II - 7
Processes and Functions
SM830063
2
3. Reverse Cycle Starting Control
At the start of heating operation, the cooling cycle operates for 50 seconds. During this time, the outdoor and indoor
fans are stopped.
Reverse-Cycle start conditions:
(1) When starting heating operation after 60 minutes of stop operation
(2) When starting heating operation for the first time after turnning on the power
(3) Reverse-cycle start control details
After 50 seconds of reverse-cycle (cooling) operation, the outdoor unit stops for 20 seconds, then starts normal
operation.
Reverse-cycle operation time Stop time
50 seconds 20 seconds
P/C compressor Compressor capacity control OFF
AC compressor
↑
OFF
4-way valve OFF ON
Outdoor fan STOP H
Low-pressure valve 1, 2, 3 Compressor capacity control ON
High-pressure valve
↑
OFF
Save valve Save valve control ON
Outdoor electronic contol valve 480 pulses 0 pulses
4. Outdoor Fan Control
(1) Outdoor fan mode
Mode Fan
3H
2M
1L
0 STOP
(2) Initial control
For the first 30 seconds after operation starts, outdoor fans are controlled according to the outdoor temperature as
shown below.
When the fans are started, they rotate at high speed for 12 seconds.
Cooling Heating
Outdoor temperature Outdoor temperature
* The outdoor fans rotate at the mode in the parentheses ( ) according to the operating capacity.
(3) The fan mode is then switched up or down according to the operating conditions.
5. 4-way Valve Switching Control
(1) In normal operation, the 4-way valve is off for cooling and on for heating.
(2) When the outdoor unit is stopped while in heating mode, 60 minutes elapse and the 4-way valve goes OFF.
(Energy saving)
6. Save Valve Control
(1) The save valve is switched on according to the tables shown in Section 1. “Compressor Control.”
(2) The save valve is on when the outdoor unit is stopped. (This is due to pressure balance.)
Control sections
Operation of each control section when heating operation starts
16 H (M)
0 H (M, L)
L (STOP)
21 H (M · L · STOP)
16 H (M · L)
H (M)
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