Reverse Cycle Starting Control; Outdoor Fan Control; Way Valve Switching Control; Save Valve Control - Sanyo SPW-CR363GVH8 Service Manual

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.
Control sections
P/C compressor
AC compressor
4-way valve
Outdoor fan
Low-pressure valve 1, 2, 3
High-pressure valve
Save valve
Outdoor electronic contol valve

4. Outdoor Fan Control

(1) Outdoor fan mode
Mode Fan
3 H
2 M
1 L
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
Outdoor temperature
16 H (M)
0 H (M, L)
L (STOP)
* The outdoor fans rotate at the mode in the parentheses (
(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.)
Operation of each control section when heating operation starts
Reverse-cycle operation time
50 seconds
Compressor capacity control
↑
OFF
STOP
Compressor capacity control
↑

Save valve control

480 pulses
Heating
Outdoor temperature
21 H (M · L · STOP)
16 H (M · L)
H (M)
) according to the operating capacity.
II - 7
Processes and Functions
Stop time
20 seconds
OFF
OFF
ON
H
ON
OFF
ON
0 pulses
SM830063
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