Heat Controller VMC24SB-1/VMH24SB-1 service manual Low Ambient control, 12.1 9,12kBtu/h Model

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Part 2 Functions & Controls

5.12 Low Ambient control

5.12.1 9,12kBtu/h Model

If outdoor temperature drops below a certain temperature, liquid return is prevented by On/Off control of outdoor fan.

It can prevent frosting of evaporator and keep cooling operation

Model

Mode-in Condition

Mode-out Condition

 

 

 

Mode-in by outdoor

Outdoor fan-on time 3 min.

Outdoor fan-off time 5 min.

(And) Outdoor pipe temp. 4˚C (39˚F)

(Or) Outdoor pipe temp. 20˚C(68˚F)

pipe temp.

(And) Outdoor temp. < 10˚C (50˚F)

(And) Outdoor temp. 10˚C (50˚F)

 

 

 

 

Mode-in by indoor

Comp-on time 5 min.

Outdoor fan-off time 5 min.

(And) Indoor pipe temp. 4˚C (39˚F)

(Or) Indoor pipe temp.4˚C (39˚F)

pipe temp.

(And) Outdoor temp. < 10˚C (50˚F)

(And) Outdoor temp. 10˚C (50˚F)

 

 

 

 

5.12.2 18, 24, 30kBtu/h Model

Low ambient cooling case : In this situation outdoor fan works in ON/OFF control.

:If the pipe temperature 0°C(32°F) and it is falling rapidly, the compressor will run for 5 min & then it will go into low ambient control. (Temp. value can be different for each model.)

After the system is stopped by CT cut or heat sink cut-off then the cycle returns to the normal conditioned con-

trol.

 

 

 

 

 

 

Outdoor pipe temp

 

 

 

(T2 = 0)°C

 

 

 

 

 

(T1 = 0)°C

 

 

 

 

 

O/D fan

Set speed

Off

Set speed

Off

Set speed

Model

T1 [˚C(˚F)]

T2 [˚C(˚F)]

 

 

 

18kBtu/h

18(64)

18

 

 

 

24kBtu/h

16(61)

16

 

 

 

30kBtu/h

0(32)

0

 

 

 

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Only for training and service purposes

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Contents Heat CONTROLLER, INC Contents Part 1 General Information Safety Precautions Be sure not to do Be sure to follow the instructionPart 1 General Information Inspections after Repair Part 2 Functions & Controls List of Functions & Controls Category Function Description RemarkCooling Mode Basic Mode ControlsHeating Mode Heatpump Only Healthy Dehumidification operation Intake air Temp Setting TempAuto changeover operation Heatpump Only Special Mode Controls Energy saving operation in cooling modeJet Cool operation Jet Heat operation Heatpump OnlyAuto cleaning operation Utility FunctionsForced operation Heat/pump Model Cooling/only ModelAir volume control Sleep mode Auto controlSleep timer operation for cooling cycle Natural Air ControlAuto WindSleep timer operation for heating cycle Heatpump Only Auto restartProtection Functions & Controls Five Seconds Stand-by fanTwo Minutes Stand-by comp Hot start Heatpump OnlyOutdoor Temperature Running Time sec Compressor Preheating Heatpump OnlySump Heater Control 9, 12kBtu/h Model Only Heatpump Only 1 9,12kBtu/h ModelAutomatic defrost Heatpump Only Starting the defrosting operation 2 18,24,30kBtu/h ModelDefrosting Control Algorithm Control algorithm of defrost completionPower Relay Control InverterOverheating Protection Power Module Heat sink temperature control Heat sink sensor failure errorFunction Total Current Control Over Current Protection CT1 controlCT2 control Model KBtu/h Cooling Heating11A 12A 14A 15.5A DC Peak control Discharge Pipe Temp ControlInverter Compressor 18,24,30kBtu/h Model There can be two situations Constant Compressor only 30kBtu/h ModelCompressor working Low Ambient control 12.1 9,12kBtu/h Model12.2 18, 24, 30kBtu/h Model Model Mode-in Condition Mode-out ConditionOil return control30kBtu/h Model Heatpump Only Oil equalizing control30kBtu/h ModelOperating Contion Operation ProcessCheck before Test Run Test Run Flow chart Test Run Detail Part 3 Test RunCheck before Test Run Test Run Flow chart StartPump Down Procedure Test Run DetailSettlement of outdoor unit Evaluation of the performancePart 4 Trouble Shooting Way, 3-Way Valve Way Valve Liquid SideProcedure Pumping DownAir purging of the charge hose Set the 2-way valve to the closed positionEvacuation Mount the valve stem nuts and the service port nut Gas Charging After EvacuationConnect the charge hose to the charging cylinder Purge the air from the charge hoseCycle Troubleshooting Guide Trouble analysisElectronic Parts Troubleshooting Guide Procedure Specification RemedyTrouble Compressor/Outdoor Fan does not operate 9, 12kBtu/h Model Trouble When indoor Fan does not operate.9~30kBtu/h Model Self-diagnosis Function Error Indicator12kBtu/h Model 18,24,30kBtu/h Model Indoor Error Outdoor ErrorError code Descrition Red Green StatusError CodeTroubleshooting Guide9,12kBtu/h Model Description Cause of error Heat-sink Temp. is over Description Cause of error DC Peak Error Description Cause of error Over current Error Description Cause of error Indoor fan is locked Description Cause of error Discharge pipe temp. is Troubleshooting CH01, CH02, CH06 Check PointPart Trouble Shooting Troubleshooting CH05, CH53Comp Troubleshooting CH21Copper Comp pipe Troubleshooting CH21, CH22 Troubleshooting CH23, CH28 Troubleshooting CH24, CH25 Troubleshooting CH26, CH27 ‘B’Troubleshooting CH32, CH33, CH40 Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Inverter/Constant Troubleshooting CH51, CH60Condenser/Suction Pipe Troubleshooting CH61, CH62 Heat CONTROLLER, INC

VMC12SB-1/VMH12SB-1, VMC18SB-1/VMH18SB-1, VMC24SB-1/VMH24SB-1, VMC09SB-1/VMH09SB-1, VMC30SB-1/VMH30SB-1 specifications

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