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8

rEFrIGErant charGInG & unIt start uP

 WarnInG:

ElEctrIcal shocK or FIrE hazarD

Failure to follow safety warnings exactly could result 

in serious injury or property damage.
Improper servicing could result in dangerous 

operation, serious injury, death or property damage.
•  Before servicing, disconnect all electrical power 

to the unit.

•  When  servicing  controls,  label  all  wires  prior  to 

disconnecting. reconnect wires correctly.

•  Verify proper operation after servicing.

 WarnInG:

the geothermal heat pump leaves the factory with 

a nitrogen holding charge. Follow all charging 

instructions for maximum unit performance and 

efficiency. only charge the unit with the refrigerant 

listed on the unit rating plate. some local codes 

require licensed installation/service personnel to 

service this type of equipment. refrigerant charging 

must be done by qualified personnel familiar with 

safe and environmentally responsible refrigerant 

handling procedures. under no circumstances 

should the owner attempt to install and/or service 

this equipment. Failure to comply with this warning 

could result in property damage, personal injury, or 

death.

 cautIon:

this unit uses r-410a refrigerant. Do not use 

any other refrigerant in this unit. use of another 

refrigerant may damage the unit.

 cautIon:

this unit uses r-410a refrigerant with PoE oil. When 

servicing, cover or seal openings to minimize the 

exposure of the refrigerant system to air to prevent 

accumulation of moisture and other contaminants.

•  After refrigerant line connections are completed, it is required 

that you leak check and evacuate the indoor section and all 
line connections (using proper methods) before finalizing 
the full system refrigerant charge. For final charges based 
on matched systems and specified line lengths, see 

Table 

4, (page 9)

.

•  Pressure test the entire system at 400 psig with dry nitrogen 

prior to pulling a vacuum and charging.

•  Prior to charging the system with refrigerant, make sure 

that a vacuum pump has been used to fully evacuate the 
system to at least 250 microns.

table 3. thermostat Wire Gauge

thErMostat

WIrE GauGE

MaXIMuM rEcoMMEnDED

 thErMostat WIrE lEnGth (Ft)

24

25

22

45

20

70

18

110

•  Where local codes require that the thermostat wiring must 

be routed through a conduit or raceway, splices can be 

made inside the unit; however, all wiring must be NEC 

Class 1 and must be separated from incoming power leads. 

Recommended low voltage wire gauges and wire lengths 

are listed in 

Table 3

.

•  The thermostat should be mounted about 5 feet above the 

floor on an inside wall. DO NOT install the thermostat on 

an outside wall or any other location where its operation 

may be adversely affected by radiant heat from fireplaces, 

sunlight, or lighting fixtures, and convective heat from warm 

air registers or electrical appliances. Refer to the thermostat 

manufacturer’s instruction sheet for detailed mounting and 

installation information.

compressor Electrical

 WarnInG:

turn the compressor unit oFF during installation 

or servicing. also turn oFF supplemental (backup) 

heater power and/or fuel supply source (if applicable). 

Failure to follow this safety warning exactly could 

result in serious personal injury or death.

Summary of Contents for Y1SA

Page 1: ...ty warnings and any other special notes highlighted in the manual Improper installation of this unit or failure to follow safety warnings could result in serious injury death or property damage Theseinstructionsareprimarilyintendedtoassistqualifiedindividualsexperiencedintheproper installation of this appliance Some local codes require licensed installation service personnel for this type of equip...

Page 2: ...R 410A Charging Procedure 10 Initial Charge 10 Starting In Heating Mode Charging To Sight Glass 10 System Check 11 Air Circulation Indoor Blower 11 System Heating 11 OperatinG Sequence 11 Cooling 11 Heating 11 Unit MAINTENANCE 12 Filter Drier 12 Replacing the Oil Separator Filter 12 Adding Compressor Oil 12 Troubleshooting 13 Two Digit Display 13 Loss Of Capacity 14 Restricted Refrigerant System 1...

Page 3: ...akeitnecessaryfor evacuationandcharging itshouldonlybeattempted by qualified trained personnel thoroughly familiar with this equipment Some local codes require licensed installation service personnel to service this type of equipment Under no circumstances should the equipment owner attempt to install and or service this equipment Failure to comply with this warning could result in equipment damag...

Page 4: ...d requirement Load estimates can be made using approved methods available from Air Conditioning Contractors of America ManualJ AmericanSocietyofHeating Refrigerating and Air Conditioning Engineers or other approved engineering methods Thisunitisdesignedforindoorandoutdoorinstallationsand shouldbelocatedwithconsiderationgiventotheaccessibility of fuel electric power service access noise shade and d...

Page 5: ...sor section is equipped with components and control logics described in the following sections Heating To Cooling Transition The compressor section includes a hot gas injection valve to ensure smooth transition from heating to cooling mode operations See Figure 6 page 16 After heating mode operation the earth loop temperature maybebelowthenormalundergroundtemperature around 58 F As the refrigerant...

Page 6: ...ler Insulating Interior Line Sets Insulate all interior refrigerant lines and their connections The compressor section contains the expansion valve and the liquid line is more likely to sweat as it condenses moisture from the interior air Use at least a 3 4 inch wall closed cell insulation that is non corrosive to copper to insulate all refrigerant lines Use Armaflex Neoprene or Rubatex having at ...

Page 7: ...rature rather than operating on a preferred temperature maintain mode If the system has electric strip heat back up within the air handler the system can operate together with the electric supplement heat as the strip heating coils are installed downstream of the refrigerant heat exchanger The electric strip heat is supplemental to the heat provided by the geothermal system The thermostat used wit...

Page 8: ...efrigerantlineconnectionsarecompleted itisrequired that you leak check and evacuate the indoor section and all line connections using proper methods before finalizing the full system refrigerant charge For final charges based on matched systems and specified line lengths see Table 4 page 9 Pressure test the entire system at 400 psig with dry nitrogen prior to pulling a vacuum and charging Prior to...

Page 9: ...n by using the following formula TROV ft 3 Total refrigerant charge lb x 40 The examples below were calculated assuming 25 single line length between well and compressor sections L1 and 6 single line length between compressor section and air handler L2 For the 2 ton example the well length is 200 ft and for the 5 ton example the well length is 400 ft as shown in Table 4 Theinstalledsystemiswithane...

Page 10: ...g the compressor to draw high watts Too little refrigerant will freeze the indoor coil in cooling mode operation The recommended charging method is to charge refrigerant to the middle of the sight glass of the accumulator during heating operation In cooling mode with correct R 410A charge the refrigerant returning from the well is in a saturated condition The conventional method of charging by sub...

Page 11: ...rt e If the system has run in the previous 5 minutes a 5 minute anti short cycle timer must expire before the system will restart 3 If the above conditions are met the compressor will start and the reversing valve shift into position if not already in the cooling position a At any time during compressor operation the system will stop if The discharge pressure exceeds 635 psig The suction pressure ...

Page 12: ...lter which is installed at the factory The second filter is to be used as a replacement within 24 to 48 hours of operation These coalescent filters will pick up all dirt and particulates down to 0 3 microns Typical filter driers only catch 50 microns or larger Frequently check the pressure drop across the separator on new installations See Figure 2 and Table 5 page 10 Changethefilterafteraninitial...

Page 13: ...e numbers represent the firmware version When the unit is ready to run it will display which indicates that the unit is in standby mode The display will alternate between the current status and any current or recent events See Table 7 page 14 for status and event codes The display alternates between showing the current status code and the 5 most recent event codes as shown in Table 3 If an event c...

Page 14: ... compressor will eventually overheat and shut off by its own internal overload since the motor s windings are not being cooled by refrigerant vapor Sand Or Dirt In The Sub Surface Tubing Prior to Initial Charging The following steps should be performed if debris removal is required after the field lines have been connected to the liquid line assembly 1 Recoverallrefrigerantfromfromthelinesettotheb...

Page 15: ...d Air In The Winter Or Cooled Air In The Summer Check system operational pressures for a potential refrigerant leak operational pressures will be too low NOTE If pressures are too high in the summer or too low in the winter the geothermal heat pump exchange field may have been overstressed This can be accomplished by either turning the system off use your supplemental back up heating during the wi...

Page 16: ...l Separator Bracket Check Valve Hot Gas Bypass Valve Coil Large Valve Small Valve EXV Valve Coil Solenoid Valve Coil Figure 6 Components H W L 8 72 11 25 13 86 16 38 19 90 22 40 1 54 5 42 5 26 Liquid Line to Air Handler Vapor Line to Air Handler Vapor Line to Earth Loop Liquid Line to Earth Loop Line Voltage Connections Low Voltage Connections Figure 5 Dimensions ...

Page 17: ...nnect to 24 vac 60va class 2 circuit See air handler installation instructions for control circuit and optional relay transformer kits 711415B Replaces 711415A 04 20 W2 W1 O C Y2 R Y1 RELAY THESE WIRES RELAY AND WELL SEAL VALVE ON 4 5 TON 14 17 5 kW UNITS ONLY CCH SUCTION TEMP TO 1PH POWER SUPPLY GND CONTACTOR T2 L2 T1 REVERSING VALVE 1 2 3 4 5 6 7 HOT GAS INJECTOR EXV MOTOR SUCTION PRESSURE SENSO...

Page 18: ...MMN36K B B6EMMN60K C B6EMMN60K C Physical Data Length L 25 1 25 1 25 1 25 1 Width W 25 2 25 2 25 2 25 2 Height H 30 5 30 5 30 5 30 5 Weight 165 170 215 220 Refrigerant Vapor Line O D Both to air handler and earth loop 3 4 3 4 7 8 7 8 Liquid Line O D Both to air handler and earth loop 1 2 1 2 1 2 1 2 Unit is shipped from factory with nitrogen holding charge Table 9 Electrical Physical Data Insulate...

Page 19: ... Star Wade Hampton Nome Yukon Koyukuk North Slope NOTE Zone 1 includes Hawaii Guam Puerto Rico and the Virgin Islands Figure 9 Climate Map IECC Zones Earth Loop Size ft ton 1 2 3A 3B 100 3C 4A 4B 80 4C 5 6 7 8 65 There are exceptions to the earth loop sizes shown in this table Within a climate zone the weather and underground conditions vary from place to place The earth loop length may need to be...

Page 20: ...e size Number of borehole s or Earth Loop s _____________________ Depth of each borehole or Earth Loop____________________ Ft Line set size Vapor line O D Inches _______ Liquid line O D inches ________ Line set distances to each well______________________ distance between the compressor and the air handler Distance feet ___________________________________ Tubing size Vapor line O D Inches _______ ...

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