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38AUZA14
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Carrier 38AUZA14 [31/40] Condenser fans

Fig. 27 — Typical Exterior, Single-Circuit Unit (38AUZ*08 shown)

Fig. 28 — Typical Interior, Single-Circuit Unit (38AUZ*08 shown)

Condenser Fans

Service

Valves

HPS

LPS

High Flow

Access Port

32LT Sensor

Typical Location

Outdoor Coil

Содержание

Air cooled condensing units 50 hz with puro 1
Contents 1
Installation start up and service instructions 1
R 410a refrigerant sizes 07 14 1
Safety considerations 1
Installation 2
Installation guideline 2
Replacement retrofit r22 to puro 2
Fig 1 38au 07 14 unit dimensions 3
Table 1a physical data 38auz 07 08 units 50 hz english 4
Table 1b physical data 38auz 07 08 units 50 hz si 5
Table 2a physical data 38aud 12 14 units 50 hz english 6
Table 2b physical data 38aud 12 14 units 50 hz si 7
8 a u z a 0 7 a 0 g 9 0 a 0 a 0 8
Fig 2 model number nomenclature 8
Fig 3 serial number nomenclature 8
Consider system requirements 9
Installation 9
Jobsite survey 9
Matching 38au model to evaporator coil 9
Slab mount 9
Step 1 plan for unit location 9
Step 2 complete pre installation checks 9
Step 3 prepare unit mounting support 9
Step 4 rig and mount the unit 9
Check 38au model with evaporator coil con nections confirm before installation of unit that the evaporator coil connections are consistent with this 38au model see table 3 on page 9 determine refrigerant line sizes select the recommended line sizes for 38auz and 38aud unit from the appropriate tables 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 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 10
Faces plywood sheets may be placed against the sides of the unit behind cables run cables to a central suspension point so that the angle from the horizontal is not less than 45 degrees raise and set the unit down carefully if it is necessary to roll the unit into position mount the unit on longitudinal rails using a minimum of 3 rollers apply force to the rails not the unit if the unit is to be skidded into position place it on a large pad and drag it by the pad do not apply any force to the unit raise from above to lift the unit from the rails or pad when unit is in its final position after the unit is in position remove all shipping materials and top crating 10
Important a refrigerant receiver is not provided with the unit do not install a receiver 10
Important do not bury refrigerant piping underground 10
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 feet of elevation that a liquid line size can accommodate longer linear tube lengths will also reduce the amount of liquid lift possible check tables 5 38auz and 6 38aud 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 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 10
Provide safety relief the 38au unit is provided with a fusible joint in the suction line in accordance with applicable ul standards for pressure 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 model 38aud has two separate refrigeration systems if required each circuit will require a field supplied installed supplemental relief device 10
Step 5 complete refrigerant piping connections 10
Table 4 equivalent lengths for common fittings ft 10
Table 5 38auz 07 08 piping recommendations single circuit unit 11
Table 6 38aud 12 14 piping recommendations two circuit unit 11
Table 7 38au maximum suction pipe size 11
Alc 066208 amg 24 50 60 hmi 1tt3 provided with unit see table 8 13
Alc 066209 amg 24 50 60 hmi 1tt4 13
Alc 066212 amg 24 50 60 hmi 1tt5 13
Aud units require two sets of parts 13
Dual circuit coil piping configuration for single compressor condensing units 13
Fig 7 location of sight glass es and filter driers typical 38auz systems 13
Legend txv thermostatic expansion valve 13
Liquid line size in liquid line solenoid valve llsv llsv coil sight glass filter drier 13
Refer to table 9 for recommendations on refrigeration specialties in some applications depending on space and convenience re quirements it may be desirable to install 2 filter driers and sight glasses in a single circuit application one filter drier and sight glass may be installed at a locations in fig 7 or 2 filter driers and sight glasses may be installed at b locations select the filter drier for maximum unit capacity and minimum pressure drop complete the refrigerant piping from the indoor unit to the outdoor unit before opening the liquid and suction lines at the outdoor unit install liquid line solenoid valve it is recommended that a solenoid valve be placed in the main liquid line see fig 7 between the condensing unit and the evaporator coil locate the solenoid valve at the outlet end of the liquid line near the evaporator coil connections with flow direction arrow pointed at the evaporator coil refer to table 9 a liquid line solenoid valve is required when the liquid line leng 13
Single circuit coil piping configuration for single compressor condensing units 13
Table 9 refrigerant specialities part numbers 13
Step 6 install accessories 14
Step 7 complete electrical connections 14
Convenience outlets 15
Units with disconnect option 15
Units without disconnect option 15
Installing weatherproof cover 16
230 3 60 380 420 10 74 10 74 270 0 2 25 30 27 30 18
230 3 60 380 420 7 51 7 51 270 0 2 19 25 21 30 18
3 50 380 420 12 101 270 0 2 16 25 19 30 18
3 50 380 420 9 64 270 0 2 13 20 15 25 18
Determine maximum deviation from average voltage ab 227 224 3 v bc 231 227 4 v ac 227 226 1 v maximum deviation is 4 v determine percent of voltage imbalance 18
Ergize economizer control relay and electric heater contactors or relays maximum available power is 20 va check concur rent loadings by external control devices if the maximum con current loading exceeds 20 va purchase and install the accesso ry transformer relay package available for 208 230 and 460 v units control transformer tran3 provides control power through terminals a1 9 and a2 10 to c for liquid line solenoids maximum available power is 40 va these outputs are switched on off by the solenoid valve relays 18
Example supply voltage is 230 3 60 18
External devices the 38au control transformers provide 24 v nec class 2 power sources to energize external control de vices these devices will include the indoor fan motor contac tor or control relay these devices may also include liquid line solenoid valve two on 38aud model economizer con trol relay supplemental electric heater contactors or control re lays and other devices selected by system designer control transformer tran1 provides control power through terminal r to c on the ctb s field connection terminal strip for supply fan motor interlock this source may also be used to en 18
Full load amps 18
Locked rotor amps 18
Maximum overcurrent protection 18
Minimum circuit amps 18
National electrical code 18
Rated load amps 18
Table 11 electrical data 38auz 07 08 60 hz units 18
Table 12 electrical data 38aud 12 14 60 hz units 18
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 important if the supply voltage phase imbalance is more than 2 contact your local electric utility company immediately 18
Au units 19
Compressor overload 19
Compressor rotation 19
Pre start up 19
Preliminary charge 19
Preliminary checks 19
Start up 19
System check 19
Turn on crankcase heater 19
Adjust refrigerant charge 20
Advanced scroll temperature protection astp 20
Final checks 20
Start unit 20
Base unit controls indoor supply fan 26
Cooling unit with economizer 26
Cooling unit without economizer 26
Heating 26
Operating sequence 26
Quarterly inspection and 30 days after initial start 26
Routine system maintenance 26
Seasonal maintenance 26
Compressor oil 27
Factory high flow access ports 27
Field refrigerant access ports 27
Liquid line filter drier 27
Refrigeration system 27
Seat core 27
Service 27
Servicing systems on roofs with synthetic materials 27
Comfort alert diagnostic module 28
Table 13 led status codes 29
Advanced scroll temperature protection astp see advanced scroll temperature protection astp on page 21 30
Compressor overtemperature protection ip a thermostat installed on the compressor motor wind ing reacts to excessively high winding temperatures and shuts off the compressor crankcase heater the heater minimizes absorp tion 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 30
Compressor protection 30
Crankcase heater 30
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 30
Fan motors have sealed bearings no provisions are made for lubrication 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 30
High pressure switch 30
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 pro longed shutdown on a service job energize the crankcase heater for 24 hours before starting the compressor 30
Low pressure switch 30
Lubrication 30
Outdoor fans 30
Table 14 cadm troubleshooting 30
The 38au high pressure switch is stem mounted on the discharge line the switch is a fixed non adjustable type 30
The 38au low pressure switch is stem mounted on the suction line switches are all fixed non adjustable type 30
The heater prevents refrigerant migration and compressor oil dilution during shutdown when ever compressor is not operating the heater is wired to cycle with the compressor the heater is off when compressor is run ning and on when compressor is off the crankcase heater will operate as long as the power circuit is energized 30
Condenser fans 31
Fig 27 typical exterior single circuit unit 38auz 08 shown 31
Fig 28 typical interior single circuit unit 38auz 08 shown 31
Service valves 31
Condenser fans 32
Fig 29 typical exterior two circuit unit 38aud 14 shown 32
Fig 30 typical interior two circuit unit 38aud 14 shown 32
Service valves 32
Fastener torque values 33
Novation coil cleaning and maintenance 33
Repairing novation condenser tube leaks 33
Replacing novation condenser coil 33
Service parts 33
Troubleshooting 34
Troubleshooting cont 35
Air conditioner and heat pump with puro 36
Appendix a 36
Appendix b 36
Quick reference guide 36
Wiring diagram list 36
Appendix c 37
Mm 10 in 37
Motormaster sensor locations 37
Sensor 37
Catalog no 38au c01si 38
I preliminary information 39
Ii pre start up 39
Iii start up start up checklist 39

Carrier 38AUZA14 [31/40] Condenser fans

Содержание

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