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38AUDA16
Руководство по обслуживанию Страница: 22

Carrier 38AUDA16 Руководство по обслуживанию онлайн [22/40] 359835

C10085

Fig. 19 -- Typical 38AUD*25 Wiring Diagram

38AUD

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Aud air cooled condensing units 50 hz with puro 1
Contents 1
Installation start up and service instructions 1
R 410a refrigerant sizes 16 25 1
Caution 2
Installation guideline 2
Replacement retrofit r22 to puro 2
Safety considerations 2
Warning 2
Caution 3
Fig 1 38aud 16 unit dimensions 3
If required install a 100 activated alumina suction line filter drier at the outdoor unit 8 evacuate and charge the system according to the in structions in this installation manual 9 operate the system for 10 hr monitor the pressure drop across the suction line filter drier if pressure drop exceeds 21kpa 3 psig replace suction line and liquid line filter driers be sure to purge system with dry nitrogen and evacuate when replacing filter driers continue to monitor the pressure drop across suction line filter drier repeat filter changes is neces sary never leave suction line filter drier in system longer than 72 hr actual time 3
Installation 3
R 410a 4 remove the existing outdoor unit install the new out door unit according to these installation instructions 5 install a new field supplied liquid line filter drier at the indoor coil just upstream of the txv or fix orifice metering device 6 if a suction line filter drier is also to be installed in stall suction line drier downstream of suction line ser vice valve at condensing unit 3
Remove the existing evaporator coil or fan coil and install the replacement coil when appropriate 2 drain oil from low points and traps in suction line tubing and hot gas bypass tubing if appropriate and evaporator if they were not replaced removing oil from evaporator coil may require purging of the tubing with dry nitrogen 3 unless indoor unit is equipped with a puron ap proved metering device change the metering device to a thermal expansion valve txv designed for puro 3
System 3
Unit damage hazard failure to follow this caution may result in equipment damage or improper operation never install suction line filter drier in the liquid line of a puro 3
Fig 2 38aud 25 unit dimensions 4
Table 1a physical data 38aud 16 25 units 50 hz si 5
Table 1b physical data 38aud 16 25 units 50 hz english 6
8 a u d a 2 5 a 0 g 9 a 0 a 0 a 0 7
Before unpacking this new 38aud model compare the evaporator coil design to the 38aud model 7
Complete the following checks before installation 7
Consult local building codes or the u s a national electrical code ref ansi nfpa 70 american na tional standards institute national fire protection as sociation latest revision for special installation re quirements 2 determine unit location from project plans or select unit location 3 check for possible overhead obstructions which may interfere with unit lifting or rigging 7
Fig 3 model number nomenclature 7
Fig 4 serial number nomenclature 7
Installation 7
Jobsite survey 7
Matching 38aud to evaporator coil 7
The model 38aud is a dual circuit unit design that requires two sets of refrigeration piping between the outdoor unit and the evaporator coil or coils this model can only be connected to an evaporator coil that has two refrigeration circuits or to two separate evaporator coils the model 38aud cannot be connected to a single circuit evaporator coil the model 38aud cannot be field converted to a single circuit design 7
Caution 8
Slab mount 8
Step 1 plan for unit location 8
Step 2 complete pre installation checks 8
Step 3 prepare unit mounting support 8
Step 4 rig and mount the unit 8
Check 38aud unit with evaporator coil connections confirm before installation of unit that the evaporator coil connections are consistent with this 38aud unit 9
Check table 5 for maximum suction tube size for 38aud units at minimum load conditions consider suction speed riser reduced tube size for vertical segment only or double suction riser arrangement if the recommended suction tube size does not provide necessary minimum flowrates for this riser 9
Check tables 4 for maximum liquid lift capabilities for line sizes reselect the liquid line tube size if necessary if maximum available tube size cannot provide the required lift distance on this installation relocate the outdoor unit to reduce the equivalent line length or the lift requirement 9
Determine equivalent line length adjustments for path and components and add to linear line lengths see table 4 equivalent lengths for common fittings for usual fitting types also identify adjustments for refrigeration specialties refer to part 3 of the carrier system design manual for additional data and information on equivalent lengths 9
Determine refrigerant line sizes select the recommended line sizes for the 38aud unit see tables 3 and 4 9
Determine the linear length of interconnecting piping required between the outdoor unit and indoor unit evaporator consider and identify also the arrangement of the tubing path quantity and type of elbows in both lines liquid line solenoid size filter drier and any other refrigeration specialties located in the liquid line refer to the indoor unit installation instructions for additional details on refrigeration specialties devices 9
Important a refrigerant receiver is not provided with the unit do not install a receiver 9
Important do not bury refrigerant piping underground 9
Liquid lift a liquid lift condition exists when the outdoor unit is located below the indoor evaporator unit and liquid flows vertically up in a portion of the liquid line the vertical column of liquid reduces the available state point subcooling at the evaporator coil s thermal expansion valve this effect reduces the length of liquid lift meters feet of elevation that a liquid line size can accommodate longer linear tube lengths will also reduce the amount of liquid lift possible 9
Note equivalent line lengths will vary based on tube diameter calculate equivalent line length for each pipe by adding equivalent length adjustments to linear lengths for each pipe 9
Provide safety relief if local codes dictate an additional safety relief device purchase locally and install locally installation will require the recovery of the factory shipping charge before the factory tubing can be cut and the supplemental relief device is installed 9
Step 5 complete refrigerant piping connections 9
Suction riser a suction riser condition exists when the outdoor unit is located above the indoor evaporator unit and suction vapor must flow vertically up to return to the compressor oil return is a concern when the suction tube size is too large to produce the minimum refrigerant velocity to ensure oil return at minimum load conditions 9
Table 3 equivalent lengths for common fittings ft 9
The 38aud has two separate refrigeration systems if required each circuit will require a field supplied installed supplemental relief device 9
Aud maximum suction pipe size 10
Hot gas bypass hot gas bypass if used should be introduced before the evaporator a bypass route that also bypasses the evaporator circuit may lead to oil trapping in the evaporator circuit during low load conditions and then to oil slugging as evaporator load increases model 38aud units do not include a hot gas stub connection a tee must be field supplied and installed in the compressor discharge line run 10
In od line between outdoor unit and evaporator coil inlet install an auxiliary side connector at the evaporator between txv and distributor follow instructions for the side connector part insulate the hot gas line 10
Insulate suction lines apply closed cell tubular insulation to all suction lines between evaporator coil connection and 38aud unit s suction service valve 10
Table 4 38aud 15 25 piping recommendations two circuit unit 10
Table 5 10
Warning 12
Step 6 install accessories 13
Step 7 complete electrical connections 13
Warning 13
Warning 14
Legend and notes for table 8 16
Table 8 electrical data 38aud 16 25 50 hz units 16
Caution 17
Pre start up 17
Start up 17
System check 17
Caution 18
Aud 16 charging chart puron circuit 1 all condenser fans operating 19
Aud 16 charging chart puron circuit 2 all condenser fans operating 19
Fig 16 38aud 16 charging chart 19
Aud 25 charging chart puron circuit 1 4 condenser fans operating 20
Aud 25 charging chart puron circuit 2 4 condenser fans operating 20
Fig 17 38aud 25 charging chart 20
Base unit controls 23
Operating sequence 23
Caution 24
Compressor oil 24
Refrigeration system 24
Routine system maintenance 24
Service 24
Comfort alert diagnostic module 25
Seat core 25
Table 9 led status codes 27
Advanced scroll temperature protection astp see advanced scroll temperature protection astp on page 18 28
Compressor has its own oil supply loss of oil due to a leak in the system should be the only reason for adding oil after the system has been in operation 28
Compressor overtemperature protection ip a thermostat installed on the compressor motor winding reacts to excessively high winding temperatures and shuts off the compressor 28
Compressor protection 28
Crankcase heater the heater minimizes absorption of liquid refrigerant by oil in the crankcase during brief or extended shutdown periods the main disconnect must be on to energize the crankcase heater 28
Crankcase heater the heater prevents refrigerant migration and compressor oil dilution during shutdown whenever compressor is not operating the heater is wired to cycle with the compressor the heater is off when compressor is running and on when compressor is off 28
Fan motors have sealed bearings no provisions are made for lubrication 28
High pressure switch the high pressure switch is stem mounted on the discharge line the switch is a fixed non adjustable type 28
Important never open any switch or disconnect that energizes the crankcase heater unless unit is being serviced or is to be shut down for a prolonged period after a prolonged shutdown on a service job energize the crankcase heater for 24 hours before starting the compressor 28
Low pressure switch the low pressure switch is stem mounted on the suction line switches are all fixed non adjustable type 28
Lubrication 28
Outdoor fans each fan is supported by a formed wire mount bolted to the fan deck and covered with a wire guard fan motors have permanently lubricated bearings 28
Table 10 cadm troubleshooting 28
The crankcase heater will operate as long as the power circuit is energized 28
Fig 22 38aud size 16 cabinet 29
Fig 23 38aud 16 piping 29
Access panel control box compressors 30
C10089 30
C10090 30
Condenser fans motors 30
Fig 24 38aud size 25 cabinet 30
Fig 25 38aud 25 piping 30
Service valves 30
Caution 32
Repairing novation condenser tube leaks 32
Replacing novation condenser coil 32
Caution 33
Fastener torque values 33
Troubleshooting 34
Troubleshooting cont 35
Air conditioner heat pump with puro 36
Appendix a 36
Appendix b 36
Quick reference guide 36
Wiring diagram list 36
Appendix c 37
Motormaster sensor locations 37
Catalog no 38au c02si 38
Controls 39
I preliminary information 39
Ii pre start up outdoor unit 39
Indoor unit 39
Piping 39
Start up checklist 39
Check voltage imbalance 40

Carrier 38AUDA16 Руководство по обслуживанию онлайн [22/40] 359835

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