![Carrier 38AUZA12 [9/40] Installation](/img/pdf.png)
Carrier 38AUZA12 [9/40] Installation
![Carrier 38AUZA12 [9/40] Installation](/views2/1427905/page9/bg9.png)
9
Matching 38AU Model To Evaporator Coil –
The Model 38AUZ is a single-circuit unit design, requiring one
set of refrigeration piping. This model can be connected to an
evaporator coil with one circuit or with two circuits (by mani-
folding the evaporator connections into a single piping system).
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 connect-
ed 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 de-
sign.
Before unpacking this new 38AU model, compare the evapora-
tor coil design to the 38AU model.
Table 3 — Evaporator Coil Connections
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes or the U.S. A. National Elec-
trical Code (Ref: ANSI/NFPA 70 [American National
Standards Institute/National Fire Protection Association],
latest version) for special installation requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may in-
terfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (pad, rails
or other) that provides for the minimum clearances required for
safety. This includes minimum working space, clearances be-
tween live electrical components and nearest barriers (ground-
ed or ungrounded), clearances for unit performance and service
access below, around and above unit as specified in unit draw-
ings. See Fig. 4.
NOTE: Local codes may require different clearances than
specified in Fig. 4. It is the responsibility of installers to be
knowledgeable in local codes and to modify the recom-
mended clearances to satisfy local codes.
NOTE: Consider also the effect of adjacent units on airflow
performance and control box safety clearance.
Do not install the outdoor unit in an area where fresh air supply
to the outdoor coil may be restricted or when recirculation from
the condenser fan discharge is possible. Do not locate the unit
in a well or next to high walls.
Evaluate the path and required line length for interconnecting
refrigeration piping, including suction riser requirements (out-
door unit above indoor unit), liquid line lift (outdoor unit below
indoor unit) and hot gas bypass line. Relocate sections to mini-
mize the length of interconnecting tubing.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto the
unit.
Fig. 4 — Service Clearance Dimensional Drawing
Step 2 — Complete Pre-Installation Checks
CHECK UNIT ELECTRICAL CHARACTERISTIC —
Confirm before installation of unit that voltage, amperage and
circuit protection requirements listed on unit data plate agree
with power supply provided.
— UNCRATE UNIT — Remove unit packaging except for
the top skid assembly, which should be left in place until after
the unit is rigged into its final location.
INSPECT SHIPMENT — File a claim with shipping compa-
ny if the shipment is damaged or incomplete.
CONSIDER SYSTEM REQUIREMENTS
• Consult local building codes and National Electrical
Code (NEC, U.S.A.) for special installation requirements.
• Allow sufficient space for airflow clearance, wiring,
refrigerant piping, and servicing unit. See Fig.1 for unit
dimensions and weight distribution data.
• Locate the unit so that the outdoor coil (condenser) air-
flow is unrestricted on all sides and above.
• The unit may be mounted on a level pad directly on the
base channels or mounted on raised pads at support
points. See Tables 1A through 2B for unit operating
weights. See Fig. 1 for weight distribution based on rec-
ommended support points.
NOTE: If vibration isolators are required for a particular
installation, use the data in Fig. 1 to make the proper
selection.
Step 3 — Prepare Unit Mounting Support
Slab Mount —
Provide a level concrete slab that extends a minimum of 150
mm (6 in.) beyond unit cabinet. Install a gravel apron in front
of condenser coil air inlet to prevent grass and foliage from
obstructing airflow.
Step 4 — Rig and Mount the Unit
RIGGING — These units are designed for overhead rigging.
Refer to the rigging label for preferred rigging method. Spread-
er bars are not required if top crating is left on the unit. All pan-
els must be in place when rigging. As further protection for coil
Evaporator Coil has Connect to Model Notes
Single Circuit 38AUZ ONLY
Two Circuits
38AUZ
Manifold evaporator
circuits into single
piping system
Or
38AUD
Use two separate
piping systems
DO NOT BURY REFRIGERATION LINES.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
REAR:
Min 457 mm (18”)
requried for service
Note: Observe requirements for 914 mm (39”) operating clearance
on either Left or Rear coil opening.
RIGHT:
Min 457 mm (18”)
requried for service
LEFT:
Min 457 mm (18”)
requried for service
FRONT:
1067 mm (42”)
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
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