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Nitrogen Purge for MDC Brazing —

• Expansion Valves (EXVA~C) in MDC units are shipped from factory and opened to 120 pulses
• Expansion valves for indoor units also have an initial opening from the factory
• During brazing, purge with high-purity nitrogen from ODU high and low pressure service valves. Recommended nitrogen

flow rate is approximately 1.76 ft

3

/h*. This is brazing sequence for

* Note that

the flow capacity through this system is limited, so you cannot “blow” through the lines with a high

flow of nitrogen. The line can only be slowly purged according to the flow rate mentioned above.

2

1

3

Gas/Liquid
separator

Tm3

Tm1

Tm2

SVM

C

EX

VB

EX

VC

SVME

SVP

EXVA

SV1A-1

SV1B-1

SVmA-n

SVmB-n

HEX1

HEX2

Check valves

PS2

PS1

PS3

ODU side

IDU side

1

2

3

N

2

inlet

Fig. 9 —Nitrogen Purge for MDC Brazing

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Содержание 40VMD006-016

Страница 1: ...erstand the signal words DANGER WARNING and CAUTION DANGER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards that could result in personal injury or death CAUTION is used to identify unsafe practices which could result in minor personal injury or product and property damage Recognize safety information This is the safety alert symbol...

Страница 2: ...stem open to air any longer than the actual time required to service the equipment Seal circuits being serviced and charge with dry nitrogen to prevent oil contamination when timely repairs cannot be completed Failure to follow these procedures may result in damage to equipment For information about replacement oil type and viscosity see the Installation Start Up and Service Instructions for the 3...

Страница 3: ...ight lb 126 168 130 203 137 209 183 262 DESIGN PRESSURE High Low psig 580 320 CONNECTING WIRING Power Wiring Sized per NEC and local codes based on nameplate electrical data Signal Wiring 2 core shielded twisted pair cable 18 AWG CONDENSATE DIAMETER OD in 1 LEGEND AWG American Wire Gage NEC National Electrical Code NOTE All dimensions shown in inches 40VMD MODEL SIZE DIMENSIONS in A B C D E F G H ...

Страница 4: ... shown in inches Fig 3 40VMD Dimensional Drawing Sub MDC 40VMD MODEL SIZE DIMENSIONS in A B C D E F G 006 37 33 7 8 27 1 2 22 5 8 13 7 8 12 7 8 33 7 9 008 010 016 46 1 2 43 1 4 44 7 8 43 1 4 B C E F G D 1 5 8 1 2 A 3 4 1 2 ...

Страница 5: ...he sub MDC Adapter pipe for low pressure line 2 Adapter pipe for high pressure line 2 Clamp 2 To fasten the connector between flexible condensate pipe and MDC condensate Condensate connection 2 Reducer for smaller pipe diameter only for size 018 unit PQE connection wire No of Ports 3 Connect outdoor unit indoor unit and MDC Adapter pipe for High pressure line 1 Only for 40VMD016ML 3 used for conne...

Страница 6: ... on unit to determine if shipping screws are to be removed Remove screws as directed Step 2 Position the Unit Install the unit in a location that meets the following requirements Allow adequate space for installation service clearance piping and electrical connections For specific unit dimensions refer to Table 1 and Fig 2 Allow clearance according to local and national codes Confirm that the ceil...

Страница 7: ...s Recommended nitrogen flow rate is approximately 1 76 ft3 h This is brazing sequence for Note that the flow capacity through this system is limited so you cannot blow through the lines with a high flow of nitrogen The line can only be slowly purged according to the flow rate mentioned above 2 1 3 Gas Liquid separator Tm3 Tm1 Tm2 SVMC EXVB EXVC SVME SVP EXVA SV1A 1 SV1B 1 SVmA n SVmB n HEX1 HEX2 C...

Страница 8: ...acceptable refer to the refrigerant piping allowable limits in the manual Refrigerant piping connection between indoor units should be performed once the units are secured at their respective installation locations The refrigeration piping starts at the indoor unit and ends at the MDC Before insulating the suction and liquid refrigeration pipes perform pressure and leak tests For details see the o...

Страница 9: ...necting Liquid Pipes to the Indoor Unit Table 7 Combination Table INDOOR UNIT kBtu h LIQUID SIDE in GAS SIDE in 5 7 9 12 15 1 4 1 2 18 24 30 36 48 54 3 8 5 8 72 3 8 7 8 96 3 8 7 8 a c b LEGEND a Cut Here b Brazed Cap c MDC Unit INDOOR UNIT CAPACITY kBtu h CONNECTION DIAGRAM 5 7 9 12 15 18 24 27 30 36 48 54 LEGEND a MDC Unit b Pipe Accessory c Pipe 1 2 d Pipe 5 8 INDOOR UNIT CAPACITY kBtu h CONNECT...

Страница 10: ...he Y joint Table 8 Piping Between the MDC and Y Joint PIPING BETWEEN MDC AND SUB MDC Three pipes are used to connect the main MDC and the sub MDC Selection of the Sub MDC should follow the requirements of Table 9 For connecting the sub MDC to main MDC use the high pressure low pressure and liquid pipes as shown in Figs 11 and 12 Table 9 Sub MDC Selection CAUTION Connecting an indoor unit with a ca...

Страница 11: ... Single Sub MDC Fig 12 Connecting Main MDC to Two Sub MDCs Main MDC unit Outdoor unit Indoor Sub MDC1 Sub MDC2 unit Indoor Indoor unit High pressure pipe pipe Low pressure Liquid pipe High pressure pipe pipe Low pressure Liquid pipe High pressure pipe pipe Low pressure Liquid pipe Drain pipe Low pressure High pressure Drain pipe Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe Liquid pipe Drain ...

Страница 12: ...or a typical example of running the refrigerant pipes see Fig 14 INDOOR UNIT CAPACITY kBtu h CONNECTION DIAGRAM 72 73 108 109 168 LEGEND a MDC Unit b Sub MDC Pipe Accessory c Pipe 3 4 d Cut Here e Pipe 7 8 f Pipe 1 1 8 b c a a b d e a f INDOOR UNIT CAPACITY kbtu h CONNECTION DIAGRAM 72 73 126 127 168 LEGEND a Sub MDC unit b Pipe Accessory c Pipe 5 8 d Cut here e Pipe 3 4 f Pipe 7 8 ...

Страница 13: ... PS Pressure Sensor SV A SV B SVM SVP Solenoid Valve Tm Temperature Sensor Check valves PS3 Tm2 SVP EXVA Tm3 SV1A 1 SV1B 1 SVmA n SVmB n HEX2 separator Gas Liquid Tm3 Tm1 Tm2 SVMC EXVB EXVC SVME SVP EXVA SV1A 1 SV1B 1 SVmA n SVmB n HEX1 HEX2 Check valves PS2 PS1 PS3 IDU Side ODU Side MDC a h b c a ...

Страница 14: ...NO 1 Sub MDC Unit MDC Indoor NO 1 Indoor NO 2 Indoor NO 3 Indoor NO 4 Indoor NO 5 Indoor MDC Outdoor or Sub MDC Outdoor Sub MDC NO 1 Sub MDC Unit 6 5 4 3 1 2 Main MDC Unit Indoor Unit NO 3 NO 4 Indoor Unit NO 1 Indoor Unit S8 ON 6 5 4 3 2 1 MDC Main MDC or Sub MDC Main MDC Sub MDC P Q P Q P Q P Q NO 2 Sub MDC Unit S8 ON 6 5 4 3 2 1 NO 2 Sub MDC Unit MDC Indoor NO 1 Indoor NO 2 Indoor NO 3 Indoor N...

Страница 15: ...he outdoor unit should be in the closed position throughout the refrigerant piping process Failure to follow this procedure may result in equipment damage OUTDOOR MODEL kBtu h HIGH PRESSURE SIDE in LOW PRESSURE SIDE in 72 5 8 3 4 96 3 4 7 8 120 1 1 8 145 7 8 168 192 216 1 1 8 240 1 3 8 240L 288 312 336 1 5 8 Fig 15 Typical Piping Layout Between Outdoor Unit and MDC LEGEND G H Y Y Joint Outdoor uni...

Страница 16: ... 8 WARNING Electrical shock can cause personal injury and death Disconnect power supply before making wiring connections There may be more than one disconnect switch Tag all disconnect locations to alert others not to restore power until work is completed b c a a b d e a f a g h a j h D a j k WARNING All units must be wired strictly in accordance with the wiring diagram furnished with the unit Any...

Страница 17: ...re the power wiring and control wiring do not cross as this might cause disturbance on the controls side Use 2 core stranded shielded twisted pair communication wire Make sure the control wire does not form a closed loop The control wire is polarity sensitive Figures 20 and 21 show how to connect the control wiring between the MDC and the indoor unit Wiring length limitations must be followed to a...

Страница 18: ...HA HB HA HB HA HB HA HB HA HB P Q P Q P Q P Q P Q P Q wired controller HA HB To No 1 indoor To No 2 indoor To No 3 indoor To No 1 indoor To No 2 indoor To outdoor To Sub MDC To outdoor L1 L2 L3 L3 L3 L3 L3 L5 L6 L7 L10 L11 Main MDC unit L4 P Q HA HB L8 L9 HA HB Note Power from IDU Note 24v AC Power r e l l o r t n o C d e z i l a r t n e C Maximum Wiring Length L1 L2 L5 3937 ft 18AWG 2 Core Strand...

Страница 19: ... I 4 M I CN59 5 M I 6 M I CN60 7 M I 8 M I CN10 CN12 M O CN13 1 M I 2 M I To outdoor or MDC units communication bus P Q Indoor No 1 P Q Indoor No 2 P Q Indoor No 4 P Q Indoor No 5 P Q Indoor No 6 P Q Indoor No 7 P Q Indoor No 8 P Q Indoor No 10 P Q Outdoor P Q Main MDC Sub MDC P Q P Q Indoor No 3 To indoor units communication bus Indoor No 9 To indoor units communication bus T3 CN27 CN45 CN1 T1 T2...

Страница 20: ...OORZ ODFN CN38 69 CN37 69 CN36 69 CN35 69 CN34 69 CN33 69 69 69 69 69 69 69 69 69 69 69 69 69 69 69 69 69 CN42 CN43 CN41 CN44 693 3803 690 690 HOORZ ODFN CN40 CN39 69 69 HOORZ ODFN HOORZ ODFN HOORZ ODFN HOORZ ODFN HOORZ ODFN HOORZ ODFN HOORZ ODFN CN38 69 CN37 69 CN36 69 CN35 69 CN34 69 CN33 69 ODFN ODFN ODFN P Q Indoor No 2 Indoor No 3 P Q Indoor No 4 P Q Indoor No 5 P Q P Q Indoor No 6 Indoor No ...

Страница 21: ...there are no refrigerant leaks 4 Ensure the drain is not clogged 5 Ensure the piping is insulated 6 Ensure the ground wiring is connected correctly 7 Ensure the added refrigerant amount is correct based on the actual pipe length 8 Ensure the supplied power voltage matches the voltage on the unit nameplate 9 Ensure the connected indoor unit quantity during the quick check MDC query is the same as t...

Страница 22: ... S7 the switch must be set to OFF OFF or ON ON v POSITION 1 2 S1 IDU PIPES SETTING OFF OFF Normal Mode default ON ON 2 Ports Twinned Together Fig A S1 S3 S5 and S7 Settings POSITION 1 2 S3 IDU PIPES SETTING OFF OFF Normal Mode default ON ON 2 Ports Twinned Together POSITION 1 2 S5 IDU PIPES SETTING OFF OFF Normal Mode default ON ON 2 Ports Twinned Together POSITION 1 2 S7 IDU PIPES SETTING OFF OFF...

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