Carrier 38MVQ, 40MVC, 38MVC, 40MVQ Sequence of Operation, Indoor Coil Freeze Protection

Page 21

Indoor Coil Freeze Protection

The indoor coil can freeze due to any of the following:

SLow system charge

SReduced indoor airflow

SRestricted refrigerant flow

SLow ambient temperature (outdoor) S Low load (indoor)

In cooling mode, the thermistor located on a return bend of the indoor coil monitors the coil temperature continuously. Any time the coil temperature drops below the TE5 limit for five consecutive minutes, the compressor and outdoor fan will be switched off until the coil temperature rises above the TE6 as shown below:

 

 

 

 

 

 

 

 

 

 

Compressor and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outdorr fan on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EVAP te

m

p. down

 

 

 

 

 

 

EVAP te

mp. up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor and outdoor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

fan off (after 5 mins)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TE5

TE6

 

 

 

T

 

 

 

 

 

 

 

 

 

 

(Evap Temp.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A08118

 

 

 

 

 

Fig. 20 – Indoor Coil Freeze Protection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

 

 

 

Coil Temperature ˚F (˚C)

 

 

 

 

 

 

40MVC(Q)

40MVC(Q)

 

40MVC(Q)

 

40MVC(Q)

 

 

 

 

 

 

009---1

012---1

 

 

 

018---3

 

024---3

TE5

 

39 (4)

41 (5)

 

 

 

36 (2)

 

36 (2)

TE6

 

50 (10)

54 (12)

 

 

 

54 (12)

 

54 (12)

Condenser High Temperature Protection

Condenser high temperature can occur due to any of the following conditions:

SHigh outdoor ambient S Outdoor fan blocked S Outdoor coil blocked

The outdoor coil thermistor on a heat pump unit continuously monitors the temperature of the outdoor coil. Anytime the coil temperature exceeds the TE10 limit, the compressor is switched off and the outdoor fan continues running to reduce the coil temperature. When the coil temperature drops below the TE11 limit, the compressor is switched back on as shown below:

Compressor off

Outdoor fan on

COND tem

p. down

 

 

 

 

 

 

 

 

 

 

 

 

 

COND

te

mp. up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor on

 

 

 

 

 

 

Outdoor fan on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TE11

TE10

T

 

 

 

 

A08119

Fig. 21 – Condenser High Temp Protection

 

 

 

 

 

 

Condenser Temp.

Parameter

 

˚F (˚C)

 

 

38MVQ018---3

 

38MVQ024---3

TE10

149 (63)

 

158 (70)

TE11

131 (55)

 

149 (65)

Indoor High Temperature Protection

High indoor coil temperature (in heating mode) can occur due to any of the following:

SHigh outdoor ambient temperature S Indoor fan blocked

S Indoor coil blocked (including dirty filters)

The indoor coil thermistor on a heat pump unit continuously monitors the temperature of the indoor coil during heating operation. Anytime the coil temperate exceeds the TE8 limit, the outdoor fan is switched off. If the coil temperature continues to climb and exceeds the TE7 limit, the compressor is switched off. When the coil temperature drops below the TE9 limit, the compressor and outdoor fan are switched back on as shown below:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor off

 

 

 

 

 

 

 

 

 

 

 

Compressor on

 

 

 

 

Fan off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MVQ

T tem

p.

down

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T te

mp

. up

 

38/40MVC,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TE9 TE8

 

TE7

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A08120

 

 

 

 

 

Fig. 22 – Indoor High Temperature Protection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Condenser Coil Temp.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

 

 

 

 

 

˚F (˚C)

 

 

 

 

 

 

 

 

 

40MVQ

 

 

40MVQ

 

 

40MVQ

 

 

40MVQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

009---1

 

012---1

 

018---3

 

024---3

 

 

TE7

 

 

 

140 (60)

 

140 (60)

 

145 (63)

 

145 (63)

 

 

TE8

 

 

 

129 (54)

 

129 (54)

 

129 (54)

 

129 (54)

 

 

TE9

 

 

 

118 (48)

 

118 (48)

 

122 (50)

 

122 (50)

 

 

SEQUENCE OF OPERATION

Interface

A wireless remote control, supplied with the unit, is the interface between the fan coil and the user. The wireless remote control has the following characteristics:

SCapable of displaying _C and _F with _C being the default setting. To change the default setting, refer to the Owner’s Manual or push the recessed F/C button once using a paper clip or similar object*.

SThe remote control setpoint range is from 62_F (17_C) to 88_F (30_C) in increments of 2_F (1_C).

SThere is a dedicated cooling only and heat pump remote control.

SThe wireless remote control has an operating range of 25 ft. (7.62 m).

SThe same remote control can be used to control more than one unit.

SIf the remote control is lost, damaged, or the batteries are exhausted, the system can be operated by using the manual button (forced Auto) located under the front panel.

Manual button

A07364

Fig. 23 – Manual Button Location on Unit

*On units produced during week 12 (2008) and later. Units produced before week 12 have dedicated _C or _F controls.

21

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Contents Introduction 38MVC/40MVC 38MVQ/40MVQIndoor Unit Model Number NomenclatureStandard Features and Accessories Specifications Cooling only Units System Model NumberCoil Outdoor Specifications Heat Pump UnitsService Valve Locations Clearances Indoor 53MVC/MVQ System Operating Envelope Chart System Operating EnvelopeElectrical Data Connection Diagrams Connection DiagramsWiring Diagram 38MVC009----1 W/ 40MVC009----1 Wiring DiagramsWiring Diagram 38MVC012----1 W/ 40MVC012----1 Wiring Diagram 38MVC012----3 W/ 40MVC012----3 Wiring Diagram 38MVC018----3 W/ 40MVC018----3 Wiring Diagram 38MVQ009----1 W/ 40MVQ009----1 Wiring Diagram 38MVQ012----1 W/ 40MVQ012----1 Wiring Diagram 38MVQ012----3 W/ 40MVQ012----3 Cooling Refrigeration Cycle DiagramRefrigerant Lines General refrigerant line sizingRefrigerant Charge System Evacuation and Charging Using Vacuum PumpControl System Minute Time DelaySystem Safeties Compressor Overcurrent ProtectionIndoor High Temperature Protection Condenser High Temperature ProtectionSequence of Operation Indoor Coil Freeze ProtectionModes of Operation Defrost Auto FanDry Dehumidification Mode Manual OperationForced Cooling Operation Diagnostic Hierarchy TroubleshootingRequired Tools Recommended StepsYes Chart 1 Indoor FAN Speed OUT of ControlChart 2 Temperature Sensor Chart 3 Compressor Overcurrent Protection Chart 4 Indoor Unit Communication Error Size 9K and 12K Chart 5 Outdoor Unit Protects Chart 6 Indoor Unit Communication Error Size 18K and 24K Chart 7 Unit not RUNNING, no Diagnostic Code Chart 8 Unit not Running Optimally Chart 9 Unit not Running Optimally HP in Heating Chart 10 Compressor Chart 11 Outdoor Motor Chart 13 Receiver Board Chart 12 Reversing ValveAppendix Appendix Table of Contents Description NumberInput or Output Value 38MVC009--- --- ---1/38MVC012--- --- ---1 Control Board40MVC009--- --- ---1/40MVC012--- --- ---1 Control Board 38MVQ009---1/38MVQ012--- --- ---1 Control Board40MVC012--- --- ---3 Control Board 38MVC012--- --- ---3 Control Board38MVQ012--- --- ---3 Control Board 40MVQ012--- --- ---3 Control BoardControl Board 38MVC018--- --- ---3 Control BoardTemp. ˚F/˚C Resistance KΩ A6 Characteristics of Temperature Sensor18K & 24K Units 9K & 12K UnitsCatalog No.38---40MV---1SM
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40MVQ, 40MVC, 38MVQ, 38MVC specifications

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