Haier MRV5-H - Page 88

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(Note 1)The general standard for temperature di󰀨erence between inlet and outlet air
In "cooling" operation; it is normal that the dry bulb temperature di󰀨erence between inlet air and outlet air of the air
conditioner is over 50°F (at the maximum frequency) after 30 minutes of operation.
In "heating" operation; it is normal that the dry bulb temperature di󰀨erence between inlet air and outlet air of the air
conditioner is over 57°F (at the maximum frequency) after 30 minutes of operation.
(Note 2) General standard for operating current
It is normal that the current in either cooling/heating operation mode is within ±15% of the calibrated current. The
value of current may have the following di󰀨erences due to di󰀨erent operating conditions: When higher than the
standard current value: the temperature indoors and outdoors are high; heat dissipation of outdoor unit is poor.
When lower than the standard value of the current: the temperatures of indoor and outdoor are low; refrigerant gas
leaks (insu󰀩cient refrigerant).
(Note 3) General standard for operating pressure
Cooling
(at the maximum frequency)
High pressure 290~551 psi
Indoor 64-90°F Outdoor 77-
95°F
Low pressure 87~145 psi
Heating
(at the maximum frequency)
High pressure 319~435 psi
Indoor 59-77°F Outdoor 41-
50°F
Low pressure 43~116 psi
Values after 15-minute operation (the temperature therein refers to dry bulb temperature with unit of °F)
The transformation trend of high pressure and low pressure due to change of operation condition
Refrigeration/heating:
Indoor temperature rises – high/low pressure rises
Indoor temperature drops – high/low pressure drops
Outdoor temperature rises – high/low pressure rises
Outdoor temperature drops – high/low pressure drops
Evaluating unit through test device
Operation
Begin to operate the system after all conguration settings has
been conrmed.
Operating methods:
1. Switch the BM1, BM2 to OFF, search the indoor units and
outdoor unit to check if the number of indoor units are correct.
2. Switch the SW1, SW2, SW3 to 0, 13, 2 respectively, then press
SW2 for 2 seconds, the 7-segment display will display “1111”
and indoor unit will enter into cooling operation; or switch SW1,
SW2, SW3 to 0, 14, 2 respectively, then press SW2 for 2 seconds,
the 7-segment display will display “1111”, indoor unit will turn
on automatically and enter into heating operation. Frequency of
compressor is controlled by low pressure control for cooling, and
high pressure control for heating.