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Form O-Y P/N 273647R5, Page 11

Thermostatic 

Expansion Valves

All refrigeration circuits have a thermostatic expansion valve. Thermostatic expansion 

valves do not have replaceable parts. If a replacement valve is required, it must be for 

R-410A refrigerant and must be sized correctly for the application. All refrigerant ser-

vice should be performed by a service technician qualified in R-410A refrigerant.
Replacement valve P/N's by Model, size, and circuit are listed in the table. Locations 

are shown in 

FIGURES 8

 through 

14

, shown on pages 11 through 14.

Thermostatic 

Expansion Valve

Thermostat Expansion (TXV) Valves by Circuit and P/N

Model / Size

A

B

DH - Low Enthalpy DH - High Enthalpy

YDHA & YDMA 060

234987

--

207303

--

YDHA 090

220556

--

--

207303

YDMA 090

220556

--

207303

--

YDHA & YDMA 120

234987

234987

--

207303

YDSA 120

234960

234960

--

--

YDHA & YDMA 150

220555

220555

--

207303

YDSA 150

220555

220555

--

--

YDHA & YDMA 180

220555

220555

207303

234960

YDSA 180

220555

220555

--

--

YDSA 210

220556

220555

--

--

YDHA & YDMA 210

220556

220556

207303

234960

YDHA & YDMA 240

220556

220556

207303

234960

YDHA & YDMA 300

261175

221175

234960

235729

YDHA & YDMA 360

220558

220558

234960

235729

 

 

Circuit A-1&2

Condenser Coil

Condenser Coil

Circuit A-1

Circuit A-1

Circuit A-2

View from  Compressor and

Evaporator 

Compressor

Solenoid

Filter

(Evaporator Coil Side)

Coil

 Tube

Valve

Model JDHA 062 and 092 (Cabinet 0) 

Circuit

 A-2

Circuit

 A-1

Circuit A-2

Coil with

Single Circuit

Modulating 

Valve

Drier

Evaporator 

Equalizer

TXV

Condenser Section Side

View from Cooling Cabinet Door

Refrigerant Circuits - Standard Cooling without Optional Bypass Valve or Reheat

FIGURE 8 - Cooling 

Circuit - Models 

YDHA and YDMA 

Sizes 060 and 090

3.5 Coils and Related Components (cont'd)

Seasonal Usage

 - At the beginning of the cooling season, inspect and clean the 

entire cooling coil cabinet including the condensate drain pan. Thoroughly clean dirt, 

algae, grease, and other contaminants. Inspect condensate drain pan, trap, and pip-

ing; fill trap with water to ensure proper operation. During a wintertime shutdown of 

the cooling system, it may be desirable to disconnect and remove all water from the 

trap and drain to prevent freeze damage. If local building codes permit, trap may be 

filled with an antifreeze solution. Or, piping may be designed with freeze plugs or 

other freeze protection methods (such as a heat tape). 

Year Round Usage

 - Climates or applications with cooling requirements year round 

require more frequent inspections of the cooling coil cabinet and condensate drains. 

Depending on climate, freeze protection of the trap may be required during non-

cooling days.

Condensate Drain 

Use and Maintenance

Содержание YDHA

Страница 1: ...an HVAC technician qualified in R 410A refrigerant and using proper tools and equipment Due to much higher pressure of R 410A refrigerant DO NOT USE service equipment or tools designed for R22 refrige...

Страница 2: ...ard Intensity Levels used in this Manual HAZARD INTENSITY LEVELS 1 DANGER Failure to comply will result in severe personal injury or death and or property damage 2 WARNING Failure to comply could resu...

Страница 3: ...the cooling coil condensate drain pan Clean the coil cabinet clean the drain pan and fill the trap Inspect clean condenser fans See Paragraph 3 4 page 10 Inspect clean all coils See Paragraph 3 5 page...

Страница 4: ...ng is field supplied Dirty Filter Switch for System Filters BE18 High Side Tubing Red Low Side Tubing Clear Dirty Filter Switch for Wheel Filters BE28 High Side Tubing Green Low Side Tubing Clear Opti...

Страница 5: ...2 2 3 3 1 1 2 2 2 3 3 2 2 3 3 H400 H402 1 1 2 2 2 3 3 1 1 2 2 2 3 3 2 2 3 3 H402 H502 2 2 2 3 3 2 2 2 3 3 3 3 H502 H602 2 2 2 3 3 2 2 2 3 3 3 H602 H702 3 3 3 3 H702 H802 3 3 3 3 H802 High Efficiency G...

Страница 6: ...20 150 4 16 x 25 211128 256666 3 YDHA YDMA 300 360 4 25 x 29 235757 235758 YDSA 180 210 FIGURE 2 Installing Replacement Supply Air Filters To access supply air filters open the cooling coil filter doo...

Страница 7: ...screws one on each end of the front cover Remove the cover 2 Slide filters out 3 Clean and dry filters 4 Return filters to hood and replace cover Filter Filter Filter Filter Cabinet Size 1 2 3 YSDA M...

Страница 8: ...crew locations Function When the main controller calls for supply fan operation a variable fre quency drive VFD responds to operate the motor The VFD is located on the high voltage electrical panel Se...

Страница 9: ...mper controls Options GF 1 9 see the system installation manual Form I Y FIGURE 6 Damper Actuator is mounted on the damper frame and is accessible through the Damper Access Door See FIGURE 1 page 4 Ou...

Страница 10: ...sical damage Inspect feeders piping connections coil headers and return bends for signs of fatigue rub bing and physical damage Clean the coils annually or more often if needed Use the proper tools an...

Страница 11: ...A 2 View from Compressor and Evaporator Compressor Solenoid Filter Evaporator Coil Side Coil Tube Valve Model JDHA 062 and 092 Cabinet 0 Circuit A 2 Circuit A 1 Circuit A 2 Coil with Single Circuit M...

Страница 12: ...and Condenser Section Evaporator Coil with intertwined Circuits A B Solenoid Valve Filter Drier Filter Drier View from Cooling Cabinet Door Evaporator Coil Side TXV Valves Evaporator Coil Modulating...

Страница 13: ...and pro vides protection and diagnostics for compressor operation Service See Troubleshooting Chart in Paragraph 7 2 on page 45 for identification of alarm codes Use only factory authorized replacemen...

Страница 14: ...ressure gauge to the suction line and block the entering air to the evaporator coil Suction pressure will drop and the hot gas bypass valve should begin to open at a approximately 115 psi and will be...

Страница 15: ...el s dual sensor input allows for the control of one or two independent refrigerant circuits sharing the same fan motor s Only open drip proof PSC or Shaded Pole motors are applicable for motor speed...

Страница 16: ...lt factory for more information Assuming a 200 RPM minimum speed and 1 200 RPM full motor speed the motor cycles OFF at 200 RPM and back ON at 300 RPM and then modulates back to 200 RPM before cycling...

Страница 17: ...ble to determine accurate superheat and subcooling 2 If the circuit is equipped with an optional hot gas bypass valve the valve must be disabled before measuring superheat and subcooling Locate the sh...

Страница 18: ...state province and local laws Determine SUPERHEAT Measure and record temperature insulate probe from surrounding air temperature and pressure in the suction line at the compressor inlet STEP 1 Record...

Страница 19: ...201 5 70 21 1 Temperature Pressure Conversion Chart All systems have a modulating capacity digital scroll compressor in Circuit A with a digital compressor controller in the electric control compartm...

Страница 20: ...2635 216397 262803 216397 YDHA YDMA 240 208 240 3 60 266061 216402 216695 216402 259288 216394 262801 216394 480 3 60 266062 216404 216696 216404 259355 216396 262802 216396 575 3 60 266063 216405 216...

Страница 21: ...he replacement compressor is identical to the model being replaced All system components are matched to the compressor Replacing a compres sor with a model other than the manufacturer specified replac...

Страница 22: ...2 CC Copeland Ultra 32 3MAF Mobil EAL Arctic 22 CC Uniqema Emkarate RL32CF or Uniqema RL32 3MAF POE oil absorbs moisture much quicker and to a greater degree than standard mineral oil The compressor m...

Страница 23: ...eater alloy is recommended To prevent oxidation purge tubing with 2 3 psig of regulated dry nitrogen while it is being brazed Open the service valve as needed to release the nitrogen Do not allow mois...

Страница 24: ...g controls before turning on power to warm up crankcase heaters CAUTION Crankcase heaters must be allowed to warm up for at least 24 hours prior to startup Disable cooling con trols before turning on...

Страница 25: ...Voltage Imbalance 100 VA VD VA If the imbalance is within the 2 tolerance voltage imbalance is not a problem and the system may be operated If the imbalance exceeds the 2 tolerance follow the procedu...

Страница 26: ...suring its temperature Another active circuit will influence the reading and make it impossible to determine accurate superheat and subcooling 2 If equipped with an optional hot gas bypass disable the...

Страница 27: ...grammable Controller with Integral Display 3 8 2 Voltage Protection Option PL4 Function Phase loss and low or high voltage can cause damage to electrical com ponents This safety control monitors phase...

Страница 28: ...an integral part of the system Energy Recovery Wheel Optional Preheat Elements Exhaust Damper Outside Air Sensor Power Exhaust FIGURE 20 Energy Recovery Wheel Removing Cleaning and Replacing Wheel Se...

Страница 29: ...retaining brackets on both sides of the opening Position a clean segment with the imbedded stiffeners toward the motor side of the wheel Holding the segment as vertically as possible and centered betw...

Страница 30: ...paper between the wheel surface and the seal Turn the wheel so that the seal is lined up with a segment spoke Adjust the seal toward the wheel surface and slide the feeler gauge folded paper along the...

Страница 31: ...3 60 272506 460 3 60 272507 575 3 60 Optional Preheat frost Control Wheel Supply Air Discharge Sensor The supply air discharge sensor monitors wheel operation and if equipped with pre heat controls o...

Страница 32: ...ve See Hazard Levels page 2 5 1 Gas Heat Controls 75VA Transformer Terminals Venter Motor Speed Controller AG73 AG74 Pressure Switches for Single Heat Section or Right first Furnace in a Dual Heat Sec...

Страница 33: ...A and YDHA Manual for Space Temperature Control System Options D19 form CP Y D19 or option D21 form CP Y D21 Flue Collection Box Venter Assembly Single Heat Section Manifold Assembly with 2 Stage Opti...

Страница 34: ...Control in the Model YDSA and YDHA Manual for Space Temperature Control System Options D19 form CP Y D19 or option D21 form CP Y D21 Venter Assembly Optional High Gas Pressure Switch Ignitor Limit Dua...

Страница 35: ...orrected depress the red button on the switch to reset it Vent Temperature Limit Switch IMPORTANT When using a multimeter to troubleshoot the 24 volt circuit place the meter s test leads into the 5 or...

Страница 36: ...s indicated gas pressure has reached equilibrium close the manual shutoff valve Observe the gas pressure There should be no loss of gas pressure on the manometer If the manometer indicates a loss of...

Страница 37: ...w is sensed in the system On start up when the heater is cold the sensing pressure is at the most negative level and as the heater and flue system warm up the sensing pressure becomes less negative Af...

Страница 38: ...90 1 90 1 50 Yellow 273360 3 90 0 90 0 75 Yellow 205443 48 56 H602 300 000 3 90 1 90 1 50 Yellow 273360 3 90 0 90 0 75 Yellow 205443 42 56 H702 300 000 3 90 1 90 1 50 Yellow 273360 No low pressure sw...

Страница 39: ...the control is factory set at either 200 F or 250 F and is non adjustable If the setpoint is reached the limit control will interrupt the electric supply to the gas valve This safety device provides...

Страница 40: ...nd wheel assembly Keep all hardware removed to be used in re assembling and installing the replace ment parts 1 Turn off the gas and disconnect the electric power 2 Open the burner control compartment...

Страница 41: ...d burner rack for any damage or deterioration If a burner has any damage or signs of deterioration replace it Clean the burner orifices with air pressure Do not ream orifices After cleaning re assembl...

Страница 42: ...Y4 80 Modulation DAT 5 F 2 8 C below setpoint Y4 70 Modulation DAT 5 F 2 8 C above setpoint Stg 5 NO12 ON 5 min Y4 85 Modulation DAT 5 F 2 8 C below setpoint Y4 75 Modulation DAT 5 F 2 8 C above setpo...

Страница 43: ...of the thermal expansion valve Check for pressure drop across the filter drier 4 Defective low pressure switch 4 Check switch opens 35 psi closes 50 psi If defective replace low pressure switch P N 21...

Страница 44: ...t Paragraph 3 6 and adjust thermal expansion valve 3 Low suction pressure 3 See I Suction pressure too low above 4 Defective compressor 4 See G High suction pressure above K Compressor short cycles 1...

Страница 45: ...ing capacity compressor will be allowed to restart after a 30 minute delay and after the thermistor temperature is below 250 F Compressor will lockout after 5 alerts within 4 hours and can only be res...

Страница 46: ...wiring and connections Refer to wiring diagram provided with unit 7 3 Troubleshooting the Heat Section 7 3 1 General Troubleshooting Electric Heat Section Option E__ LED State Indicates Additional Inf...

Страница 47: ...auses 5 Reset lockout by interrupting control 6 Combustion air proving switch not closing 6 Clean venter wheel a Remove obstructions from vent b Replace faulty tubing to pressure switch 7 Faulty combu...

Страница 48: ...mmended superheat 18 Superheat 26 System Startup 25 T Temperature Pressure Conversion Chart 19 Troubleshooting Compressor Digital Controller 45 Troubleshooting Electric Heat Section 46 Troubleshooting...

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