Carrier 42HQE - 38YE Service Manual page 13

9.3 Dehumidifying mode
9.3.1 Indoor fan speed at low speed.
9.3.2 Protection is same as cooling mode.
9.4 Heating mode
9.4.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode.
9.4.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode,
except for the defrosting mode or the end of defrost.
9.4.3 Action conditions of compressor at heating mode: compressor must run for 4 minutes after
starting and then judge temperature. Meanwhile other protections are still valid.
Room temp. up
Room temp. down
9.4.4 Indoor Fan actions at heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller,
Anti-cold wind function 1.
Indoor exchanger temp. up
Indoor exchanger temp. down
Anti- cold air protection 2 ( when the room temp. satisfy the setting temp.)
Room temp. up
Room temp. down
Auto wind
Room temp. up
Room temp. down
Indoor evaporator high-temperature protection
Indoor exchanger temp. up
Indoor exchanger temp. down
9.5 Defrosting mode
9.5.1 Conditions of defrost:
Defrosting starts when either of the following :
T3 lower than 0°c, lasts for more than 40 minutes, provided that the time period when the
temperature is lower than -3°c consecutively reaches 3 minutes.
Condition Compressor
T> Ts+4
T<Ts+4
T< Ts+3
T>Ts+3
Condition
T= Indoor exchanger temp.
T<TE1
TE1<T<TE2
T>TE2
T>TE3
TE4<T<TE3
T>TE4
T=evaporator pipe sensor temp.
T<TE14+2
T> TE14+2
T> TE14
T< TE14
Condition
T=Indoor Temp.-Setting Temp.
T<2
T>2
T> 0
T<0
Condition
T= Indoor exchanger temp.
T<TE8
TE8<T<TE7
T>TE7
T>TE9
T<TE9
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Outdoor fan
Off Off
On On
On On
Off Off
Indoor fan speed
Off
Low speed
Setting fan speed
Setting fan speed
Low speed
Off
Indoor fan speed
Low speed or stop
Setting speed.
Setting speed.
Stop after 15 seconds Low speed
Indoor fan speed
Compressor
On
On
Off
Off
On
Med. speed
Low speed.
Low speed.
Med. speed
Outdoor fan
On
Off
Off
Off
On