require field installation of a 1" or 2" return air duct collar/ filter rack kit � return air duct should be internally lined with acoustic insulation for sound attenuation � Don't use sheet metal screws directly into the unit cabinet for connection of supply or return air ductwork, especially on return air ductwork which can damage the drain pan or the coil & tube. Page 122
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