Carrier 25HBB Heat Pump User Manual
Contents
1. All indoor coils must be installed with a hard shutoff Puron TXV metering device 25HBB Copyright 2008 Carrier Corp 7310 W Morris St e Indianapolis IN 46231 Printed in U S A Edition Date 04 08 Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 8 Catalog No 25HBB 1SI Replaces NEW2. air temperature entering indoor and outdoor units If pressure and temperature do not match on chart system refrigerant charge may not be correct Do not use chart to adjust refrigerant charge Final Checks IMPORTANT Before leaving job be sure to do the following 1 Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub through or wire pinching 2 Ensure that all wiring and tubing is secure in unit before adding panels and covers Securely fasten all panels and covers 3 Tighten service valve stem caps to 1 12 turn past finger tight 4 Leave Owner s Manual with owner Explain system operation and periodic maintenance requirements outlined in manual 5 Fill out Dealer Installation Checklist and place in customer file CARE AND MAINTENANCE For continuing high performance and to minimize possible equipment failure periodic maintenance must be performed on this equipment Frequency of maintenance may vary depending upon geographic areas such as coastal applications See Users Manual for information PURON R 410A QUICK REFERENCE GUIDE e Puron refrigerant operates at 50 70 percent higher pressures than R 22 Be sure that servicing equipment and replacement components are designed to operate with Puron Puron refrigerant cylinders are rose colored Recovery cylinder service pressure rating must be 400 psig DOT 4BA400 or DOT BW400 Puron systems should be charged with liquid refrig
3. A05227 Fig 5 Liquid Line Filter Drier Evacuate Refrigerant Tubing and Indoor Coil A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Never use the system compressor as a vacuum pump Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns The alternate triple evacuation method may be used see triple evacuation procedure in service manual Always break a vacuum with dry nitrogen 3 25HBB Deep Vacuum Method The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth The deep vacuum method is the most positive way of assuring a system is free of air and liquid water A tight dry system will hold a vacuum of 1000 microns after approximately 7 minutes See Fig 6 5000 4500 4000 3500 9 3000 Q 2500 o 2000 1500 1000 500 LEAK IN SYSTEM VACUUM TIGHT POO WET TIGHT DRY SYSTEM MINUTES A95424 Fig 6 Deep Vacuum Graph Final Tubing Check IMPORTANT Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment Ensure tubes are not rubbing against each other or any sheet metal Pay close attention to feeder tubes makings sure wire ties on feeder tubes are secure and tight Be sure field wiring complies with local and nation
4. makes circuits R O and R Y and R G Circuit R O energizes reversing valve switching it to cooling position Circuit R Y energizes contactor starting outdoor fan motor and compressor circuit R G energizes indoor unit blower relay starting indoor blower motor on high speed When thermostat is satisfied its contacts open de energizing contactor and blower relay Compressor and motors should stop NOTE If indoor unit is equipped with a time delay relay circuit the indoor blower will run an additional 90 seconds to increase system efficiency Heating On a call for heating thermostat makes circuits R Y and R G Circuit R Y energizes contactor starting outdoor fan motor and compressor Circuit R G energizes indoor blower relay starting blower motor on high speed Should temperature continue to fall R W2 is made through second stage room thermostat Circuit R W2 energizes a relay bringing on first bank of supplemental electric heat and providing electrical potential to second heater relay if used If outdoor temperature falls below setting of outdoor thermostat field installed option contacts close to complete circuit and bring on second bank of supplemental electric heat When thermostat is satisfied its contacts open de energizing contactor and relay All heaters and motors should stop Defrost The defrost control is a time temperature control which includes a field selectable quick connects located at board edge time p
5. most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before installing modifying or servicing system main electrical disconnect switch must be in the OFF position There may be more than 1 disconnect switch Lock out and tag switch with a suitable warning label INSTALLATION RECOMMENDATIONS NOTE In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment 1 Locate unit away from windows patios decks etc where unit operation sound may disturb customer 2 Ensure that vapor and liquid tube diameters are appropriate for unit capacity 3 Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends 4 Leave some slack between structure and unit to absorb vibration 5 When passing refrigerant tubes through the wall seal opening with RTV or other pliable silicon based caulk See Fig 1 6 Avoid direct tubing contact with water pipes duct work floor joists wall studs floors and walls 7 Do not suspend refrig
6. or below 15ft 4 57 m respectively For standard refrigerant line lengths 80 ft 24 38 m or less allow system to operate in cooling mode at least 15 minutes If conditions are favorable check system charge by subcooling method If any adjustment is necessary adjust charge slowly and allow system to operate for 15 minutes to stabilize before declaring a properly charged system If the indoor temperature is above 80 F 26 67 C and the outdoor temperature is in the favorable range adjust system charge by weight based on line length and allow the indoor temperature to drop to 80 F 26 67 C before attempting to check system charge by subcooling method as described above If the indoor temperature is below 70 F 21 11 C or the outdoor temperature is not in the favorable range adjust charge for line set length above or below 15ft 4 57 m only Charge level should then be appropriate for the system to achieve rated capacity The charge level could then be checked at another time when the both indoor and outdoor temperatures are in a more favorable range NOTE If line length is beyond 80 ft 24 38 m or greater than 20 ft 6 10 m vertical separation See Long Line Guideline for special charging requirements Heating Check Chart Procedure To check system operation during heating cycle refer to the Heating Check Chart on outdoor unit This chart indicates whether a correct relationship exists between system operating pressure and
7. which melt below 800 F 427 C Consult local code requirements Refrigerant tubing and indoor coil are now ready for leak testing This check should include all field and factory joints TEFLON SEAL K L PISTON PISTON BODY L SWEAT FLARE ADAPTER LIQUID SERVICE VALVE A05226 Fig 4 Liquid Service Valve Table 2 Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters In RATED VAPOR LIQUID up to 80 ft 24 38 m UNIT SIZE Connection Tube Connection Tube Diameter Diameter Diameter Diameter 018 024 3 8 3 8 5 8 5 8 030 036 3 8 3 8 3 4 3 4 042 048 3 8 3 8 7 8 7 8 060 3 8 3 8 7 8 1 1 8 Notes 1 Tube diameters are for total equivalent lengths up to 80 ft 24 38 m 2 Do not apply capillary tube or fixed orifice indoor coils to these units For Tubing Set lengths between 80 and 200 ft 24 38 and 60 96 m horizontal or 20 ft 6 10 m vertical differential 250 ft 76 2 m Tota Equivalent Length refer to the Longline Guideline Air Conditioners and Heat Pumps using Puron Refrigerant Install Liquid Line Filter Drier Indoor Refer to Fig 5 and install filter drier as follows 1 Braze 5 in 127 mm liquid tube to the indoor coil 2 Wrap filter drier with damp cloth 3 Braze filter drier to 5 in 127 mm long liquid tube from step 1 4 Connect and braze liquid refrigerant tube to the filter drier
8. LECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes Connect ground wire to ground connection in control box for safety Connect power wiring to contactor as shown in Fig 7 DISCONNECT PER N E C AND OR LOCAL CODES O eee ee E E HG FIELD POWER MEDOR wenn r 2 O CONTACTOR WIRING GROUND LUG A94025 Fig 7 Line Connections Connect Control Wirin Route 24v control wires through control wiring grommet and connect leads to control wiring See Thermostat Installation Instructions for wiring specific unit combinations See Fig 8 Use No 18 AWG color coded insulated 35 C minimum wire If thermostat is located more than 100 ft 30 5 m from unit as measured along the control voltage wires use No 16 AWG color coded wire to avoid excessive voltage drop All wiring must be NEC Class 1 and must be separated from incoming power leads Use furnace transformer fan coil transformer or accessory transformer for control power 24v 40va minimum NOTE Use of available 24v accessories may exceed the minimum 40va power requirement Determine total transformer loading and increase the transformer capacity or split the loa
9. Pijal Base Series Heat Pumps with Puron Refrigerant 1 1 2 To 5 Nominal Tons Sizes 18 to 60 Turn to the Experts Installation Instructions NOTE Read the entire instruction manual before starting the installation SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses protective clothing and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes and National Electrical Code NEC for special requirements Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand these signal words DANGER WARNING and CAUTION These words are used with the safety alert symbol DANGER identifies the
10. al fire safety and electrical codes and voltage to system is within limits shown on unit rating plate Contact local power company for correction of improper voltage See unit rating plate for recommended circuit protection device NOTE Operation of unit on improper line voltage constitutes abuse and could affect unit reliability See unit rating plate Do not install unit in system where voltage may fluctuate above or below permissible limits A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Installation of filter drier in liquid line is required Make Electrical Connections amp WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Do not supply power to unit with compressor terminal box cover removed NOTE Use copper wire only between disconnect switch and unit NOTE Install branch circuit disconnect of adequate size per NEC to handle unit starting current Locate disconnect within sight from and readily accessible from unit per Section 440 14 of NEC Route Ground and Power Wires Remove access panel to gain access to unit wiring Extend wires from disconnect through power wiring hole provided and into unit control box Connect Ground and Power Wires Connect ground wire to ground connection in control box for safety Connect power wiring to contactor as shown in Fig 7 A WARNING E
11. d with an accessory transformer as required Final Wiring Check IMPORTANT Check factory wiring and field wire connections to ensure terminations are secured properly Check wire routing to ensure wires are not in contact with tubing sheet metal etc Compressor Crankcase Heater When equipped with a crankcase heater furnish power to heater a minimum of 24 hr before starting unit To furnish power to heater only set thermostat to OFF and close electrical disconnect to outdoor unit A crankcase heater is required if refrigerant tubing is longer than 80 ft Refer to the Long Line Guideline Residential Split System Air Conditioners and Heat Pumps Install Electrical Accessories Refer to the individual instructions packaged with kits or accessories when installing Start Up A CAUTION PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury Wear safety glasses protective clothing and gloves when handling refrigerant and observe the following e Front seating service valves are equipped with Schrader valves A CAUTION ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage Federal regulations require that you do not vent refrigerant to the atmosphere Recover during system repair or final unit disposal A CAUTION UNIT OPERATION AND SAFETY HAZARD Failure to follow this caution may result in personal injury equipment damage or improper operat
12. erant Use a commercial type metering device in the manifold hose when charging into suction line with compressor operating Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low side retard Use hoses with 700 psig service pressure rating Leak detectors should be designed to detect HFC refrigerant Puron as with other HFCs is only compatible with POE oils Vacuum pumps will not remove moisture from oil Do not use liquid line filter driers with rated working pressures less than 600 psig Do not leave Puron suction line filter driers in line longer than 72 hours Do not install a suction line filter drier in liquid line POE oils absorb moisture rapidly Do not expose oil to atmosphere POE oils may cause damage to certain plastics and roofing materials Wrap all filter driers and service valves with wet cloth when brazing A factory approved liquid line filter drier is required on every unit Do NOT use an R 22 TXV If indoor unit is equipped with an R 22 TXV or piston metering device it must be changed to a hard shutoff Puron TXV Never open system to atmosphere while it is under a vacuum When system must be opened for service recover refrigerant evacuate then break vacuum with dry nitrogen and replace filter driers Evacuate to 500 microns prior to recharging Do not vent Puron into the atmosphere Do not use capillary tube coils Observe all warnings cautions and bold text
13. erant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing See Fig 1 8 Ensure that tubing insulation is pliable and completely surrounds vapor tube 9 When necessary use hanger straps which are 1 in wide and conform to shape of tubing insulation See Fig 1 10 Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation NOTE Avoid contact between tubing and structure OUTDOOR WALL INDOOR WALL CAULK 1 7 ee T ay l F LIQUID TUBE A S INSULATION THROUGH THE WALL a OST HANGER STRAP AROUND VAPOR N INSULATION 0 EE VAPOR TUBE O O fe 1 MIN e X LIQUID TUBE SUSPENSION A94028 Fig 1 Connecting Tubing Installation When outdoor unit is connected to factory approved indoor unit outdoor unit contains system refrigerant charge for operation with ARI rated indoor unit when connected by 15 ft 4 57 m of field supplied or factory accessory tubing For proper unit operation check refrigerant charge using charging information located on control box cover and or in the Check Charge section of this instruction IMPORTANT Maximum liquid line size is 3 8 in OD for all residential applications including line line IMPORTANT Always install the factory supplied liquid line filter drier Obtain replacement filter driers from your distributor or branch 25HBB INSTALLATION Check Equipment and J
14. eriod between defrost cycles 30 60 or 90 minutes factory set to 90 minutes 25HBB The electronic defrost timer sequence is enabled when the T1 input on the board is energized The timer starts only when the defrost thermostat is closed and the contactor is energized Defrost mode is identical to cooling mode except that outdoor fan motor stops and second stage heat is turned on to continue warming conditioned spaces To initiate defrost the defrost thermostat must be closed This can be accomplished as follows 1 Turn off power to outdoor unit 2 Disconnect outdoor fan motor lead from OF2 on control board see Fig 9 Tape lead to prevent grounding 3 Restart unit in heating mode allowing frost to accumulate on outdoor coil 4 After a few minutes in heating mode liquid line temperature should drop below closing point of defrost thermostat approximately 30 F 1 11 C 5 Short between speedup terminals with a flat blade screwdriver This reduces the timing sequence to 1 256th of original time See Table 4 6 When you hear reversing valve change position remove screwdriver immediately otherwise control will terminate normal 10 minute defrost cycle in approximately 2 seconds NOTE Length of defrost cycle is dependent upon length of time it takes to remove screwdriver from test pins after reversing valve has shifted 7 Unit will remain in defrost for remainder of defrost cycle time or until defrost the
15. fer to Residential Split System Longline Application Guideline t Additional requirement for Low Ambient Controller full modulation feature MotorMaster Control Outdoor Unit Connected To Factory Approved Indoor Unit Outdoor unit contains correct system refrigerant charge for operation with approved ARI rated indoor unit when connected by 15 ft 4 57 m of field supplied or factory accessory tubing and factory supplied filter drier Check refrigerant charge for maximum efficiency Refrigerant Tubing and Sweat Connections Connect vapor tube to fitting on outdoor unit vapor service valves see Table 2 Connect liquid tubing to adapter tube on liquid service valve Use refrigerant grade tubing A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Service valves must be wrapped in a heat sinking material such as a wet cloth while brazing Remove plastic retainer holding outdoor piston in liquid service valve leaving the piston and piston retainer inside the valve Connect sweat flare adapter provided to valve See Fig 4 Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves Service valves are closed from factory and ready for brazing After wrapping service valve with a wet cloth tubing set can be brazed to service valve using either silver bearing or non silver bearing brazing material Do not use soft solder materials
16. frigerant grade tubing of correct size and condition For tubing requirements beyond 80 ft substantial capacity and performance losses can occur Following the recommendations in the Application Guideline and Service Manual Residential Split System Air Conditioners and Heat Pumps will reduce these losses Refer to Table 1 for accessory requirements Refer to Table 2 for field tubing diameters There are no buried line applications greater than 36 in 914 4 mm If refrigerant tubes or indoor coil are exposed to atmosphere they must be evacuated to 500 microns to eliminate contamination and moisture in the system 2 Table 1 Accessory Usage REQUIRED FOR LOW AMBIENT REQUIRED FOR REQUIRED FOR Accessory COOLING APPLICATIONS LONG LINE APPLICATIONS SEA COAST APPLICATIONS Below 55 F 12 8 C Over 80 ft 24 38 m Within 2 miles 3 22 km Accumulator Standard Standard Standard Ball Bearing Fan Motor Yest No No Compressor Start Assist Capacitor and Yes Yes No Relay Crankcase Heater Yes Yes No Evaporator Freeze Thermostat Yes No No Hard Shutoff TXV Yes Yes Yes Isolation Relay Yes No No Long Line Application Liquid Line Solenoid Valve No See Long e Ree No Guideline Motor Master Control or Ye N N Low Ambient Switch ii 7 Support Feet Recommended No Recommended For tubing line sets between 80 and 200 ft 24 38 and 60 96 m and or 20 ft 6 09 m vertical differential re
17. ing refrigerant piping and service Allow 24 in 609 6 mm clearance to service end of unit and 48 in 1219 2 mm above unit For proper airflow a 6 in 152 4 mm clearance on 1 side of unit and 12 in 304 8 mm on all remaining sides must be maintained Maintain a distance of 24 in 609 6 mm between units or 18 in 457 2 mm if no overhang within 12 ft 3 66 m Position so water snow or ice from roof or eaves cannot fall directly on unit NOTE 18 clearance option described above is approved for outdoor units with wire grille coil guard only Units with louver panels require 24 between units On rooftop applications locate unit at least 6 in above roof surface 3 8 in 9 53 mm Dia Tiedown Knockouts in Basepan 2 Places i Pi View From Top UNIT BASE PAN TIEDOWN KNOCKOUT LOCATIONS in mm Dimension A B Cc 26 X 26 9 1 8 231 8 4 7 16 112 7 21 1 4 539 8 31 1 2 X 31 1 2 9 1 8 231 8 6 9 16 166 7 24 11 16 627 1 35 X 35 9 1 8 231 8 6 9 16 166 7 28 7 16 722 3 A05177 Fig 2 Tiedown Knockout Locations Operating Ambient The minimum outdoor operating ambient in cooling mode without accessory is 55 F 12 78 C and the maximum outdoor operating ambient in cooling mode is 125 F 51 67 C The maximum outdoor operating ambient in hea
18. ion Do not overcharge system with refrigerant e Do not operate unit in a vacuum or at negative pressure e Do not disable low pressure switch in scroll compressor applications e Compressor dome temperatures may be hot Follow these steps to properly start up system 1 After system is evacuated fully open liquid and vapor service valves 2 Unit is shipped with valve stem s front seated closed and caps installed Replace stem caps after system is opened to refrigerant flow back seated Replace caps finger tight and tighten with wrench an additional 1 12 turn 3 Close electrical disconnects to energize system 4 Set room thermostat at desired temperature Be sure set point is below indoor ambient temperature 5 Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode as desired Operate unit for 15 minutes Check system refrigerant charge TYPICAL HEAT HP THERMOSTAT FAN COIL PUMP 24 VAC HOT 24 VAC COM HEAT STAGE 2 COOL HEAT STAGE 1 LEGEND 24 FACTORY WIRING 24y FIELD WIRING 5 FIELD SPLICE CONNECTION ery OUTDOOR THERMOSTAT EMERGENCY HEAT RELAY SHR SUPPLEMENTAL HEAT RELAY A02325 A97413 Fig 8 Generic Wiring Diagrams See Thermostat Installation Instructions for specific unit com binations Sequence of Operation Turn on power to indoor and outdoor units Transformer is energized Cooling On a call for cooling thermostat
19. ob Site Unpack Unit Move to final location Remove carton taking care not to damage unit Inspect Equipment File claim with shipping company prior to installation if shipment is damaged or incomplete Locate unit rating plate on unit corner panel It contains information needed to properly install unit Check rating plate to be sure unit matches job specifications Install on a Solid Level Mounting Pad If conditions or local codes require the unit be attached to pad tie down bolts should be used and fastened through knockouts provided in unit base pan Refer to unit mounting pattern in Fig 2 to determine base pan size and knockout hole location For hurricane tie downs contact distributor for details and PE Certification Professional Engineer if required On rooftop applications mount on level platform or frame Place unit above a load bearing wall and isolate unit and tubing set from structure Arrange supporting members to adequately support unit and minimize transmission of vibration to building Consult local codes governing rooftop applications Roof mounted units exposed to winds above 5 mph may require wind baffles Consult the Service Manual Residential Split System Air Conditioners and Heat Pumps for wind baffle construction NOTE Unit must be level to within 2 3 8 in ft per compressor manufacturer specifications Clearance Requirements When installing allow sufficient space for airflow clearance wir
20. rmostat reopens at approximately 65 F 18 33 C coil temperature of liquid line 8 Turn off power to outdoor unit and reconnect fan motor lead to OF2 on control board OUTDOOR FAN RELAY DEFROST THERMOSTAT MUST BE CLOSED BEFORE DEFROST TIMER BEGINS HK32EA001 T1 ENABLES DEFROST TIMER MUST BE ENERGIZED FOR DEFROST TIMER TO START C COMMON Y OUTPUT TO PRESSURE SWITCHES AND CONTACTOR O REVERSING VALVE r SPEEDUP THERMOSTAT INPUTS A05332 Fig 9 Defrost Control Table 3 Defrost Control Speedup Timing Sequence PARAMETER MINUTES MINUTES NOMINAL 30 minute cycle 27 33 7 sec 50 minute cycle 45 55 12 sec 90 minute cycle 81 99 21 sec 10 minute cycle 9 11 2 sec 5 minutes 4 5 5 5 1 sec Check Charge Factory charge amount and desired subcooling are shown on unit rating plate Charging method is shown on information plate inside unit To properly check or adjust charge conditions must be favorable for subcooling charging Favorable conditions exist when the outdoor temperature is between 70 F and 100 F 21 11 C and 37 78 C and the indoor temperature is between 70 F and 80 F 21 11 C and 26 67 C Follow the procedure below Unit is factory charged for 15ft 4 57 m of lineset Adjust charge by adding or removing 0 6 0z ft of 3 8 liquid line above
21. ting mode is 66 F 18 89 C Check Defrost Thermostat Check defrost thermostat to ensure it is properly located and securely attached There is a liquid header with a brass distributor and feeder tube going into outdoor coil At the end of the one of the feeder tubes there is a 3 8 in O D stub tube approximately 2 in long See Fig 3 The defrost thermostat should be located on stub tube Note that there is only one stub tube used with liquid header and on most units it is the bottom circuit FEEDER TUBE AU DEFROST THERMOSTAT A97517 Fig 3 Defrost Thermostat Location Make Piping Connections amp WARNING PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury or death Relieve pressure and recover all refrigerant before system repair or final unit disposal Use all service ports and open all flow control devices including solenoid valves A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation If ANY refrigerant tubing is buried provide a 6 in 152 4 mm vertical rise at service valve Refrigerant tubing lengths up to 36 in 914 4 mm may be buried without further special consideration Do not bury lines longer than 36 in 914 4 mm Outdoor units may be connected to indoor section using accessory tubing package or field supplied re
Download Pdf Manuals
Related Search