Carrier 42HQE - 38YE Service Manual page 14

Calculate from the end of latest defrost, evaporator high temp. protection only closes outdoor
fan with the compressor still running. Add up to 90 minutes.
9.5.2 Conditions of defrost ending:
Defrosting ends when either of the following :
The time gets to 10 minutes;
T3>20°c
9.5.3 Time sequence of the whole defrosting procedure is as follows:
Compressor
4-way Valve
Outdoor Fan
Indoor Fan
Remark: when the evaporator pipe sensor temp. more than TE16, The indoor fan start to run.
9.6 Auto mode
9.6.1 When running in automatic mode, the air conditioner automatically selects one of the following
operation modes: cooling, heating or ventilation according to the difference between room
temp. (TA) and set temp. (TS).
TA—TS
TA—TS>2
-1 ≤TA—TS≤+2
TA—TS<-1
9.6.2 At auto mode, the indoor fan blows automatically in selected mode.
9.6.3 One mode should be carried out for at least 15 minutes once selected. If the compressor
cannot start for 15 minutes, reselect the operation mode according to the room temp. and set
temp., or reselect when the setting temp. changed
9.7 Economic mode
Cooling: The set temperature rise 1
maintain as a constant and the air circulation is kept at low speed.
Heating: The set temperature decrease 1
maintain as a constant and the air circulation is kept at low speed (Cold air proof function takes
priority over all).
9.8 Manual operation
Manual operation is controlled by touching buttons and divided into force cooling
and forced auto mode. It transfers between these two modes by pressing the
buttons, the cycling order of the button press is:
Remote mode
9.8.1 Forced Cooling
9.8.1.1 In forced cooling mode, the remote signal is not accepted.
9.8.1.2 The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan
mode is set as low, the A/C operates in the forced auto mode under the requirements of the
forced auto mode.
9.8.1.3 During the start-up and operation, all of the following protecting functions work:
3minutes start-up delay protection, overload protection, outdoor protection, evaporator
Defrost 10or 6minutes
55S
50S
15S
Operation mode
Cooling
Air-only
Heating (air-only for cooling only type)
per hour. Two hours later, the set temperature will
per hour. Two hours later, the set temperature will
Forced auto
13
55S
50S
Forced cooling