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Carrier WeatherMaster 48HC14, Installation Instructions Manual

The Carrier WeatherMaster 48HC14 is a high-performance HVAC unit designed to keep your space comfortable all year round. To ensure a seamless installation process, make sure to download the free Installation Instructions Manual from our website. This comprehensive manual provides detailed step-by-step guidance for easy setup and optimal performance.

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53480222-01

Printed in U.S.A.

Form 48HC-14-04SI

Pg 1 

2-19

Replaces: 48HC-14-03SI

Installation Instructions

CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow (cfm)  . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . 7

• ROOF MOUNT

Step 2 — Plan for Sequence of Unit Installation . . . . 7

• CURB-MOUNTED INSTALLATION

• PAD-MOUNTED INSTALLATION

• FRAME-MOUNTED INSTALLATION

Step 3 — Inspect Unit  . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . 8

• ROOF CURB MOUNT

• SLAB MOUNT (HORIZONTAL UNITS ONLY)

• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR 

SLAB MOUNT)

Step 5 — Field Fabricate Ductwork  . . . . . . . . . . . . . 10
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 10

• POSITIONING ON CURB

Step 7 — Convert to Horizontal and Connect 

Ductwork (When Required). . . . . . . . . . . . . . . . . . 11

Step 8 — Install Outside Air Hood  . . . . . . . . . . . . . . 12

• ECONOMIZER HOOD REMOVAL AND SETUP — 

FACTORY OPTION

• TWO POSITION DAMPER HOOD REMOVAL AND 

SETUP — FACTORY OPTION

• ECONOMIZER HOOD AND TWO-POSITION HOOD

Step 9 — Install Flue Hood  . . . . . . . . . . . . . . . . . . . . 14
Step 10 — Install Gas Piping. . . . . . . . . . . . . . . . . . . 14

• FACTORY OPTION THRU-BASE CONNECTIONS 

(GAS CONNECTION)

Step 11 — Install External Condensate Trap and

Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Step 12 — Make Electrical Connections  . . . . . . . . . 18

• FIELD POWER SUPPLY

• ALL UNITS

• UNITS WITHOUT FACTORY-INSTALLED NON-

FUSED DISCONNECT OR HACR CIRCUIT BREAKER

• UNITS WITH FACTORY-INSTALLED NON-FUSED 

DISCONNECT OR HACR CIRCUIT BREAKER

• CONVENIENCE OUTLETS

• HACR CIRCUIT BREAKER

• FACTORY OPTION THRU-BASE CONNECTIONS 

(ELECTRICAL CONNECTIONS)

• UNITS WITHOUT THRU-BASE CONNECTIONS

• FIELD CONTROL WIRING

• THERMOSTAT

• UNIT WITHOUT THRU-BASE CONNECTION KIT

• HEAT ANTICIPATOR SETTINGS

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Humidi-MiZer® System Control Connections  . . . . .28

• HUMIDI-MIZER — SPACE RH CONTROLLER

EconoMi$er® X (Factory Option)  . . . . . . . . . . . . . . .30

• SYSTEM COMPONENTS

• SPECIFICATIONS

• INPUTS

• OUTPUTS

• ENVIRONMENTAL

• ECONOMIZER MODULE WIRING DETAILS

• INTERFACE OVERVIEW

• SETUP AND CONFIGURATION

• ENTHALPY SETTINGS

• TWO-SPEED FAN OPERATION

• CHECKOUT

• TROUBLESHOOTING

Low Ambient Control (Factory Option). . . . . . . . . . .43
Staged Air Volume (SAV™) with Variable Frequency 

Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . .43

ComfortLink Controls (Factory Option) . . . . . . . . . .43
PremierLink™ Controller (Factory Option)  . . . . . . .47
RTU Open Controller System (Factory-Installed

Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

• ADDITIONAL APPLICATION DATA

Step 13 — Adjust Factory-Installed Options  . . . . . .48

• SMOKE DETECTORS

• ECONOMI$ER IV OCCUPANCY SWITCH

Step 14 — Install Accessories . . . . . . . . . . . . . . . . . .48
Step 15 — Check Belt Tension  . . . . . . . . . . . . . . . . .48

• BELT FORCE — DEFLECTION METHOD

• BELT TENSION METHOD

Pre-Start and Start-Up  . . . . . . . . . . . . . . . . . . . . . . . .49
START-UP CHECKLIST  . . . . . . . . . . . . . . . . . . . . .CL-1

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,

maintenance, or use can cause explosion, fire, electrical shock

or other conditions which may cause 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

48HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of
2018.
48HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor fan
control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable Frequency
Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and Troubleshooting manual.

WeatherMaster

®

48HC14

Single Package Rooftop Gas Heat/Electric Cooling

Unit with Puron

®

 (R-410A) Refrigerant

Summary of Contents for WeatherMaster 48HC14

Page 1: ...NTROLLER EconoMi er X Factory Option 30 SYSTEM COMPONENTS SPECIFICATIONS INPUTS OUTPUTS ENVIRONMENTAL ECONOMIZER MODULE WIRING DETAILS INTERFACE OVERVIEW SETUP AND CONFIGURATION ENTHALPY SETTINGS TWO SPEED FAN OPERATION CHECKOUT TROUBLESHOOTING Low Ambient Control Factory Option 43 Staged Air Volume SAV with Variable Frequency Drive Factory Option 43 ComfortLink Controls Factory Option 43 PremierL...

Page 2: ...o unit and install lock s and lockout tag s Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate Unit may have more than one power switch WARNING UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could cause personal injury death and or equipment damage Puron R 410A refrigerant systems operate at higher pres sures than standard R ...

Page 3: ...let pressure tap set screw must be tightened and 1 8 in NPT pipe plug must be installed to prevent gas leaks GAS VALVE INLET PRESSURE TAP SET SCREW WARNING FIRE HAZARD Failure to follow this warning could result in personal inju ry death and or property damage Manifold pressure tap set screw must be tightened and 1 8 in NPT pipe plug must be installed to prevent gas leaks Table 1 Rated Indoor Airf...

Page 4: ... W7212 EconoMi er IV Non Fault Detection and Diagnostic 1 PremierLink Controller 2 RTU Open Multi Protocol Controller 6 Electro mechanical w 2 speed fan and W7220 Econo controller Controls Can be used with W7220 EconoMi er X with Fault Detection and Diagnostic D ComfortLink Controls Intake Exhaust Options A None B Temperature Economizer w Barometric Relief F Enthalpy Economizer w Barometric Relief...

Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit ...

Page 6: ...6 Fig 2 Unit Dimensional Drawing 14 Size Unit cont ...

Page 7: ...his unit will dictate different se quences for the steps of unit installation For example on curb mounted units some accessories must be installed on the unit before the unit is placed on the curb Review the following for recommended sequences for installation steps CURB MOUNTED INSTALLATION 1 Install curb 2 Install field fabricated ductwork inside curb 3 Install accessory thru base service connec...

Page 8: ...ply provided On units with hinged panel option check to be sure all latches are snug and in closed position Locate the carton containing the outside air hood parts see Fig 13 and 14 Do not remove carton until unit has been rigged and located in final position Step 4 Provide Unit Support ROOF CURB MOUNT Accessory roof curb details and dimensions are shown in Fig 4 Assemble and install accessory roo...

Page 9: ...9 Fig 4 Roof Curb Details ...

Page 10: ...on a vertical unit the return should be ducted through the roof deck to comply with applicable fire codes Step 6 Rig and Place Unit When the unit is ready to be rigged and no longer will be lifted by a fork truck the wood protector under the basepan must be removed Remove 4 screws from each base rail Wood protec tor will drop to the ground See instructions on the unit base rails Keep unit upright ...

Page 11: ...g to occur at this time tape or otherwise cover the fittings so that moisture does not get into the building or conduit in the interim Step 7 Convert to Horizontal and Connect Ductwork When Required Unit is shipped in the vertical duct configuration Unit without factory installed economizer or return air smoke detector op tion may be field converted to horizontal ducted configuration To convert to...

Page 12: ...r obscure visibility to the unit s informative data plate when insulating horizontal ductwork Fig 9 Horizontal Conversion Panels Fig 10 Location of Notches Fig 11 Horizontal Duct Panels In Place Step 8 Install Outside Air Hood ECONOMIZER HOOD REMOVAL AND SETUP FAC TORY OPTION 1 The hood is shipped in knock down form and located in the return air compartment It is attached to the econo mizer using ...

Page 13: ...r coil access panel will be used as the top of the hood If the panel is still attached to the unit remove the screws along the sides and bottom of the panel See Fig 15 2 Swing out indoor coil access panel and insert the hood sides under the panel hood top Be careful not to lift the panel too far as it might fall out Use the screws provided to attach the hood sides to the hood top Use screws pro vi...

Page 14: ...ea level In Canada the input rating must be derated by 10 for altitudes of 2000 ft 610 m to 4500 ft 1372 m above sea level For natural gas applications gas pressure at unit gas connec tion must not be less than 5 in wg 1250 Pa or greater than 13 in wg 3240 Pa while the unit is operating see Tables 3 and 4 For liquified petroleum LP applications the gas pres sure must not be less than 11 in wg 2740...

Page 15: ... L bracket and the connector plate assembly NOTE Take care not to damage the gasket as it is reused in the following step 4 Place the gasket over the embossed area in the basepan aligning the holes in the gasket to the holes in the basepan See Fig 21 5 Install the connector plate assembly to the basepan using 8 of the washer head screws NOTE If gas and or electrical connections are not going to oc...

Page 16: ...cated a minimum of 4 ft 1220 mm away from the unit s flue outlet Some municipal codes require that the manual shutoff valve be located upstream of the sediment trap See Fig 23 and 24 for typical piping arrangements for gas piping that has been routed through the sidewall of the curb See Fig 25 for typical piping arrangement when thru base is used Ensure that all piping does not block access to the...

Page 17: ...tions NOTE If orifice hole appears damaged or it is suspected to have been re drilled check orifice hole with a numbered drill bit of cor rect size Never re drill an orifice A burr free and squarely aligned orifice hole is essential for proper flame characteristics See Fig 26 Fig 26 Orifice Hole Step 11 Install External Condensate Trap and Line The unit has one 3 4 in condensate drain connection o...

Page 18: ...ect directly to the end panel see Fig 32 In either case set the disconnect vertical location on the unit so that a 90 degree fitting can be used to connect the conduit to the disconnect Fig 29 Conduit into Factory Option Non Fused Disconnect or HACR Fig 30 Conduit into Control Box Fig 31 Mounting Position for Field Disconnects over 100A WARNING Failure to follow this warning could result in person...

Page 19: ...compressor terminals during operation must be within voltage range indicated on unit nameplate On 3 phase units voltages between phases must be balanced within 2 and the current within 10 Use the formula below to deter mine the percent of voltage imbalance Voltage Imbalance Example Supply voltage is 230 3 60 Determine maximum deviation from average voltage AB 227 224 3 v BC 231 227 4 v AC 227 226 ...

Page 20: ...oor motor and options Fig 35 Location of Non Fused Disconnect Enclosure To field install the NFD shaft and handle 1 Remove the unit front panel see Fig 2 2 Remove 3 hex screws on the NFD enclosure 2 on the face of the cover and 1 on the bottom 3 Remove the front cover of the NFD enclosure 4 Make sure the NFD shipped from the factory is at OFF position the arrow on the black handle knob is at OFF 5...

Page 21: ...circuit breaker enclosure 11 Re install the unit front panel Fig 38 Handle and Shaft Assembly for HACR Circuit Breaker CONVENIENCE OUTLETS Two types of convenience outlets are offered on 48HC 14 models non powered and unit powered Both types provide a 125 v GFCI ground fault circuit interrupter duplex recepta cle rated at 15 A behind a hinged waterproof access cover lo cated on the panel beneath t...

Page 22: ... For the load side wiring to the factory option disconnect route the wires through the hole on the right side of the disconnect Be sure to create a drip loop at least 6 in long Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle Check for proper grounding wires and power line phasing if the GFCI re ceptacle does not trip as required Pr...

Page 23: ...el on factory installed HACR for the amp rating of the HACR that was shipped with the unit from the factory See unit nameplates for the proper fuse HACR or maximum over current protection device required on the unit with field installed accessories Fig 43 HACR Caution Label FACTORY OPTION THRU BASE CONNECTIONS ELEC TRICAL CONNECTIONS This service connection kit consists of a 1 2 in electrical bulk...

Page 24: ...ble or equivalent with minimum of six leads Check the thermostat installation instructions for additional features which might require additional conductors in the cable For wire runs up to 50 ft 15 m use no 18 AWG American Wire Gage insulated wire 35 C 95 F minimum For 50 to 75 ft 15 to 23 m use no 16 AWG insulated wire 35 C 95 F minimum For over 75 ft 23 m use no 14 AWG insu lated wire 35 C 95 F...

Page 25: ...25 Fig 48 48HC 14 Controls Wiring Diagram 208 230 v 460 v 575 v ...

Page 26: ...26 Fig 49 48HC 14 Power Wiring Diagram 208 230 v 460 v ...

Page 27: ...27 Fig 50 48HC 14 Power Wiring Diagram 575 v ...

Page 28: ...d the wire tie to reduce any slack in the humidistat cable to ensure that it will not be damaged by contact with the condenser coil see Fig 47 5 Use wire nuts to connect humidistat cable to two PINK leads in the low voltage wiring as shown in Fig 53 To connect the Thermidistat device 33CS2PPRH 01 1 Route the Thermidistat multi conductor thermostat cable field supplied through the bushing in the un...

Page 29: ...29 Fig 53 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...

Page 30: ...ensors Economizer Module The module is the core of the EconoMi er X system The module is mounted in the unit s control box and includes the user interface for the system The W7220 economizer module provides the basic inputs and outputs to provide simple economizer control When used with the optional sensors the economizer module provides more advanced economizer functionality S Bus Enthalpy Contro...

Page 31: ...ators Exhaust fan Y1 Y2 and AUX1 O All Relay Outputs at 30 vac Running 1 5A maximum Inrush 7 5A maximum ENVIRONMENTAL Operating Temperature 40 F to 150 F 40 C to 65 C Exception of display operation down to 4 F 20 C with full recovery at 4 F 20 C from exposure to 40 F 40 C Storage Temperature 40 F to 150 F 40 C to 65 C Shipping Temperature 40 F to 150 F 40 C to 65 C Relative Humidity 5 to 95 RH non...

Page 32: ...d on the front of the economizer controller Keypad Use the four navigation buttons see Fig 59 to scroll through the menus and menu items select menu items and to change parameter and configuration settings Table 9 Economizer Module Right Hand Terminal Blocks LABEL TYPE DESCRIPTION Top Right Terminal Blocks AUX2 I 24 vac IN The first terminal is not used OCC 24 vac IN Shut Down SD or HEAT W Convent...

Page 33: ...unit application has the control sensor locat ed after the cooling coil in the fan section where it is designated as Cooling Supply Air Temperature or SAT sensor SETUP AND CONFIGURATION Before being placed into service the W7220 Economizer mod ule must be set up and configured for the installed system The setup process uses a hierarchical menu structure that is easy to use Press the and arrow butt...

Page 34: ... invalid value if not connected short or out of range IN CO2 _ _ _ ppm 0 to 2000 ppm SPACE RETURN AIR CO2 Displays value of measured CO2 from CO2 sensor Invalid if not connected short or out of range May be adjusted in Advanced menu by Zero offset and Span DCV STATUS N A ON OFF DEMAND CONTROLLED VENTILATION STATUS Displays ON if above set point and OFF if below set point and ONLY if a CO2 sensor i...

Page 35: ...0 to 9990 cfm increment by 10 If OA MA RA and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode the OA dampers are controlled by CFM and displays from 100 to 9990 CFM 2 to 10 vdc With 2 speed fan units VENTMAX L low speed fan and VENTMAX H high speed fan settings are required Default for VENTMAX L is 3 2V and VENTMAX H is 2 8V VENTMIN 2 25 V 2 to 10 vdc or 100 to 9990 cfm increment ...

Page 36: ...ppm level to match CO2 sensor start level CO2 SPAN 2000ppm 1000 to 3000 ppm Increment by 50 CO2 ppm span to match CO2 sensor e g 500 1500 sensor output would be 500 CO2 zero and 1000 CO2 span STG3 DLY 2 0h 0 min 5 min 15 min then 15 min intervals Up to 4 hrs or OFF COOLING STAGE 3 DELAY Delay after stage 2 cool has been active Turns on second stage of cooling when economizer is first stage call an...

Page 37: ...AIR S BUS SENSOR ERROR Outdoor air enthalpy sensor has failed or become disconnected check wiring then replace sensor if the alarm continues OA SYLK H ERR N A N A RA SYLK T ERR N A N A RETURN AIR S BUS SENSOR ERROR Return air enthalpy sensor has failed or become disconnected check wiring then replace sensor if the alarm continues RA SYLK H ERR N A N A DA SYLK T ERR N A N A DISCHARGE AIR S BUS SENS...

Page 38: ...d ings see Table 13 For dry bulb operation with a 1 speed fan with or without DCV see Tables 14 and 15 For enthalpy operation with a 1 speed fan with or without DCV see Tables 16 and17 For dry bulb operation with a 2 speed indoor fan with or without DCV see Tables 18 and 19 For enthalpy operation with a 2 speed indoor fan with or without DCV see Tables 20 and 21 With stage 3 delay STG3 DLY in Adva...

Page 39: ...igh 24 v On 24 v On VENTMIN to VENTMAX Closed Yes Off Off High 0 v Off 0 v Off VENTMIN to VENTMAX Closed On Off High 0 v Off 0 v Off VENTMIN to Full Open Closed to Full Open On On High 24 v On 0 v Off VENTMIN to Full Open Closed to Full Open Table 16 Enthalpy Operation without DCV CO2 Sensor 1 Speed Fan DEMAND CONTROLLED VENTILATION DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O Y2 O O...

Page 40: ...ED UNOCCUPIED NONE No Off Off Low 0 v Off 0 v Off MIN POS L Closed On Off Low 24 v On 0 v Off MIN POS L Closed On On High 24 v On 24 v On MIN POS H Closed NONE Yes Off Off Low 0 v Off 0 v Off MIN POS L Closed On Off Low 0 v Off 0 v Off MIN POS L to Full Open Closed to Full Open On On High DELAY 24 v On 0 v Off MIN POS H to Full Open Closed to Full Open Table 19 Dry Bulb Operation with DCV CO2 Sens...

Page 41: ...tatus to determine the speed of the supply fan and controls the OA damper to the required posi tion see Table 22 The W heating mode is not controlled by the W7220 but it re quires the status to know where to position the OA damper for minimum position for the fan speed The 2 fan delay is available when the system is programmed for 2 speed fan in the System Setup menu item The 2 speed fan de lay is...

Page 42: ...ears 3 Press the Enter button to start the test The unit pauses and then displays IN PROGRESS When the test is complete DONE appears 4 When all desired parameters have been tested press the Menu Up button to end the test The Checkout tests can all be performed at the time of installa tion or at any time during the operation of the system as a test that the system is operable TROUBLESHOOTING Alarms...

Page 43: ...ing and configure for the specific job requirements Staged Air Volume SAV with Variable Fre quency Drive Factory Option For details on operating 48HC 2 stage cooling units equipped with the factory installed Staged Air Volume option refer to the Variable Frequency Drive VFD Installation Setup and Troubleshooting Supplement ComfortLink Controls Factory Option For details on operating 48HC units equ...

Page 44: ...44 Fig 62 48HC14 ComfortLink Control Wiring Diagram ...

Page 45: ...45 Fig 63 48HC14 ComfortLink Power Wiring Diagram ...

Page 46: ...46 Fig 64 48HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...

Page 47: ...wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements Units equipped with factory optional return air smoke detec tors require a relocation of the sensor module at unit installa tion See Fig 65 for the as shipped location Completing installation of return air smoke sensor 1 Unscrew the two screws holding t...

Page 48: ... Outdoor coil protector grille Head pressure control Programmable setback thermostat Electrical Mechanical thermostat and subbase Thermidistat device Humidistat Thermostat Sensors CO2 sensor DDC interface PremierLink controller Louvered hail guard Phase monitor control Refer to separate installation instructions for information on in stalling these accessories Step 15 Check Belt Tension Measure th...

Page 49: ...to the unit s Service Manual for detailed Pre Start and Start Up instructions Download the latest versions from HVAC Part ners www hvacpartners com Table 1 Table 2 BELT CROSS SECTION SMALLEST SHEAVE DIAMETER BELT DEFLECTION FORCE LBS UNNOTCHED BELTS NOTCHED BELTS USED NEW USED NEW A AX 3 0 3 6 3 7 5 5 4 1 6 1 3 8 4 8 4 5 6 8 5 0 7 4 5 0 7 0 5 4 8 0 5 7 8 4 B BX 3 4 4 2 4 9 7 2 4 4 5 6 5 3 7 9 7 1 ...

Page 50: ...t to discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 04 53480222 01 Printed in U S A Form 48HC 14 04SI Pg 50 2 19 Replaces 48HC 14 03SI Carrier Corporation 2019 ...

Page 51: ...ING IN THE CORRECT DIRECTION VERIFY INSTALLATION OF THERMOSTAT VERIFY THAT CRANKCASE HEATERS HAVE BEEN ENERGIZED FOR AT LEAST 24 HOURS II START UP ELECTRICAL TEMPERATURES PRESSURES VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS NOTE To avoid injury to personnel and damage to equipment or prop erty when completing the procedures listed in this start up checklist use good judgment follow safe pract...

Page 52: ...RECT ROTATION FOR COMPRESSOR F CHECK FOR CORRECT RAMP UP OF OUTDOOR FAN MOTOR AS CONDENSER COIL WARMS 4 CHECK UNIT CHARGE PER CHARGING CHART 5 SWITCH UNIT TO HIGH LATENT MODE SUBCOOLER BY CLOSING HUMIDISTAT WITH Y1 CLOSED OBSERVE A REDUCTION IN SUCTION PRESSURE 5 TO 7 PSI EXPECTED B DISCHARGE PRESSURE UNCHANGED C LIQUID TEMPERATURE DROPS TO 50 TO 55 F RANGE D LIQUID SOLENOID VALVE LSV ENERGIZED VA...

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