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508133-01

Page 19 of 25

Issue 2140

Unit Operation

4HP18V Unit Operation with a Conventional 

24VAC Non-Communicating 2-Stage Thermostat

When the 4HP18V unit is installed with a conventional 

24VAC non-communicating 2-stage thermostat, a Y1 first 

stage heating or cooling demand will initiate heating or 

cooling operation and first stage indoor blower operation. 

The compressor will be controlled in the variable capacity 

mode by varying the compressor capacity to obtain the 

target suction pressure set point. The Y2 second stage 

heating or cooling demand will initiate second stage blower 

operation. Increased air volume will increase the load on 

the indoor coil and increase the suction pressure. The 

4HP18V compressor capacity will continue to be controlled 

based upon the suction pressure. The unit capacity will be 

controlled in the variable capacity mode throughout the 

range of capacity from minimum capacity to maximum 

capacity. If the Y2 demand remains after 20 minutes, the 

4HP18V control will begin to ramp up the compressor 

capacity until maximum capacity is achieved. The 4HP18V 

unit will cycle off once the thermostat demand is satisfied.

4HP18V Unit Operation with a Conventional 

24VAC Non-Communicating Single-Stage 

Thermostat

When the 4HP18V unit is installed with a conventional 

24VAC non-communicating single-stage thermostat, 

a  Y1  first  stage  heating  or  cooling  demand  will  initiate 

heating or cooling operation and heating or cooling indoor 

blower operation. In single stage thermostat applications, 

a jumper must be installed between Y1 and Y2 on the 

4HP18V outdoor control. The compressor will be controlled 

in the variable capacity mode by varying the compressor 

capacity to obtain the target suction pressure set point. If 

the heating or cooling demand remains after 20 minutes, 

the 4HP18V control will begin to ramp up the compressor 

capacity until maximum capacity is achieved. The 4HP18V 

unit will cycle off once the thermostat demand is satisfied.

Heating Operation Mode Jumper

The Heating Operation Mode Jumper is only used on 

applications installed with a conventional 24VAC non-

communicating heat pump thermostat. In applications 

with a conventional 24VAC non-communicating heat 

pump thermostat, the compressor capacity is controlled to 

maintain the target liquid pressure setpoint. The Heating 

Operation Mode Jumper has two selectable heating 

modes.  The  two  modes  are  Efficiency  (Jumper  installed 

on Pins 1 & 2) and Comfort Mode (Jumper Removed). 

The  factory  default  position  is  the  Efficiency  Mode.  The 

Efficiency  mode  has  a  variable  liquid  pressure  setpoint 

that will vary with the outdoor temperature; as the outdoor 

temperature decreases, the liquid pressure setpoint will 

increase. When the Operation Mode jumper is installed 

in the “Comfort Mode” the liquid pressure setpoint is 425 

psig.

Operation Mode 

Jumper

Jumper 

Position

Target Liquid Pressure 

Setting

Efficiency (default)

Pin 4 to Pin 5

Variable based on OAT

Comfort

Jumper Off

425 PSIG

Table 10. Heating Operation Mode Jumper 

(Conventional 24VAC Thermostats Only)

Figure 12. Operation Mode Jumper

Содержание 4HP18V

Страница 1: ...trical components Only trained and qualified service personnel should install or service this equipment Installation and service performed by unqualified persons can result in property damage personal injury or death WARNING Sharp metal edges can cause injury When installing the unit use care to avoid sharp edges WARNING ELECTRICAL SHOCK HAZARD Risk of electrical shock Disconnect all remote power ...

Страница 2: ...fety codes Wear safety glasses and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warning or cautions attached to the unit 1 Always wear proper personal protection equipment 2 Always disconnect electrical power before removing panel or servicing equipment 3 Keep hands and clothing away from moving parts 4 Ha...

Страница 3: ...lding not to exceed 1 4 per foot Figure 1 Slab Mounting Install on a Solid Level Mounting Pad The outdoor section is to be installed on a solid foundation This foundation should extend a minimum of 2 inches beyond the sides of the outdoor section To reduce the possibility of noise transmission the foundation slab should NOT be in contact with or be an integral part of the building foundation See F...

Страница 4: ...nty will be void if the drier is not installed Installation of Line Sets DO NOT fasten liquid or suction lines in direct contact with the floor or ceiling joist Use an insulated or suspension type of hanger Keep both lines separate and always insulate the suction line Liquid line runs 30 feet or more in an attic will require insulation Route refrigeration line sets to minimize length DO NOT let re...

Страница 5: ...ed in Table 3 Between 51 and 150 Linear Feet Crankcase heater and nonbleed port TXV factory installed No additional components required Vertical vapor riser must be sized to the vapor riser listed in the Table 4 on systems with line sets longer than 51 feet Use Table 4 and Table 5 to determine the correct liquid and vapor line sizes Over 150 Linear Feet not recommended Additional oil is not requir...

Страница 6: ... line size shaded row on the outdoor tonnage C Select the actual Total Linear Length of your system shown at the top of the table D The elevation listed in the table is the maximum allowed for the liquid line listed E Select or consider the larger liquid line size shown in the table if the elevation does not meet your requirements Table 5 Liquid Line Diameter Selection Typical Existing Fixed Orifi...

Страница 7: ...nts including line set and indoor coil must be an AHRI match with the unit in order to fulfill unit warranty requirements Fire Explosion and Personal Safety hazard Failure to follow this warning could result in damage personal injury or death Never use oxygen to pressurize or purge refrigeration lines Oxygen when exposed to a spark or open flame can cause fire and or an explosion that could result...

Страница 8: ...ulb insulation is required if mounted external to the coil casing sensing bulb installation for bulb positioning STUB END TEFLON RING LIQUID LINE ASSEMBLY WITH BRASS NUT DISTRIBUTOR ASSEMBLY 3 Install one of the provided Teflon rings around the stubbed end of the check expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil 4 Attach th...

Страница 9: ...round Do not crimp end of the line Remove service cap and core from both the vapor and liquid line service ports 1 2 LIQUID LINE SERVICE VALVE SERVICE PORT CORE SERVICE PORT CAP SERVICE PORT CORE SERVICE PORT CAP CUT AND DEBUR LINE SET SIZE MATCHES SERVICE VALVE CONNECTION DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION 3 VAPOR LINE SERVICE VALVE COPPER TUBE STUB REFRIGER...

Страница 10: ...VES POINT FLAME AWAY FROM SERVICE VALVE PREPARATION FOR NEXT STEP 7 WRAP SERVICE VALVES To help protect service valve seals during brazing wrap water saturated cloths around service valve bodies and copper tube stubs Use additionalwater saturated cloths underneath the valve body to protect the base paint 4 FLOW NITROGEN Flow regulated nitrogen at 1 to 2 psig through the refrigeration gauge set int...

Страница 11: ... of the manifold gauge set in order to pressurize the line set and the indoor unit E After a few minutes open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector F After the line set has been connected to the indoor and outdoor units check the line set connections and indoor unit for leaks Use the following procedure to test...

Страница 12: ...uid refrigerant Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit G Perform the following Close manifold gauge valves Shut off HFC 410A cylinder Reinstall service valve cores by removing manifold hose from service valve Quickly install cores with core tool while maintaining a positive system pressure Replace stem caps and finger tighten them t...

Страница 13: ... the outdoor unit R C W1 O and Y1 and Y1 is jumpered to Y2 in the outdoor unit Note that the published performance data is based upon the use of a two stage thermostat Refer to the 4HP18V field wiring diagram for a conventional 24VAC non communicating single stage thermostat 4HP18V Low Voltage Control Wiring Connections The 4HP18V variable capacity units are provided with 2 RAST 6 Pin connections ...

Страница 14: ...ressure Figure 9 Table 6 4HP18V Thermostat Control Options Size Circuit and Install Service Disconnect Switch Refer to the unit nameplate for minimum circuit ampacity and maximum fuse or circuit breaker HACR per NEC Install power wiring and properly sized disconnect switch SERVICE DISCONNECT SWITCH MAIN FUSE BOX BREAKER PANEL Figure 6 NOTE Units are approved for use only with copper conductors Gro...

Страница 15: ...emperature Rating 35 C Minimum More than 100 30m 16 Table 7 Conventional 24VAC Non Communicating Thermostat Wiring Route High Voltage and Ground Wires Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring To facilitate a conduit a cutout is located on the bottom of the control box Connect conduit to the control box using a proper conduit fitting ...

Страница 16: ... C W1 R G TC TO ACC2 ACC1 Y1 O DH C W2 W1 R G DS W2 O D SENSOR OPTIONAL FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT TERMINAL STRIP Figure 9 Conventional 24VAC Cooling Non Communicating Thermostat Wiring Single Stage RAST 6 PIN CONNECTOR RAST 6 PIN CONNECTOR VARIABLE CAPACITY OUTDOOR UNIT TWO STAGE VARIABLE SPEED GAS FURNACE CONVENTIONAL 24VAC NON COMMUNICATING ...

Страница 17: ...he intended capacity for the application is 3 or 5 Ton skip this section The units are field convertible to 2 Ton or 4 Ton to efficiently perform for the required application If the intended capacity is 2 or 4 Ton proceed to the following steps to program the unit type Outdoor unit must be powered ON and in idle mode no heating or cooling mode of operation NOTE The 36 unit can be programmed to ope...

Страница 18: ...initiate the Charge Mode A heating blower demand must also be provided to initiate high speed blower operation on the indoor unit The compressor and outdoor fan motor will begin to ramp up and reach 100 design capacity within 3 minutes They will continue to operate at 100 design capacity for the duration of charge mode Exiting Charge Mode To exit the charging mode remove the Charge Mode Jumper fro...

Страница 19: ...eating or cooling indoor blower operation In single stage thermostat applications a jumper must be installed between Y1 and Y2 on the 4HP18V outdoor control The compressor will be controlled in the variable capacity mode by varying the compressor capacity to obtain the target suction pressure set point If the heating or cooling demand remains after 20 minutes the 4HP18V control will begin to ramp ...

Страница 20: ... to list the actual field charge Table 11 Refrigerant Charge Adjustment Liquid Line Set Diameter Oz Per 5 ft adjust from 15 ft line set 3 8 in 3 oz per 5 ft or 0 6 oz per 1 ft If line length is greater than 15 ft add this amount If line length is less than 15 ft remove this amount Mineral oils are not compatible with R 410A If oil must be added it must be a polyolester oil IMPORTANT NOTE Both airf...

Страница 21: ...ng is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Liquid or Suction Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Use service wrench with a hex head extension to back the stem out counterclockwise as far as it will go Use a 3 16 hex head extension for liquid line service valves and a 5 16 extension for suction line service valves 3...

Страница 22: ...mild detergent and rinsing with cold water Allow filter to dry before reinstalling Replace filters with the arrows pointing in the direction of airflow Dirty filters are the most common cause of poor heating cooling performance and compressor failures Indoor Coil If the system has been operated with a clean filter in place it should require minimal cleaning If cleaning is needed call your dealer f...

Страница 23: ... pump to automatically switch from heating mode to cooling mode to maintain predetermined comfort settings Many heat pump thermostats are also equipped with an emergency heat mode which locks out heat pump operation and provides temporary heat supplied by the auxiliary heat Indicating Light Most heat pump thermostats have an amber light which indicates when the heat pump is operating in the emerge...

Страница 24: ...Page 24 of 25 508133 01 Issue 2140 Figure 15 Wiring Diagram ...

Страница 25: ...________ Actual Amps ______ Rated Volts _______ Actual Volts ________ Condenser Fan Full Load Amps _________ Actual Amps ______ Cooling Mode Suction Pressure ____________________ Liquid Pressure _________ Supply Air Temperature _______________ Ambient Temperature ___________ Return Air Temperature _________ System Refrigerant Charge Refer to manufacturer s information on unit or installation instr...

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