Carrier DHMVHA Service Manual page 9

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DEFROST Mode
The unit enters the DEFROST mode according to the T3 temperature
value and the T3 temperature change value range plus the compressor
running time.
During the DEFROST mode, the compressor continues to runs, the
indoor and outdoor motors stop, and the indoor unit displays "df".
If any one of the following items is satisfied, the defrosting process
finishes and the unit reverts to the normal HEATING mode.
----T3 rises higher than TCDE1C.
----T3 remains higher than TCDE2C for 80 seconds.
----The unit runs for 15 minutes in DEFROSTING mode.
Evaporator Coil Temperature Protection
T2
TEstop
TEdown
TEH2
Fig. 12 — Evaporator Coil Temperature Protection
NOTE: The following applies to Fig. 12:
• Off: Compressor stops
• Decrease: Decrease the running frequency to the lower level
• Hold: Keep the current frequency
• Resume: No limitation for frequency
When the evaporator temperature is higher than the setting protection
value, the compressor stops.
Auto-Mode
This mode can be chosen with the remote control and the setting
temperature can be changed between 62
In AUTO mode, the unit chooses the COOLING, HEATING or FAN-
ONLY mode according to T (T =T1.Ts).
Table 5 — Auto Mode
ΔT=T1-Ts
°C
ΔT＞2
°C
-2≤ΔT≤2
°C
ΔT<-2
The indoor fan runs under AUTO fan in the relevant mode. The louver
operates the same as in the relevant mode. If the unit switches between the
HEATING and COOLING modes, the compressor stops for 15 minutes
and then chooses the mode according to T1−Ts. If the setting temperature
is modified, the unit chooses the running function again.
DRY Mode
Indoor Fan Speed is Set
The indoor fan speed is set in the BREEZE mode and cannot be
changed. The louver angle is the same as in the COOLING mode.
Low Indoor Room Temperature Protection
In the DRY mode, if the room temperature is lower than 50
compressor stops and will not resume until the room temperature
exceeds 53.6 ° F (12 ° C).
Evaporator Anti-Freezing Protection
The evaporator anti-freezing protection condenser high temperature
protection and outdoor unit frequency limit are active and both are the
same when the unit is in the COOLING mode.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Off
Decrease
Hold
Resume
° F (17 ° C)~86 ° F (30 ° C).
Running Mode
Cooling
Fan-Only
Heating
° °
F (10 C), the
Outdoor Fan
The outdoor fan operates the same when the unit is in the COOLING
mode.
FORCED OPERATION Function
When the unit is off, press TOUCH to engage the FORCED AUTO
mode. Press TOUCH again within 5 seconds to engage the FORCED
COOLING mode. In the FORCED AUTO, FORCED COOLING or
any other operation mode, press TOUCH to turn the unit off.
• FORCED OPERATION mode: In the FORCED OPERATION mode,
all the general protections and the remote control are available.
Operation Rules
• FORCED COOLING mode: The compressor runs at the F2
frequency and the indoor fan runs in the BREEZE mode. After
running for 30 minutes, the unit enters the AUTO mode at the 75.2
(24 ° C) setting temperature.
• FORCED AUTO mode: The FORCED AUTO mode is the same as
the normal AUTO mode with a 75.2
Timer Function
Timing range is 24 hours
Timer on. The unit turns on automatically when reaching the setting time.
Timer off. The unit turns off automatically when reaching the setting time.
Timer on/off. The unit turns on automatically when reaching the setting
"on" time, and then turns off automatically when reaching the setting
"off" time.
Timer off/on. The unit turns off automatically when reaching the setting
"off" time, and then turns on automatically when reaching the setting
"on" time.
The timer function will not change the unit's current operation mode.
Suppose the unit is off now; it will not start up first after setting the
"timer off" function. When the setting time is reached, the timer LED
turns off and the unit's running mode is the same. The setting time is
relative time. The unit exits the timer function if it experiences a
malfunction.
Sleep Function
The SLEEP function is available in the COOLING, HEATING or
AUTO mode.
The Operation process in the SLEEP mode is as follows:
• When cooling, the setpoint rises 2
(30 C) every one hour. Two (2) hours later, the room temperature
°
stops rising and the indoor fan remains at a low speed.
• When heating, setpoint decreases 2°F (1°C) (to a minimum of 62°F
(17°C) every one hour. Two (2) hours later, the setpoint stops
decreasing and the indoor fan is set at the low speed.
(Anti−cold wind function has the priority).
Operation time in the SLEEP mode is seven (7) hours. After seven (7)
hours, the unit exits the SLEEP mode and powers off.
AUTO−RESTART Function
The indoor unit is equipped with an AUTO−RESTART function, which
is carried out through an auto−restart module. In the event of a sudden
power failure, the module memorizes the setting conditions prior to the
power failure. The unit resumes the previous operation setting (not
including the SWING function) automatically three (3) minutes after the
power returns.
If the memorization condition is the FORCED COOLING mode, the
unit runs in the COOLING mode for 30 minutes and switches to the
AUTO mode at the 75 F (24
°
power turns off and the unit is required to start up, the compressor delays
the start up for 1 minute before powering on. In other instances, the
compressor waits three (3) minutes before restarting.
9
° F (24 ° C) setting temperature.
F (1 C) (to a maximum of 86
° °
C) setpoint. If the unit is off before the
°
°
F
F
°