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Toshiba SHRM R410A Quick Reference
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Toshiba SHRM R410A Quick Reference

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File No. A13-004
Q
uick reference
SHRM
SUPER HEAT RECOVERY MULTI
(UL Model)
R410A

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Summary of Contents for Toshiba SHRM R410A

  • Page 1 File No. A13-004 uick reference SHRM SUPER HEAT RECOVERY MULTI (UL Model) R410A...
  • Page 2 Refrigerant Piping Allowable length of refrigerant pipes and allowable height difference between units Outdoor Unit Header unit (A) Follower unit (B) Height difference between outdoor units H3 ≤ 0.3 ft (0.1 m) Outdoor unit connecting pipes Main piping Branching pipe Branching header Height difference...
  • Page 3 Cautions for installation • The header unit is connected to main piping to indoor units. • The header unit is the one with the highest capacity code. A (header unit) ≥ B • To connect gas pipes to indoor units, use Y-shaped branching joints to keep pipes level. •...
  • Page 4 Refrigerant Piping (Continued) Selection of pipe size Capacity code of indoor and outdoor units Selection of pipe material • For the indoor unit, the capacity code is decided at each capacity type. (Table 1) • The capacity codes of the outdoor units are decided at each capacity type. The maximum number of connectable indoor units and the total value of capacity codes of the indoor units are also decided.
  • Page 5 Selection of pipe size Title Use part Selection of pipe size <144 to 240 type> Model Balance pipe side Suction gas side Discharge gas side Liquid side Outdoor unit Outdoor unit 072 type Ø3/8" Ø7/8" Ø3/4" Ø1/2" ↓ connecting pipe 096 type Ø3/8"...
  • Page 6 Refrigerant Piping (Continued) FS unit (Flow Selector unit) Specifications Model Name RBM-Y0383FUL RBM-Y0613FUL RBM-Y0963FUL Power supply 230 V (208/230 V) 1phase 60 Hz Connectable indoor unit capacity (kBtu/h) Below 38 38 to below 61 61 to 96 or less Connectable indoor units Height (in) 7.49 7.49...
  • Page 7 Adding refrigerant After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of refrigerant. Calculation of additional refrigerant charge amount Refrigerant charge amount at shipment from the factory does not include the refrigerant for pipes at the local site. For refrigerant to be charged in pipes at the local site, calculate the amount and charge it additionally.
  • Page 8 Refrigerant Piping Systematic Drawing Model: MMY-MAP0724FT ∗ Fan motor Right side (TO) Main heat exchanger Right side sub heat exchanger PMV 1 PMV 2 Left side PMV 4 Main heat exchanger (TE 1) Left side sub heat exchanger (TE 2) (SV 11) 4-way valve...
  • Page 9 Model: MMY-MAP0964FT UL, MMY-MAP1204FT ∗ ∗ Fan motor Right side (TO) Main heat exchanger Right side sub heat exchanger Left side PMV 1 PMV 2 PMV 4 Main heat exchanger (TE 1) Left side sub heat exchanger (TE 2) 4-way (SV 11) valve (SV 5)
  • Page 10 Refrigerant Piping Systematic Drawing (Continued) Explanation of Functional Parts Functional part name Functional outline (Connector CN321: White) SV3A 1) Supplies oil reserved in the oil header during ON time. (Connector CN321: White) SV3B 1) Returns oil supplied in the balance pipe to the compressor. (Connector CN321: White) SV3C 1) Pressurizes oil reserved in the oil header during ON time.
  • Page 11 Configuration of outdoor unit heat exchanger Propeller fan Propeller fan Fan motor Fan motor Main heat Main heat exchanger exchanger Wind Wind Wind Wind direction direction direction direction Sub heat Sub heat exchanger exchanger ∗ ∗ MMY-MAP0724FT MMY-MAP0964FT ∗ Rear side Front side Front side Rear side...
  • Page 12 System Refrigerant Piping Schematic Diagram <Exchange of operation mode> For exchange between each operation mode, follow the table below: When “Momentary stop” is executed, the unit does not operate for 3 minutes after stop of operation before update. After exchange Single cooling Collective cooling Collective heating...
  • Page 13 Check Codes Check Check Description of error Description of error code code Indoor unit initially communicating normally fails to Wiring/installation error or detachment of outdoor return signal (reduction in number of indoor units discharge temperature sensor (TD1) has been detected. connected).
  • Page 14 Check Codes (Continued) (Errors detected by IPDU featuring in SMMS-i standard outdoor unit - typical examples) Check Check Description of error Description of error code code Temperature sensor built into indoor IGBT (TH) High-pressure SW is activated. has been open/short-circuited. Temperature sensor built into IGBT (TH) detects Inverter current (Idc) detection circuit detects overheating.
  • Page 15 Address Setup Check at Main Power-on After turning on the main power of the indoor units and outdoor unit in the refrigerant line to conduct a test opera- tion, check the following items in each outdoor and indoor unit. (After turning on the main power, be sure to check in order: indoor unit → outdoor unit.) <Check on the outdoor unit>...
  • Page 16 Address Setup (Continued) Address Setup This product requires address setup before operation. Follow this procedure for address setup. Precautions (1) Address setup is not performed simply by turning on the power supply. (2) For indoor units, address setup can be done either by “manual address setup” or “by automatic address setup” Automatic address setup: Setup from SW15 on the interface PC board of the header unit Manual address setup: Setup from the wired remote controller.
  • Page 17 Address Setup Procedure No central control: go to Address setting procedure 1 Central control of 2 or more refrigerant lines: go to Address setting procedure 2 When controlling a single refrigerant line When controlling 2 or more refrigerant lines (Example) centrally centrally Address setting...
  • Page 18 Address Setup (Continued) (Example) Controlling 2 or more refrigerant lines as a group Outdoor Outdoor System wiring Indoor Indoor Indoor Indoor diagram (Group control) Remote controller Address setting procedure 2 Set a system address for each system using SW 13 and 14 on the interface P.C. board on the header outdoor unit of each system.
  • Page 19 Be sure to disconnect the relay connectors between the [U1U2] and [U3U4] terminals on all the header outdoor units that will be connected to the central control. (Factory default: disconnected) CENTRAL INDOOR OUTDOOR CONTROL UNIT UNIT Turn on indoor units first, and then turn on outdoor units. About 1 minute after turning the power on, confirm that the 7-segment display on the interface P.C.
  • Page 20 Address Setup (Continued) After completing address setting of all systems, turn off dip switch 2 of SW30 on the interface P.C. boards of all the header outdoor units connected to the same central control, except the unit that has the lowest address. (For unifying the termination of the wiring for the central control of indoor and outdoor units) Connect the relay connectors between the [U1, U2] and [U3, U4] terminals of the header outdoor unit of each refrigerant line.
  • Page 21 Switch setting (setting example when controlling 2 or more refrigerant lines centrally) Outdoor units (setting manually) *The items in bold font must be set manually. Outdoor unit’s interface Header unit Follower unit Header unit Follower unit Header unit Factory default P.C.
  • Page 22 Address Setup (Continued) Manual address setup from the remote controller With indoor wiring work completed and outdoor wiring work not done—in cases where indoor unit addresses are decided in advance from the wired remote controller, or in cases where addresses are change after address setup. Arrange one indoor unit and one remote controller set to 1 by 1.
  • Page 23 NOTE (1) When setting the line address from the remote controller, do not use addresses 29 and 30. Addresses 29 and 30 cannot be set up on the outdoor unit. If they are incorrectly used, the code “E04” (indoor/outdoor communication circuit error) is output. (2) When manual address setup has been done from a remote controller, and central control over refrigerant lines is to be done, setup the header unit of each line as follows: •...
  • Page 24 Address Setup (Continued) To find an indoor unit’s position from its address When checking unit numbers controlled as a group CODE No. DATA SETTING UNIT No. R.C. TEMP. ON / OFF TIMER SET TIME FILTER Stop RESET TEST SET CL (Execute it while the units are stopped.) The indoor unit numbers in a group are indicated one after another.
  • Page 25 TEST Push and hold the TIME buttons at the same time for more than 4 seconds. AC AC AC AC AC At first, the line 1 and CODE No. (Address Change) are indicated on the LCD display. (Select an outdoor unit.) SWING/FIX UNIT LOUVER Push...
  • Page 26 Address Setup (Continued) To change all the indoor unit addresses using an arbitrary wired remote controller. (The method is available when the addresses have already been set automatically.) (When communication wirings of 2 or more refrigerant lines are interconnected for central control) NOTE You can change the addresses of indoor units in each refrigerant line using an arbitrary wired remote controller.
  • Page 27 Setting when connecting multiple indoor units to a FS (Flow Selector) unit Cautions to connection of indoor unit • When connecting the multiple indoor units to a single FS unit, it is necessary to set up the CODE No.. Be sure to set up the CODE No. after setup of address. •...
  • Page 28 Address Setup (Continued) How to set up the cooling only indoor unit When setting the specific indoor unit to Cooling Only Select an indoor unit of which setting is to be unit without connecting to the flow selector unit, setup to changed.
  • Page 29 Clearing Indoor Unit Address Resetting the address (Resetting to the factory default (address undecided)) Method 1 Clearing each address separately using a wired remote controller. 0099 Set the system address, indoor unit address and group address to “ ” using a wired remote controller. (For the setting procedure, refer to the address setting procedures using the wired remote controller on the previ- ous pages.) Method 2...
  • Page 30 In the case of an increase in address-undefined indoor units (extension, etc.) To set up the indoor address of a unit with an address that is undefined due to the extension of indoor units or replacement of PC board, etc., follow the methods below. Method 1 Set up an address individually from a wired remote controller.
  • Page 31 Check after Address Setup when Central Control System Is Connected When the central control system is connected, check that the following setup has finished after address setup. Central remote controller To other refrigerant line Line address = 2 Line address = 1 Other refrigerant line Header unit (A) Header unit (A)
  • Page 32 Test Operation Setup (Remote Conntroller) Cooling / heating test operation check The cooling/heating test operation check can be performed on both the indoor remote control and the outdoor header unit interface PC board. (1) Test operation start/stop operation Test operation from the indoor remote control •...
  • Page 33 Test Operation Setup (Remote Conntroller) (Continued) Wireless remote control (4-way Cassette type) Wireless remote control (Ceiling type) Procedure Operation content Procedure Operation content Turn off the air conditioner fs power. Turn on the air conditioner fs power. Remove the adjustment corner cap attached to This operation is not accepted for 5 minutes when the sensor section from the ceiling panel.
  • Page 34 Troubleshooting in Test Operation START Refer to "Test operation procedure" Test operation for one indoor unit of the indoor remote controller. The operation does not start for approximately 3 minutes after Operation starts powering-on or stopping operation. Note: After powering-on, it may require up to 10 minutes to start the operation due to the initial communications of the system.
  • Page 35 Note 1 : Criteria for the difference between suction and discharge temperatures (1) Individual cooling operation After operating for a minimum of 30 minutes in “COOL” mode, if the ΔT dry bulb temperature difference between suction and discharge air of the indoor unit is 46.4°F (8°C) or more, it is normal. (2) Individual heating operation After operating for a minimum of 30 minutes in “HEAT”...
  • Page 36 Troubleshooting in Test Operation (Continued) If there are phenomena such as the output of a check code or the remote controller is not accepted when poweredon after wiring work or during address setup operation, the following causes are considered. A Check Code Is Displayed on the Remote Controller Check the code Header displayed on the...
  • Page 37 Operation from the indoor remote controller is not accepted, and a check code is displayed on the 7-segment display of the interface PC board of the header unit. Indoor remote Header unit controller 7-segment Cause Countermeasures status display Line addresses and indoor addresses of all the connected Set up addresses.
  • Page 38 Troubleshooting in Test Operation (Continued) In checking the number of connected outdoor units and connected indoor units after address setup, a lower number of connected units is displayed. (There are outdoor/indoor units that do not operate in a test operation.) Status Cause Countermeasures...
  • Page 39 Error Clearing Function (1) Clearing from the main remote controller Error clearing in outdoor unit Error of the outdoor unit currently detected is cleared by the unit of one refrigerant circuit system to which the indoor units operated by the remote controller is connected. (Error of the indoor unit is not cleared.) For clearing errors, the service monitor function of the remote controller is used.
  • Page 40 Error Clearing Function (Continued) (2) Clearing error by using switches on the interface board of the header unit Using the switches on the interface P.C. board of the header unit, this function is to clear the currently detected error for each refrigerant circuit system without resetting the power supply. Errors in both outdoor and indoor units are once cleared, and error detection is performed again.
  • Page 41 Remote Controller Distinction Function This function is provided to distinguish the remote controller connected to the indoor unit from the outdoor unit for a refrigerant circuit system by using switches on the interface P.C. board of the header unit. <Distinction procedure> Be sure to turn on the power of the indoor unit Power ON prior to the power of the outdoor unit.
  • Page 42 Error Clearing Function (Continued) Pulse Motor Valve (PMV) Forced Open/Close Function in Indoor Unit This function is provided to open or close forcedly PMV for 2 minutes in all the indoor units by the switch operation on the interface P.C. board of the header unit. This function is also used to open PMV fully when turning off the power and executing an operation.
  • Page 43 Solenoid Valve Forced Open/Close Function in Outdoor Unit This function is provided to forcedly open each solenoid valve mounted in the outdoor unit by the switch operation on the interface P.C. board in the outdoor unit. Use this function to check there is no refrigerant clogging with ON/ OFF operation of the solenoid valve.
  • Page 44 Error Clearing Function (Continued) Fan Operation Check in Outdoor Unit This function is provided to check the fan operation of the outdoor unit by using switches on the interface P.C. board in the outdoor unit. The frequency of the fan speed can be controlled by setting of the switches. Use this function to check the operation or abnormal sound in the fan system.
  • Page 45 Abnormal Outdoor Unit Discrimination Method By Fan Operating Function This function is provided to forcedly operate the fan of the outdoor unit in which an error occurred or the fan of thevnormal outdoor unit by the switch operation on the interface P.C. board in the header unit. To specify which one of the follower units connected to the system was faulty, use this function for the system stop due to a follower unit fault (Check code [ [Operation]...
  • Page 46 Error Clearing Function (Continued) Manual Adjustment Function of Outside Temperature (TO) Sensor This function is provided to fix TO sensor value manually by the switch operation on the interface P.C. board in the outdoor unit. When the unit stops abnormally due to TO sensor failure, etc, an emergent operation is available by setting up the value manually to position near the current outside temperature.
  • Page 47 <Service support function list> SW01 SW02 SW03 7-segment display [A] Function contents [J . C] Refrigerant circuit and control communication line check function (Cooling operation) [J . H] Refrigerant circuit and control communication line check function (Heating operation) [P . ] Indoor PMV forced full open function [A .
  • Page 48 Method to Set Indoor Unit Function DN Code When Performing this Task, be sure to Use a Wired Remote Controller <Procedure> To be performed only when system at rest TEST Push the buttons simultaneously and hold for at least 4 seconds. The unit No.
  • Page 49 Function CODE No. (DN Code) Table Includes All Functions Needed to Perform Applied Control on Site Item Description At shipment Filter display delay timer 0000: None 0001: 150H According to type 0002: 2500H 0003: 5000H 0004: 10000H Dirty state of filter 0000: Standard 0000: Standard 0001: High degree of dirt (Half of standard time)
  • Page 50 Function CODE No. (DN Code) Table (Continued) Slim, High Static Duct type Item Description Atshipment Static pressure selection Slim Ducted 0001: Standard 0001: Standard 1 (factory defoult) 0003: High static pressure 2 0006: High static pressure 3 Timer setting 0000: Available (can be performed) 0000: Available (wired remote controller) 0001: Unavailable (cannot be performed)
  • Page 51 4-way, Compact 4-way, Ceiling, High wall type Item Description Atshipment High-ceiling adjustment 4-way Cassette 0000: Standard (Air flow selection) Type AP018 AP021, AP024, AP030 AP036, AP042 Value Air flow at outlet 4-Way 3-Way 2-Way 4-Way 3-Way 2-Way 4-Way 3-Way 2-Way Standard 9'2"...
  • Page 52 Confirmation of Test Operation Function to Start / Stop (ON / OFF) Indoor Unit from Outdoor Unit The following functions of the indoor unit can start or stop by the switches on the interface P.C. board of the header unit. No.
  • Page 53 (1) All cooling test operation function This function is provided to change collectively the mode of all the indoor units connected to the same system for the cooling test operation mode, by using switches on the interface P.C. board of the header unit. <Operation procedure>...
  • Page 54 Function to Start / Stop (ON / OFF)Continued (2) All heating test operation function This function is provided to change collectively the mode of all the indoor units connected to the same system for the heating test operation mode, by using switches on the interface P.C. board of the header unit. <Operation procedure>...
  • Page 55 (3) Single fan test operation function This function is provided to change collectively the mode of all the indoor units connected to the same system for the fan test operation mode by using switches on the interface P.C. board of the header unit. <Operation procedure>...
  • Page 56 Function to Start / Stop (ON / OFF)Continued (4) Batch start/stop (ON/OFF) function This function is provided to start/stop collectively all the indoor units connected to the same system by using switches on the interface P.C. board of the header unit. <Operation procedure>...
  • Page 57 (5) Individual start/stop (ON/OFF) individual test operation function This function is provided to start/stop (ON/OFF) individually each indoor unit connected to the same system by using switches on the interface P.C. board of the header unit. Set SW01 [16] and set SW02, SW03 to indoor address No. (1 to 40) to be started (Refer to the following table*) - only the setup indoor unit starts operation.
  • Page 58 Monitor Function of Remote Controller Switch When using a remote controller with the model name RBC-AMT32E, the following monitor functions can be used. Calling of display screen <Content> The sensor temperature or operation status of the remote controller, indoor unit, or the outdoor unit can be known by calling up the service monitor mode from the remote controller.
  • Page 59 CODE No. Data name Display format Unit Remote controller display example Room temperature (During control) ×1 ˚C [0027] = 27˚C Room temperature (Remote controller) ×1 ˚C Indoor suction temperature (TA) ×1 ˚F Indoor coil temperature (TCJ) ×1 ˚F Indoor coil temperature (TC2) ×1 ˚F [0080] = 80˚F...
  • Page 60 7-Segment Display Function 7-segment display on outdoor unit (interface P.C. board) The interface control P.C. board features a 7-segment LED display designed to check operational status. Display items can be changed by changing the combination of the number settings of rotary switches provided on the P.C.
  • Page 61 (1) Display of System Information (Displayed on Header Outdoor Unit Only) SW01 SW02 SW03 Display detail Unused System capacity [..6. 0 t ]~[... 2 0. 0 t ] 6 to 20 Ton No. of outdoor units [...1]~[...2]:1 to 2 B [...P] No.
  • Page 62 7-Segment Display Function (Continued) (2) Display of Outdoor Unit Information (Displayed on Each Outdoor Unit) SW01 SW02 SW03 Display detail Error data Outdoor unit No.: [U1] to [U2] B Check code (only latest one displayed) If there is no check code, [– – –] is displayed. ∗...
  • Page 63 (3) Display of Outdoor Cycle Data (Displayed at Each Outdoor Unit) SW01 SW02 SW03 Display detail Pd pressure data Pd pressure (psi) is displayed in decimal format. ∗ ∗ ∗ P d. ∗ ∗ ∗ Ps pressure data Ps pressure (psi) is displayed in decimal format. P s.
  • Page 64 7-Segment Display Function (Continued) (4) Display of Outdoor Cycle Data (Displayed at Header Unit) * This method is used when displaying follower unit information on the 7-segment display of the header unit. SW01 SW02 SW03 Display detail Error data [U.2] B Check code is displayed (latest one only).
  • Page 65 (5) Display of Indoor Unit Information (Displayed on Header Unit Only) SW01 SW02 SW03 Display detail Indoor BUS communication signal Upon receiving signal: [..1], Other times: [..] receiving status Indoor check code No check code: [– – –] Indoor HP capacity 0.6 to 4.5 ∗...
  • Page 66 Oil Level Judgment Display The current compressor oil level judgment results can be accessed by setting the switches provided on the inter- face P.C. board of an outdoor unit. Perform the checks in accordance with the procedure described below. Operation Procedure (1) Start the operation.
  • Page 67 SHRM-i Outdoor Interface P.C. Board Function Setting Exchange Table Switch/Function Setting Exchange Initial setting Part type Exchange contents at shipment bit 1 Compressor 1 backup OFF: Normal, ON: Backup when compressor 1 was in trouble bit 2 Compressor 2 backup OFF: Normal, ON: Backup when compressor 2 SW06 DIP SW 4 bit...
  • Page 68 Oil Level Judgment Display (Continued) Switching of Jumper Wire/Function Setup Function switching setup × : With jumper, : Without jumper (Cut) Initial setting jumper Part type Exchange contents at shipment Optional function Indoor unit at not selected side is kept with waiting status. Operation mode selection The mode is changed a mode which selected the operation mode of the ×...
  • Page 69 Check Procedure to Search Cause of Compressor Oil Shortage Are the balance pipes of all outdoor units connected to the Open the balance pipe valves fully. same refrigerant line fully open? Are there Correct the miswiring or connection. any miswiring or incorrect TK1: CN531 TK2: CN532 connection of TK1, TK2, TK3, TK4 and TK3: CN533 TK4: CN534...
  • Page 70 Oil Level Judgment Display (Continued) <MMY-MAP0724FT , MAP0964FT and MAP1204FT > ∗ ∗ ∗ Check items and procedures to follow when checking oil circuit with compressor(s) disconnected Check item Location Procedure 1) Pressure nitrogen from check joint of the liquid pipe under condition that PMV1, 2 and 4 are fully closed, confirm the pressure using high-pressure check joint.
  • Page 71 Leakage/Clogging of Refrigerating Cycle Circuit List of Check Codes Generated upon Occurrence of Leakage/Clogging in Outdoor Cycle or Oil Circuit Part (MMY-MAP0724FT ∗ Clogging Site of fault Part Check target unit Detected fault and check code Symptom (see next page) Outdoor PMV1, 2, 4 Corresponding unit Activation of high-pressure protection...
  • Page 72 Oil Level Judgment Display (Continued) Fan motor Right side (TO) Main heat exchanger Right side sub heat exchanger PMV 1 PMV 2 Left side PMV 4 Main heat exchanger (TE 1) Left side sub heat exchanger (TE 2) (SV 11) 4-way valve (SV 5)
  • Page 73 List of Check Codes Generated upon Occurrence of Leakage/Clogging in Outdoor Cycle or Oil Circuit Part (MMY-MAP0964FT ∗ , MAP1204FT ∗ Clogging Site of fault Part Check target unit Detected fault and check code Symptom (see next page) Outdoor PMV1, 2, 4 Corresponding unit Activation of high-pressure protection Rise of abnormal pressure...
  • Page 74 Oil Level Judgment Display (Continued) Fan motor Right side (TO) Main heat exchanger Right side sub heat exchanger PMV 2 Left side PMV 1 PMV 4 Main heat exchanger (TE 1) Left side sub heat exchanger (TE 2) 4-way (SV 11) valve (TS 1) pressure...
  • Page 75 Flow Selector Unit...
  • Page 76 Flow Selector Unit (Continued)
  • Page 77 <REFERENCE> An Example of Refrigerant Flow in FS Unit When Trouble Occurred Indoor unit Cool/Heat FS unit...
  • Page 78 Flow Selector Unit (Continued) Troubleshooting when Multiple Indoor Units are Connected to Cool/Heat FS Unit When multiple indoor units are connected to a Cool/Heat FS unit, it is necessary to set the Code No. [ If this setting is forgotten, normal operation is impossible. [Case that Code No.
  • Page 79 Backup Operation This product offers backup modes of operation to tide over certain emergency situations. If a fault occurs in one of the compressors, it is possible to operate the system on an emergency basis by operating only the remaining compressor(s), (compressor backup operation).
  • Page 80 Backup Operation (Continued) Compressor Backup Operation Setting <Outline> If a fault occurs to one of the compressors installed in outdoor unit, follow the procedure described below to back up the faulty compressor by using the remaining, normal compressor(s). <Work Procedure> (1) Turn off the power supply to all the outdoor units connected to the system.
  • Page 81 Backup Setup for Outdoor Unit Outline In this model, setup of the backup operation is available in either the header unit or the follower unit in a situation where the outdoor units are defective. In a system in which two or more outdoor units are connected, carry out the backup operation on the outdoor unit if the error modes described below occur.
  • Page 82 Outdoor Unit Refrigerant Recovery Method Refrigerant Recovery from Failed Outdoor Unit (Pump-Down) This product supports refrigerant pump-down, a function which allows refrigerant to be recovered from an outdoor unit in need of repair using a normal outdoor unit in a system featuring multiple outdoor units. Note for refrigerant recovery operation When performing pump-down operation, take note of the following matters: Note 1:...
  • Page 83 (6) Approx. 10 minutes after the system starts up, fully close the gas pipe service valve of the failed outdoor unit. (7) Push SW04 of the failed outdoor unit to have pressure data (MPa) displayed. (The display switches each time SW04 is pushed.) Display Example [rd] […11] [Pd] [1.20]...
  • Page 84 Outdoor Unit Refrigerant Recovery Method (Continued) [Setup of the power cannot be turned on the failed outdoor unit] If the power cannot be turned on the failed outdoor unit, the solenoid valves and PMVs of the unit cannot be turned on, so that it reduces the amount of recovered refrigerant compared to a standard pump-down operation.
  • Page 85 [Setup of failed outdoor unit] (11) When the manifold gauge pressure of the failed outdoor unit falls below 14.5 psi (0.10 MPa), fully close the balance pipe packed valve, and push SW05 on the interface P.C. board to finish the test cooling operation. (12) Turn off the power supply to all the outdoor units, and recover the residual refrigerant in the outdoor unit using a refrigerant recovery device.
  • Page 86 Outdoor Unit Refrigerant Recovery Method (Continued) How to Operate System While Failed Outdoor Unit Being Repaired <Outline> After refrigerant is recovered from the failed outdoor unit through a pump-down operation, the overall amount of refrigerant held by the system becomes excessive, and this makes it impossible to operate the remaining outdoor units even though they are not faulty.
  • Page 87 Work procedure after Repair When vacuuming in the repaired outdoor unit, follow the procedure described below. <Work procedure> (1) Fully open PMV1 and 2 and PMV4 in accordance with the table below. Note: PMV full-opening operation via short-circuiting of the CN30 pins is automatically undone after 2 minutes, causing the valves to fully close.
  • Page 88 Replacing Compressors WARNING In situations such as indoor unit relocation and START repairs, it is not possible to recover all the refrig- erant held by the system in the outdoor units. It could cause a serious accident, such as blow Is the outdoor unit the only one in the system? out or injury.
  • Page 89 Replacement of Compressors <Checking color of oil in faulty compressor> • Lay the faulty compressor down, draw a small amount of oil via the oil equalization pipe, and check its color against color samples. • Determine the number of compressors to be replaced according to the color checking result. ASTM grade: Below 4 →...
  • Page 90 Replacing Compressors (Continued) [When replacing normal as well as faulty compressor] - applicable to MMY-MAP072 ∗ <Dismantling normal compressor> • Dismantle the normal compressor in the same way as the faulty compressor. Note: • Be sure to insulate the removed compressor leads using insulation tape, etc. WARNING When detaching a pipe by heating with a burner a welded joint, take care as any oil left in the piping may burn in a momentary flash of fire when the weld filler metal melts.
  • Page 91 [When replacing normal as well as faulty compressors] - applicable to MMY-MAP096 , MAP120 ∗ ∗ <Dismantling normal compressors> • Dismantle the normal compressors in the same way as the faulty compressor. Note: • Be sure to insulate the removed compressor leads using insulation tape, etc. WARNING When detaching a pipe by heating with a burner a welded joint, take care as any oil left in the piping may burn in a momentary flash of fire when the weld filler metal melts.
  • Page 92 Replacing Compressors (Continued) <Installing compressor> • Install a compressor by following the dismantling procedure in reverse. WARNING The dismantling process may have loosened compressor leads and faston connectors. Prior to installa- tion, therefore, tighten them a little with a pair of pliers, and verify that they are tight after reconnection. Notes: •...
  • Page 93 Reference - 1 Pressure Sensor Output Check Outdoor Unit Pd sensor characteristics 0 to 4.41 MPa (0.5 to 5V output for 0 to 4.41 MPa) Voltage readings across pins 2 and 3 of CN501 on indoor unit main P.C. board (with negative-side probe of multim- eter placed on pin 3) VOLT VOLT...
  • Page 94 Reference - 1 (Continued) Outdoor Unit Ps sensor characteristics 0 to 1.47 MPa (0.5 to 5V output for 0 to 1.47 MPa) Voltage readings across pins 2 and 3 of CN500 on indoor unit main P.C. board (with negative-side probe of multim- eter placed on pin 3) VOLT VOLT...