Sanyo CHDXR09663, CHDXR07263 Compressor Control, Compressor Selection Rules, Capacity, Type

3. Compressor Control

W-2WAY ECO-i SYSTEM Control Functions

3-1. Compressors Mounted in the Outdoor Units [CHDX07263, CHDX09663]

		Capacity		72		96
	Installed	Compressor 1	Rotary	DC Inverter		DC Inverter
	compressor
		Compressor 2	Scroll	–––		5 hp
1
					hp = horsepower

INV

Constant speed INV

Compressor 1	Compressor 2 Compressor 1
Type 72	Type 96

3-2. Compressor Selection Rules

In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously. All the inverter compressors will stop at a time when the outdoor is stopped accordingly. Constant-speed compressors run in order of the shortest amount of operating time. In heating mode, the inverter compressor with the shortest amount of operating time runs at first followed by the compressors in order of the shortest amount of operating time including inverter units.

*Immediately after installation, all compressors have an operating time of zero. In this case, the compressors start in the following sequence: Inverter compressor > Constant-speed compressor 1 > Constant-speed com- pressor 2.

Examples of accumulated operating time: ODU=Outdoor Unit

Suppose the following tentative system.

	ODU 1	ODU 2
Comp 1	100 hrs.	70 hrs.
Comp 2	150 hrs.	160 hrs.

Compressor Selection Sequence in Cooling Mode:

All the inverter compressors are firstly selected simultaneously.

	ODU 1	ODU 2
Comp 1	1st	1st
Comp 2	3rd	4th

Compressor Selection Sequence in Heating Mode:

First, the inverter compressor with the shortest amount of operating time is selected. And then, the remained other compressors are selected and start in the order of shortest amount of operating time.

	ODU 1	ODU 2
Comp 1	3rd	1st
Comp 2	4th	2nd

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