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SERVICE MANUAL
2-WAY ECO-i
MULTI SYSTEM
CHDX07263
CHDXR07263*
CHDX09663
CHDXR09663*
Outdoor Units
Class 72 96
CHDX07263 CHDX09663
C ECO-i W-2WAY
**
CHDXR07263 CHDXR09663
Refrigerant R410A is used in the outdoor units.
* Salt-Air Damage Resistant Specifications.
Indoor Units
Class 7 9 12 15 18 19 24 36 48 54
4-Way Air Discharge
X XHX1252 XHX1852 XHX2452 XHX3652
Semi-Concealed
4-Way Air Discharge
XM XMHX1252 XMHX1852
Mini Semi-Concealed
1-Way Air Discharge
A AHX0752 AHX0952 AHX1252
Semi-Conceal
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IMPORTANT! Please Read Before Starting This air conditioning system meets strict safety and operat- When Installing… ing standards. As the installer or service person, it is an …In a Room important part of your job to install or service the system so it operates safely and efficiently. Properly insulate any tubing run inside a room to prevent “sweating” that can cause dripping and water damage to For safe installation and trouble-free operation, you must: walls and floors. Carefully read this
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Check of Density Limit The room in which the air conditioner is to be installed requires a design that in the event of refrig- erant gas leaking out, its density will not exceed a set limit. The refrigerant (R410A), which is used in the aircondition- er, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer. However, since it contains more than air, it poses the risk of suffocation if its density should rise excessively. Suf-
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— CONTENTS — Section 1: CONTROL FUNCTIONS .......................................... 1-1 1. Introduction ............................................................. 1-2 2. Selecting Outdoor Unit for Operation ......................................... 1-3 3. Compressor Control ...................................................... 1-4 4. Special Controls ......................................................... 1-9 5. Other Controls ........................................................
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Section 5: TROUBLE DIAGNOSIS .......................................... 5-1 1. Contents of Remote Controller Switch Alarm Display ............................. 5-2 2. Outdoor Unit Control Panel LED Display ...................................... 5-4 3. Remote Controller Servicing Functions ....................................... 5-5 4. W-2WAY ECO-i Alarm Codes ............................................... 5-7 5. Blinking Inspection Display on the Remote Controller .........................
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W-2WAY ECO-i SYSTEM Control Functions Contents 1. CONTROL FUNCTIONS 1. Introduction ........................................................... 1-2 2. Selecting Outdoor Unit for Operation ...................................... 1-3 3. Compressor Control .................................................... 1-4 4. Special Controls ....................................................... 1-9 1 5. Other Controls ....................................................... 1-14 6. Operation of Solenoid Va
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W-2WAY ECO-i SYSTEM Control Functions 1. Introduction The W-2WAY ECO-i is a system that allows multiple outdoor units to be connected. The outdoor units all contain inverter compressors, and the system does not utilize the sub units that were used in earlier systems. The outdoor unit where the unit No. is set to “1” includes the CCU (command controller unit) functions that are used to control the entire system. As a result, the system will not operate if no outdoor unit has been set as unit No.
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W-2WAY ECO-i SYSTEM Control Functions 2. Selecting an Outdoor Unit for Operation 2-1. Outdoor Unit Operating Rules Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of priority for compressor operation. Therefore there is no order of priority for the outdoor units. However, it is possible to operate the outdoor units in sequence, beginning with unit No. 1, by using the outdoor unit maintenance remote controller to change the outdoor
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W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-1. Compressors Mounted in the Outdoor Units [CHDX07263, CHDX09663] Capacity 72 96 DC Inverter DC Inverter Compressor 1 Rotary Installed compressor Compressor 2 Scroll 5 hp ––– hp = horsepower 1 Constant INV speed INV Compressor 2 Compressor 1 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
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W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-3. Compressor Capacity Control The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of indoor heat load, outdoor temperature and other factors. Unit No. 1 (CCU) calculates the required capacity accord- ing to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the compressor start/stop rules. Fine adjustments to system capacity
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W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode 60.8 °F Horsepower increase 53.6 permitted Area A 51.9 51.8 51.8 Horsepower increase 1 Area AB 45.5 permitted 41.1 41.0 41.0 Horsepower increase Area B prohibited 35.6 35.6 35.4 Horsepower decrease Area C 30 0 15 Maximum requirement level [L] * Depending on the maximum requirement level of the indoor unit, the judgement temperatures f
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W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-6-2. Condensation Temperature (Tc) Control: Control of Indoor Units Operating either in Cooling Mode or Heating Mode PX=125.6°F Thermostat OFF Area D PX –0.1 Horsepower decrease Area C 118.5 118.4 118.4 1 Horsepower increase Area B prohibited 116.6 116.6 116.4 Horsepower increase Area AB 109.4 permitted 113.0 112.8 100.4 107.6 Horsepower increase Area A permitted 98.6 * Depending on the maximum requirement level 15 30 0 of the
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W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control (2) Current Protection Inverter compressor current control is composed of primary current control and secondary current control. Current protection control for the inverter compressor is performed by self-protection in the inverter circuit, and does not increase or decrease the compressor capacity. Secondary current Control Primary current - 75.0A or (302°F) Inverter compressors stop (HIC auto. protection) 1 Inverter compressors stop (
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W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special con- trols for control of the system as a whole. 1. 4-way Valve Adjustment Control 2. System refrigerant oil recovery control 3. Defrost control 4-1. 4-way Valve Adjustment Control 1 When the microcomputer is initialized immediately after power-ON, after warning output, and all outdoor units are kept stopped for a preset pe
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W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-2-3. Refrigerant Oil Recovery Control between Systems (1) Simplified flow of system refrigerant oil recovery control Refrigerant oil recovery control between systems shall be performed as the flow mentioned below. Normal operation 3-minute stop Refrigerant oil recovery control between systems (Max. 3 minutes) 3- minute stop Normal operation (2) Cooling cycle Control time Maximum 3 minutes (Stops once before and once
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W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-3. Frost detection (A) Frost detection does not occur for 5 minutes after operation starts. (B) Frost is detected when either condition 1 or 2 below is met. Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is operating. Condition 2: L1 line or below is detected for a total of 60 minutes when the compressor is operating. Heat exchange liquid temperature °F
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W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-6. Outdoor unit cycle defrost Outdoor unit cycle defrost is performed in systems where 2 outdoor units are connected to the refrigerant system. (1) Description of outdoor unit cycle defrost With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a con- denser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode. In this way, the other outdoor unit is
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W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-7. Defrost end judgment conditions Defrost ends when either of the below defrost end judgment conditions is met. Condition 1: The temperatures are 50°F or higher at all temperatures sensors installed on the outdoor unit heat exchanger coils. However, if there is any other outdoor unit where the defrost end condition has not been met, defrost control continues for all outdoor units, and system defrost control is not ended. Condition
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W-2WAY ECO-i SYSTEM Control Functions 5. Other Controls 5-1. Oil Control 5-1-1. Oil level Oil level Meaning Conditions of oil Judgement The compressor contains oil more than There is no problem. the oil level which is necessary and 2 Sufficient sufficient for normal operation. 1 The compressor contains sufficient oil Confirm that oil is returned after but there is a possibility of shortage performing the oil control operation. 1 Slightly low against the required oil level. The compressor oil
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W-2WAY ECO-i SYSTEM Control Functions 6. Operation of Solenoid Valves 6-1. Refrigerant Control Valve [RCV] The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when the outdoor unit heat exchanger is functioning as a condenser. When the valve determines that there are signs of a low refrigerant level, refrigerant is supplied from the receiver tank to the system. (1) The OFF conditions take priority over the ON conditions for this valve
