9-2. Protective Functions

Overload prevention during heating

During HEAT operation, the temperature of the indoor heat exchanger is used to control the frequency and lessen the load on the compressor before the protective device is activated.

Indoor heatexchanger

temperature ( C)

Approx.

 

A

 

Indoor heat exchanger

 

 

A. Control start

53

 

 

 

 

 

 

B. Control end

 

 

 

 

Approx.

 

 

 

B

47

 

 

 

 

 

a

b

c

d

a.Area: Automatic capacity control

b.When Point A has been exceeded, the operation frequency is reduced by a certain proportion.

c.Area: Frequency increase is prohibited.

d.At Point B and below, overload prevention is ended and control is the same as in the a area.

Freeze prevention

During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.

1.Freeze-prevention operation is engaged when the temperature of the indoor heat exchanger is below 6 C.

2.Restart after freeze-prevention operation occurs when the temperature of the indoor heat exchanger reaches 8 C or above.

Indoor heat exchanger

 

8

 

 

C

temperature ( C)

 

 

 

6

A

B

 

 

 

 

2

 

 

 

*

 

 

 

 

 

a

b

c

d

a.Area: Automatic capacity control

b.When the temperature drops below Point A, the operation frequency is reduced by a certain proportion.

c.Area: Frequency increase is prohibited.

d.When the temperature reaches Point C or above, freezing prevention is ended and control is the same as in the a area.

*When the temperature drops to below 2 C (continuously for 2 minutes or longer), the compressor stops.

Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off.

NOTE

The Freeze Prevention Control during the Low Ambient Cooling Mode (outside air temperature:15 C or lower) is as follows.

The compressor stops when the temperature of indoor heat exchanger becomes less than 2 C.

The compressor restarts when the temperature of indoor heat exchanger becomes 8 C or higher.

Cold-air prevention during heating

During heating, the fan speed is set to "LL" (very low) or stopped. As the temperature of the indoor heat exchanger rises, the fan speed is changed to the set speed.

High

 

 

Set fan speed

 

 

 

 

Normal operation

 

 

 

 

At start of operation

LL

 

 

 

Stopped

25

30

Approx. 40

 

Indoor heat exchanger

temperature (C)

NOTE

The fan speed is forcibly changed to "LL" beginning 30 seconds after the thermostat turns OFF.

Normal operation refers to operation when the room temperature has approached the set temperature.

When HEAT operation starts, the indoor fan is stopped until the temperature of the indoor heat exchanger reaches 20 C or higher, or until the room temperature reaches 15 C or higher.

Compressor discharge temperature control

This function controls the operation frequency to prevent the compressor discharge temperature from rising more than a specified temperature.

Compressor discharge temperature (C)

Approx.

A

 

 

101

 

 

 

Approx.

 

 

B

94

 

 

 

a

b

c

d

a.Area: Automatic capacity control.

b.When the temperature rises above Point A, the operation frequency is reduced at a specified rate.

c.Area: Further frequency increase is prohibited.

d.When the temperature falls below Point B, prevention of a rise in frequency is released and the air conditioner operates as in a area.

*The compressor will stop if the temperature of the compressor discharge exceeds 120 C due to shortage of gas or other reason.

41

Page 41
Image 41
Sanyo SAP-KRV94EHDX service manual Protective Functions, Overload prevention during heating, Freeze prevention

SAP-KRV94EHDX specifications

The Sanyo SAP-KRV94EHDX is a cutting-edge split-type air conditioning unit that exemplifies advanced technology and efficiency. Designed for both residential and commercial spaces, this model is equipped with features that cater to various cooling and heating needs.

One of the main highlights of the Sanyo SAP-KRV94EHDX is its energy efficiency. With a high Energy Efficiency Ratio (EER), this unit minimizes energy consumption while maximizing cooling performance. This not only results in lower electricity bills but also contributes to a reduced carbon footprint, making it an environmentally friendly choice for users.

The SAP-KRV94EHDX employs inverter technology, which allows the compressor to adjust its speed dynamically based on the temperature requirements of the environment. This means that the unit operates more quietly and uses less energy when maintaining a consistent temperature. The inverter system ensures that the air conditioner can quickly reach the desired cooling or heating temperature and maintain it without the frequent on-off cycles typical of traditional units.

Additionally, the air conditioning unit comes with a powerful cooling capacity, effectively managing larger spaces. It can easily handle varying ambient conditions while providing rapid cooling in extremely warm weather, making it perfect for areas with hot climates.

Other notable features include a user-friendly remote control, allowing users to adjust settings from a distance effortlessly. The unit also incorporates a multi-stage air filtration system designed to remove dust, allergens, and other airborne particles, contributing to better indoor air quality.

The Sanyo SAP-KRV94EHDX is not just about functionality; it also boasts a sleek and modern design that blends seamlessly with various interior aesthetics. Its quiet operation ensures that it does not disturb daily activities, making it suitable for bedrooms, offices, and living spaces.

Moreover, the unit comes with various operational modes, including cooling, dehumidification, and a heating function. This versatility makes the SAP-KRV94EHDX an all-season solution for climate control.

In summary, the Sanyo SAP-KRV94EHDX is a top-tier air conditioning unit that combines efficiency, advanced technology, and user convenience. Its inverter technology, multi-stage air filtration, and modern design make it a reliable choice for anyone seeking comfort throughout the year.