Wall Mounted J series PCB Algorithm WMJ PCB

Wall Mounted J series PCB & Algorithm WM-J

PCB Layout WM-J (10/15) WM-J

PCB Connection Diagram (WM-J) Outdoor coil sensor Indoor coil sensor + CN_DISP LED Display Board IR Receiver CN 3 AS motor 4 WV OD fan Fan motor WM-J

Content 1. Features 2. Operating Modes 3. Protections WM-J

1. Features 1. 1 Mode Selection 1. 2 Power Up Settings 1. 3 Unit ON / OFF 1. 4 Temperature Range and Settings 1. 5 Sleep Function 1. 6 Indoor Fan control 1. 7 Louver Control 1. 8 Fan Speed Selection 1. 9 Turbo Function 1. 1. 0 Silent Function WM-J

1. Features 1. 1 Mode Selection Modes can be selected via the value of resistor RMODES AP EC AUTO X COOL X X X : Modes Available WM-J DRY X X FAN X X HEAT DEFROST RMODE X C 2. 4 version 7. 5 k open

1. Features 1. 2 Power Up Settings • The system is configured to memorize settings prior to power down • System will save updated settings into memory 10 seconds after changes are confirmed • However, it will take 3 seconds to update memory if unit changes from on to off state WM-J

1. Features 1. 3 Unit ON / OFF 3 ways to turn on / off the system: (a) On/Off Triggering • Emergency On/Off Button - System mode setting will rotate in the following sequence AP …. >OFF>AUTO (25°C, AUTO FAN)>OFF>…. . EC …. >OFF>COOL (25°C, AUTO FAN)>OFF>…. . • On/Off button on wired (not applicable at the moment) / wireless controller WM-J

1. Features 1. 3 Unit ON / OFF (b) Delay timer • Pressing the On/Off will reset the timer to 0 hour (not applicable at the moment) (c) Real time On/Off Timer • Based on internal real time clock • The timer settings are kept so that similar switches can occur 24 hours later • If emergency ON/OFF switch being press, then the timer will be deactivated Operation ON/OFF LED and buzzer respond in different way during mode change WM-J

1. Features 1. 4 Temperature Range and Settings • operating temperature range is 16°C to 30°C • temperature setting is allowed in COOL, DRY, HEAT and AUTO modes WM-J

1. Features 1. 5 Sleep Function • Only available for COOL, HEAT & AUTO mode • This function will increase 2°C(cooling mode) or decrease 3°C (Heating mode) of the set temperature with time • Change to another modes will inhibit SLEEP function and reset the timer WM-J

1. Features 1. 5 Sleep Function (Cool Mode) WM-J

1. Features 1. 5 Sleep Function (Heat Mode) WM-J

1. Features 1. 6 Indoor Fan Control • Indoor fan speeds are SILENT, LOW, MED, HIGH, TURBO or AUTO FAN in COOL and HEAT modes • In FAN mode, only HI, MED and LO speeds are allowed WM-J

1. Features 1. 7 Louver Control • • • Stepper motor will only run when indoor fan runs Louver is set at max. closing position when unit is turned off If unit switches from OFF mode to ON mode, the louver will stop at the last position when it goes from ON to OFF mode. WM-J

1. Features 1. 8 Fan Speed Selection • • In COOL and HEAT, the indoor fan speeds are SILENT, LO, MED, HIGH, TURBO or AUTO FAN In FAN mode, only HI, MED and LO speeds are allowed WM-J

1. Features 1. 9 Turbo Function • • Available in COOL and HEAT modes When Turbo function is set, indoor fan will force to Turbo fan for 20 minutes and working temperature for - Cooling Cycle is offset Ts – 2˚C - Heating Cycle is offset Ts + 2˚C • If Turbo & Sleep function are activated at the same time, Sleep mode timer will reset until Turbo function is clear WM-J

1. Features 1. 1. 0 Silent Function • • Available in COOL and HEAT modes only When Silent function is set, indoor fan will force to Silent fan WM-J

2. Operating Mode 2. 1 Cool Mode 2. 2 Dry Mode 2. 3 Fan Mode 2. 4 Heat Mode 2. 5 Defrost Mode 2. 6 Auto Mode 2. 7 Off Mode WM-J

2. Operating Modes Cold Start • • • Cold start if: Units restarts 2 hours after it has stopped OR during power-on reset start Not available in sleep mode, only available in heat and cool mode In cooling mode, offset temperature is -2°C In heating mode, offset temperature is +2 After 20 minutes running or compressor cut-off (whichever earlier), cold start will be terminated and resume to user setting WM-J

2. Operating Modes 2. 1 Cool Mode • Compressor will cut in if Tr – Ts > 0. 5˚C • Compressor will cut out if Tr < Ts – 1. 0˚C Note: Tr = Room Temperature Ts = Set Temperature WM-J

2. Operating Modes 2. 2 Dry Mode During the 1 st 12 minutes of the DRY mode run from: i) Cold start OR ii) Mode change from HEAT, FAN or AUTO HEAT • • DRY mode must run under COOL mode with Auto Fan Speed for 12 minutes OR Run Until Tr < Ts – 1°C After the 1 st 12 minutes • DRY mode will run either Zone A, B, C or D (depend on temp. condition) WM-J

2. Operating Modes 2. 2 Dry Mode ZONE A Compressor : if Tr - Ts > 2 o C ON OFF Low Fan ON OFF 12 Minutes WM-J

2. Operating Modes 2. 2 Dry Mode ZONE B Compressor : if 0°C < Tr - Ts < 1°C ON OFF 8 min Low Fan 4 min ON OFF 30 sec WM-J 30 sec 12 Minutes

2. Operating Modes 2. 2 Dry Mode ZONE C Compressor : if 1°C < Ts - Tr < 2°C ON OFF 6 min Low Fan 6 min ON OFF 30 sec WM-J 30 sec 12 Minutes

2. Operating Modes 2. 2 Dry Mode ZONE D Low Fan : if Ts - Tr > 3°C ON OFF 30 sec Compressor ON OFF 12 Minutes WM-J

2. Operating Modes 2. 3 Fan Mode • • • Only HI, MED and LO speeds are allowed The compressor and the outdoor fan will stop The 4 -way valve will turn off also WM-J

2. Operating Modes 2. 4 Heat Mode 2. 4. 1 Heat Pump Model • Compressor will cut in if Tr < Ts + 1. 0˚C • Compressor will cut out if Tr –Ts > 3. 5˚C Note: Tr = Room Temperature Ts = Set Temperature WM-J

2. Operating Modes 2. 4 Heat Mode 2. 4. 2 Hot Start • The indoor fan speed modulate according to the Tin coil: - If Tin coil > 40˚C, indoor fan run at user set speed - If Tin coil < 18˚C, indoor fan stop - If Tin coil crosses 30˚C, indoor fan change to silent fan speed Note : Tin coil = Indoor Coil Temperature WM-J

2. Operating Modes 2. 4 Heat Mode 2. 4. 3 Hot Keep When compressor cuts out, the indoor fan will runs according to hot keep options There are only 1 option of Hot Keep: Fan Off Option WM-J

2. Operating Modes 2. 4 Heat Mode 2. 4. 3 Hot Keep Fan Off Option • If Tin coil > 40˚C, indoor fan run at set speed • If Tin coil crosses 37˚C, indoor fan run at silent speed • If Tin coil < 30˚C, indoor fan stop WM-J

2. Operating Modes 2. 4 Heat Mode 2. 4. 4 4 -Way valve Changing • To run heat mode, 4 -way valve MUST turn ON • 4 -way valve can only be changed from ON to OFF or vice-versa 150 seconds after the compressor has cut out • Then the compressor cut in after 4 sec WM-J

2. Operating Modes 2. 5 Defrost Mode • • Defrost mode can only be declared under heat mode Defrost timer start counting when OD coil temperature < +3°C Upon crossing over +5°C or higher more than 150 sec, timer will reset Temperature sensing can be done only when compressor run time > 2 min WM-J

2. Operating Modes 2. 5 Defrost Mode To °C +3 +2 0 C P 13 P 17 P 15 0 time P 16 B P 14 A P 12 WM-J Defrost mode if more than 3 minutes

2. Operating Modes 2. 5 Defrost Mode Defrost mode will start if compressor run time is : i) 30 mins to 60 mins below +3°C, if OD coil temperature is <=-8°C for > 3 min (compressor ON) ii) 60 mins to 120 mins below +3°C, if OD coil temperature is <=-4°C for > 3 min (compressor ON) iii) >120 mins below +3°C, if OD coil temperature is <=-2°C for > 3 min (compressor ON) If unit in OD fan forced off mode, defrost mode is not allowed to declare WM-J

2. Operating Modes Defrost Cycle C 2. 4 version • • • RMODE 7. 5 k ohm resistor Indoor fan, auxiliary heater, outdoor fan, 4 WV cut off while compressor remain on Defrost mode terminate when 1) OD coil temperature > 10°C or 2) minimum 10 minutes compressor run time Compressor cut out at the end of defrost cycle, 4 WV on after 50 seconds Compressor can cut in after 10 seconds WM-J

2. Operating Modes 2. 6 Auto Mode Under Auto mode, COOL & HEAT mode can be changed automatically depending on room & set temperature (a) If the present Auto mode is COOL, ( Mode Set Temperature = User Set Temperature) COOL HEAT IF I) II) Tr <= Ts mode- 3. 5°C AND The compressor has cut out for at least 10 mins WM-J

2. Operating Modes 2. 6 Auto Mode (b) If the present Auto mode is HEAT, ( Mode Set Temperature < User Set Temperature-1. 5°C) HEAT COOL IF (i) Tr > Ts mode + 3°C AND (ii) The compressor has cut out for at least 10 mins WM-J

2. Operating Modes 2. 7 Off Mode • No LED indication when unit is turned off • All relays is turned off immediately after ON/OFF triggering except 4 -way valve (subject to 4 WV switching time protection) WM-J

3. Protections 3. 1 Compressor 3. 2 Outdoor Fan Speed Control 3. 3 Indoor Anti Freeze 3. 4 Gas Leak (Outdoor unit abnormal) 3. 5 Fan Lock WM-J

3. Protections 3. 1 Compressor (a) 3 minutes Minimum OFF time • Compressor can only cut in after a minimum period of 3 mins from the time it cuts off except during valve changeover sequences • There shall have a minimum delay timer of 2 sec between outdoor fan & compressor when both turn on WM-J

3. Protections 3. 1 Compressor (b) Compressor Random Restart • With memory backup selection, compressor cut in 0 -64 sec after power up again • Compressor cut in is subjected to thermostat cut in mode WM-J

3. Protections 3. 1 Compressor (c) Compressor Minimum Run Time • Compressor can only cut out after minimum 3 mins of running in current mode • Compressor can cut out at any time is system is switched to other modes or other protection sequences (d) Compressor Overload Protection • Method to detect compressor overload is by coil sensor detection WM-J

3. Protections 3. 1 Compressor (e) Coil Sensors Detection Cooling Cycle Comp & OD Fan ON OD coil temp 68 o C OFF Heating Cycle Comp, OD Fan & 4 WV ON ID coil temp 68 WM-J o. C OFF

3. Protections 3. 2 Outdoor Fan Speed Control (a) Heating Mode • Outdoor fan will cut off, if indoor coil temperature > 55˚C • Outdoor fan will resume, if indoor coil temperature < 50˚C (b) Cooling Mode • Outdoor fan will run when compressor has cut in WM-J

3. Protections 3. 3 Indoor Coil Anti Freeze Available in COOL mode only • IF ID Coil Temp reaches 1°C and below for at least 1 min AND compressor has run for at least 10 minutes ON Comp & OD Fan 1 o C OFF • IF ID Coil Temp reached 10˚C and above for at least 1 min Comp & OD Fan ON 10 o. C WM-J OFF

3. Protections 3. 4 Gas Leak (Outdoor unit abnormal) This option is selected via resistor RGL • Gas leak is declared if ID coil temp. is >25°C in cooling cycle OR < 20°C in heating cycle • System will check the gas leak mode if compressor run time of 30 mins achieved • If these condition is met, the system will reconfirm ID coil temperature for 5 mins in cool mode OR 5 mins in heat mode before declaring gas leak mode • No gas leak checking during outdoor defrost. Compressor run timer is reset WM-J

3. Protections 3. 5 Fan Lock • When there is no feedback from ID fan, unit will wait for 10 sec • After 10 sec, counter in the software will increase by one • Then LED will start blinking to indicate error of the unit while the compressor and OD fan are allowed to on depend on thermostat cycle • If there is no fan speed feedback error continue for another 30 sec, compressor and OD fan will be forced off • LED will continue blinking and louver is allowed to operate WM-J

Thank You WM-J