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Rheem ECONET RP2024BJVCA, Руководство по установке

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Descriptions of the VSODC status codes are provided below.

NOTE:

 Codes must be read from correct side to avoid an error in reading codes.

Dual 7-Segment

LEDs Display

Code

Status Code Description

Status/Possible Cause –

Troubleshooting Information

J¶-PYZ[:[HNL*VVSPUN

JVVSPUN

5VYTHSVWLYH[PVU

FLASHING

J¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

JVVSPUNK\YPUNHUHJ[P]LHU[PZOVY[J`JSL[PTLYVY

TPUPT\TY\U[PTLY

࠮>HP[\U[PS\UP[[PTLYOHZL_WPYLKVYWYLZZ[OL

;,:;I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

*¶:LJVUK:[HNL*VVSPUN

<UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUKZ[HNL

JVVSPUN

5VYTHSVWLYH[PVU

FLASHING

*¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

࠮;OL\UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUK

Z[HNLJVVSPUNK\YPUNHUHJ[P]LHU[PZOVY[J`JSL

[PTLYVYTPUPT\TY\U[PTLY

࠮>HP[\U[PS[PTLYOHZL_WPYLKVYWYLZZ[OL;,:;

I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

K¶+LMYVZ[(J[P]L

;OL\UP[PZ\UKLYNVPUNHKLMYVZ[J`JSL

5VYTHSVWLYH[PVU

K¶H[H

࠮9LWSHJLTLTVY`JHYK^P[OJVYYLJ[Z`Z[LT

PUMVYTH[PVU

O¶-PYZ[:[HNL/LH[7\TW
W\TW

5VYTHSVWLYH[PVU

FLASHING

O¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

OLH[W\TWK\YPUNHUHJ[P]LHU[PZOVY[J`JSL[PTLY

VYTPUPT\TY\U[PTLY

࠮>HP[\UP[[PTLYOHZL_WPYLKVYWYLZZ[OL;,:;

I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

/¶:LJVUK:[HNL/LH[7\TW

<UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUKZ[HNL

OLH[W\TW

5VYTHSVWLYH[PVU

FLASHING

/¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

࠮;OL\UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUK

Z[HNLOLH[W\TWK\YPUNHUHJ[P]LHU[PZOVY[J`JSL

[PTLYVYTPUPT\TY\U[PTLY

࠮>HP[\UP[[PTLYOHZL_WPYLKVYWYLZZ[OL;,:;

I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

¶:[HUKI`

5VJVTTHUKMVY\UP[VWLYH[PVU

5VYTHSVWLYH[PVU

9.4 Status and Diagnostic Codes

9.0 DIAGNOSTICS & TROUBLESHOOTING

Diagnostics

Dual 7-Segment

LEDs Display

Code

Status Code Description

Status/Possible Cause –

Troubleshooting Information

J¶-PYZ[:[HNL*VVSPUN

JVVSPUN

5VYTHSVWLYH[PVU

FLASHING

J¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

JVVSPUNK\YPUNHUHJ[P]LHU[PZOVY[J`JSL[PTLYVY

TPUPT\TY\U[PTLY

࠮>HP[\U[PS\UP[[PTLYOHZL_WPYLKVYWYLZZ[OL

;,:;I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

*¶:LJVUK:[HNL*VVSPUN

<UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUKZ[HNL

JVVSPUN

5VYTHSVWLYH[PVU

FLASHING

*¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

࠮;OL\UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUK

Z[HNLJVVSPUNK\YPUNHUHJ[P]LHU[PZOVY[J`JSL

[PTLYVYTPUPT\TY\U[PTLY

࠮>HP[\U[PS[PTLYOHZL_WPYLKVYWYLZZ[OL;,:;

I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

K¶+LMYVZ[(J[P]L

;OL\UP[PZ\UKLYNVPUNHKLMYVZ[J`JSL

5VYTHSVWLYH[PVU

K¶H[H

࠮9LWSHJLTLTVY`JHYK^P[OJVYYLJ[Z`Z[LT

PUMVYTH[PVU

O¶-PYZ[:[HNL/LH[7\TW
W\TW

5VYTHSVWLYH[PVU

FLASHING

O¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

OLH[W\TWK\YPUNHUHJ[P]LHU[PZOVY[J`JSL[PTLY

VYTPUPT\TY\U[PTLY

࠮>HP[\UP[[PTLYOHZL_WPYLKVYWYLZZ[OL;,:;

I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

/¶:LJVUK:[HNL/LH[7\TW

<UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUKZ[HNL

OLH[W\TW

5VYTHSVWLYH[PVU

FLASHING

/¶(U[PZOVY[J`JSL[PTLYTPU\[LZVYTPUPT\T

Y\U[PTLYZLJVUKZHJ[P]L

࠮;OL\UP[OHZYLJLP]LKHJVTTHUKMVYZLJVUK

Z[HNLOLH[W\TWK\YPUNHUHJ[P]LHU[PZOVY[J`JSL

[PTLYVYTPUPT\TY\U[PTLY

࠮>HP[\UP[[PTLYOHZL_WPYLKVYWYLZZ[OL;,:;

I\[[VU[VKLMLH[ZOVY[J`JSLKLSH`

¶:[HUKI`

5VJVTTHUKMVY\UP[VWLYH[PVU

5VYTHSVWLYH[PVU

Содержание ECONET RP2024BJVCA

Страница 1: ...LIFIED LICENSED SERVICE PERSONNEL FOR PROPER INSTALLATION ADJUSTMENT AND OPERATION OF THIS UNIT READ THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING INSTALLATION OR OPERATION FAILURE TO FOLLOW THESE I...

Страница 2: ...by Pressures 28 5 8 4 Final Charging by Liquid Subcooling 29 5 8 5 R 410A Temperature Pressure Chart 29 5 9 Completing Installation 29 6 0 NORMAL SEQUENCE OF OPERATION 30 6 1 Cooling Mode 30 6 2 On D...

Страница 3: ...ents accessories or devices may adversely affect the operation of the heat pump and may also endanger life and property The manufacturer disclaims any responsibility for such loss or injury resulting...

Страница 4: ...ual 2 3 Importance of Quality Installation A quality installation is critical to assure safety reliability comfort and customer satisfaction Strict adherence to applicable codes the information in thi...

Страница 5: ...ionals For technical assistance contact your Distributor Service Coordinator 2 5 Importance of Proper Indoor Outdoor Match Ups To assure many years of reliable operation and optimum customer comfort a...

Страница 6: ...m RECCOMMENDED SERVICE PANELS INLET CONNECTIONS HIGH LOW VOLTAGE ACCESS ALLOW 24 610 mm OF CLEARANCE ST A1226 02 00 ALLOW 60 1524mm OF CLEARANCE SERVICE PANELS INLET CONNECTIONS HIGH LOW VOLTAGE ACCES...

Страница 7: ...combustible R 410A and air should never be mixed in tanks or supply lines or be allowed to accumulate in storage tanks Leak checking should never be done with a mixture of R 410A and air Leak checking...

Страница 8: ...ndations and requirements will take precedence Refrigerant piping and wiring should be properly sized and kept as short as possible to avoid capacity losses and increased operating costs Locate the un...

Страница 9: ...nal spaces of the owner and those spaces on adjoining property To prevent noise transmission the mounting pad for the outdoor unit should not be connected to the structure and should be located a suff...

Страница 10: ...Bay 36 New Haven 15 MAINE NEBRASKA Bismarck 25 Knoxville 8 La Crosse 32 DELAWARE Caribou 100 Grand Island 30 Fargo 34 Memphis 5 Madison 32 Wilmington 13 Portland 62 Lincoln 20 Williston 25 Nashville...

Страница 11: ...ulate in the low spots in the vapor line instead of being returned to the compressor crankcase This is especially true for long line lengths Variable speed systems present an additional challenge due...

Страница 12: ...heat gain or loss Refer to Table 2 for capacity loss multipliers for various vapor line diameters and equipment line lengths This table does not ac count for any capacity loss due to heat gain or loss...

Страница 13: ...ted liquid line size Absorption of heat prior to expansion device Excessive vertical separation between the out door unit and indoor coil Restricted liquid linear filter drier Kinked liquid line The f...

Страница 14: ...50 0 98 50 0 97 50 0 96 38 0 95 1 2 7 8 25 0 99 50 0 99 50 0 98 50 0 97 50 0 96 50 0 95 3 8 1 1 8 25 1 00 50 1 00 50 1 00 50 0 99 50 0 99 38 0 99 1 2 1 1 8 25 1 00 50 1 00 50 1 00 50 0 99 50 0 99 50...

Страница 15: ...9 53 3 8 22 23 7 8 8 0 99 15 0 99 15 0 98 15 0 97 15 0 96 12 0 95 12 7 1 2 22 23 7 8 8 0 99 15 0 99 15 0 98 15 0 97 15 0 96 15 0 95 9 53 3 8 28 58 1 1 8 8 1 00 15 1 00 15 1 00 15 0 99 15 0 99 12 0 99...

Страница 16: ...liquid refrigerant can be heated to form vapor insulating the liquid line is required Use clean dehydrated sealed refrigeration grade tubing Always keep tubing sealed until tubing is in place and con...

Страница 17: ...INSULATED LIQUID LINE IN UNCONDITIONED SPACE INSULATED VAPOR LINE FULL LENGTH Figure 3 For applications with the outdoor unit and indoor unit on the same level the following is required Insulated liq...

Страница 18: ...pansion device Verify that the pressure drop is not greater than 50 PSI 345 kPa For elevations greater that 25 8 m a lower subcooling can be expected Verify there is at least 5 F 2 8 C of liquid sub c...

Страница 19: ...space only Follow the proper line sizing maximum linear and equivalent length maximum vertical separa tion charging requirements and oil level adjust ments spelled out in this document Verify at leas...

Страница 20: ...ing with a clean dry cloth before soldering Clean out debris chips dirt etc that enters tubing or service valve connections Wrap valves with a wet rag or thermal barrier compound before applying heat...

Страница 21: ...coil evacuation see Sections 4 7 and 4 8 for evacuation and final leak testing The vapor line must be insulated for its entire length to prevent dripping sweating and prevent performance losses Close...

Страница 22: ...e thermostat many features and benefits are lost Therefore a conventional 24VAC 2 stage thermostat should only be used in temporary emergency situations until communication issues with the EcoNetTM co...

Страница 23: ...installation manual for further details on setting up the system and available adjustment options 4 9 4 Conventional 24VAC Thermostat Control Wiring Connections The P20 B series of heat pumps allow th...

Страница 24: ...ons are tight DO NOT connect aluminum field wire to the P20 terminal block TYPICAL SINGLE STAGE THERMOSTAT HEAT PUMP WITH AIR HANDLER 4 9 Control Wiring cont 4 10 Power Wiring TYPICAL SINGLE STAGE THE...

Страница 25: ...thin 45 seconds of power being applied the EcoNetTM Control Center should detect the indoor and outdoor units A 0 for Standby Mode will be displayed on the Variable Speed Outdoor Control VSODC 5 3 Eco...

Страница 26: ...units and repeat steps 1 6 8 Note When charging in the heating mode the system will initiate a defrost cycle every 34 minutes if the coil temperature is below 35 F 1 7 C to assure the coil stays frost...

Страница 27: ...TICE AHRI rated CFM may differ slightly from values in the table below The refrigerant charge for all systems should be checked against the Charging Chart located inside the access panel cover WARNING...

Страница 28: ...evice adjust the refrigerant charge based on the actual line set length If the entire system has been evacuated add the total calculated charge IMPORTANT Charging by weight is not always accurate sinc...

Страница 29: ...emperature Pressure Chart below to note the corresponding saturation temperature for R 410A at the measured liquid pressure Liquid Saturation Temperature SAT _____ F _____ C 3 Note the liquid line tem...

Страница 30: ...ooling operation the compressor speed outdoor fan speed and indoor air flow level will respond by ramping up or down as required to meet the building load exactly rather than simply cycling on and off...

Страница 31: ...plemental electric heat as required to meet the building load The indoor air flow will be forced to operate at the maximum level for the system For 13kW heaters and higher the supplemental electric he...

Страница 32: ...mp to a pre determined oil circulation speed for 6 minutes 7 The system returns to normal heating operation as directed by the EcoNetTM Control Center NOTE Should the outdoor ambient temperature therm...

Страница 33: ...rost parameters and low ambient cooling operational conditions This thermistor is provided with the suction line thermistor as a single harness 7 4 Discharge Line Thermistor P20 heat pumps are equippe...

Страница 34: ...provided to indicate if the EXV is in the process of opening or closing The following is a list of features on the VSODC and location of each 1 Thermostat Terminals 2 Communication wire terminals 3 M...

Страница 35: ...7 0 COMPONENTS CONTROLS 7 5 5 Superheat Offset DIP Switch Settings DIP Switch Bank on the Right Although the factory programmed superheat setting is considered to be the most efficient setting for eac...

Страница 36: ...Superheat Measurement The display is to show the following options HI Superheat is 5 F 2 8 C away from SH_SP hI Superheat is between 5 2 8 C and 1 5 F 0 8 C away from SH_SP 00 Superheat is between 1 5...

Страница 37: ...stator for serviceability An internal check valve is provided that assures unrestricted flow in the reverse direction when the system is operating in the cooling mode For the P20 model line there are...

Страница 38: ...and is displayed on the EcoNetTM Control Center 7 12 Outdoor Fan Motor All P20 heat pumps are equipped with variable speed outdoor fans controlled by a pulse width modulated signal PWM from the Variab...

Страница 39: ...aired with the saturated suction temperature and used by the VSODC to calculate superheat and adjust the outdoor EXV to maintain the correct superheat level IMPORTANT The clamp on the suction line the...

Страница 40: ...he Inverter will gradually increase the compressor RPM until the compressor returns to normal speed based on the capacity demand Should the discharge temperature rise to 235 F 113 C again the Inverter...

Страница 41: ...mal system operation will resume and the fault codes will be cleared from the VSODC and EcoNetTM Control Center displays 6 If after 5 minutes cooling or heating demand persists and the pressure has no...

Страница 42: ...failed See the table below for the default operation for a sensor failure Exiting an Active Protection Lock Out mode can be accomplished by disconnecting electrical power to both the indoor and outdoo...

Страница 43: ...played on the dual 7 segment LEDs and a call for unit operation is present the TEST mode causes 1 A t to display momentarily on the dual 7 segment display 2 The compressor will start and the outdoor f...

Страница 44: ...TPUPT T Y U PTLY HP UP PTLY OHZ L_WPYLK VY WYLZZ OL I VU V KLMLH ZOVY J JSL KLSH HUKI 5V JVTTHUK MVY UP VWLYH PVU 5VYTHS VWLYH PVU 9 4 Status and Diagnostic Codes 9 0 DIAGNOSTICS TROUBLESHOOTING Diagn...

Страница 45: ...vice window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is what will be displayed on the VSODC 9...

Страница 46: ...rvice window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is what will be displayed on the VSODC D...

Страница 47: ...at the EcoNet Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is...

Страница 48: ...rvice window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is what will be displayed on the VSODC 9...

Страница 49: ...at the EcoNet Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is...

Страница 50: ...rvice window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is what will be displayed on the VSODC 9...

Страница 51: ...at the EcoNet Control Center under Service window Current Faults or in the Fault History and will be time and date stamped VSODC Variable Speed Outdoor Unit Control EcoNet control board fault code is...

Страница 52: ...this fault occurs before VSODC will restart the compressor If this fault occurs 3 times during a single call for operation the VSODC will lock out the compressor to keep it from continuing to operate...

Страница 53: ...ation There is a 5 minute delay after this fault occurs before VSODC will restart the compressor If this fault occurs 3 times during a single call for operation the VSODC will lock out the compressor...

Страница 54: ...to keep it from continuing to operate and flash an L on the dual 7 segment LEDs followed by a 15 IMPORTANT This mode of active protection must be manually reset L16 Microprocessor Fault A912_O Inverte...

Страница 55: ...ing to operate and flash an L on the dual 7 segment LEDs followed by a 16 IMPORTANT This mode of active protection must be automatic reset once the discharge line thermistor fault is corrected L16 Dis...

Страница 56: ...here are two scenarios that will cause active protection during an LPC trip when the unit is in the heating mode Active Protection With Hard Lockout If the LPC opens three 3 times within 120 minutes f...

Страница 57: ...que is greater than the designed operating envelope permits the inverter will automatically begin to slow the compressor operation If this fold back is not successful in bringing the compressor back i...

Страница 58: ...identifies issue s reading the model data from the memory card the VSODC will automatically shut the compressor off and keep it from operation When this fault occurs the VSODC will lock out the compre...

Страница 59: ...JVKL YV ISLZOVV PUN VU YVS PU SVJRV TVKL OLJR MH S OPZ VY HUK YLMLY V KPHNUVZ PJ JOHY HUK OL 6 PHNUVZ PJ VKLZ ZLJ PVU VM OPZ THU HS HP PUN MVY HU P ZOVY J JSL KLSH V JSLHY 5V PJL VY ZVSPK JVTT 3 JOLJR...

Страница 60: ...6 KVVY OLJR HS L SVZLK 9LZ YPJ LK 0UKVVY 4L LYPUN L PJL 9LZ YPJ LK PS LY YPLY PY 6 KVVY VPS 0UVWLYH P L 6 KVVY HU 6 LYJOHYNL 9LJPYJ SH PVU VM 6 KVVY PY 5VUJVUKLUZPISLZ PNOLY OHU TIPLU PY U LYPUN 6 KVV...

Страница 61: ...NL 3V 0UKVVY LTWLYH YL HK VTWYLZZVY 0UKVVY OLJR HS L SVZLK 9LZ YPJ LK 6 KVVY 4L LYPUN L PJL 9LZ YPJ LK PS LY YPLY PY 0UKVVY VPS 0UVWLYH P L 0UKVVY HU 6 LYJOHYNL 5VUJVUKLUZPISLZ PY PY PS LYZ YVUN 0UKVV...

Страница 62: ...rost Sensor in Wrong Location Wrong Defrost Timer Setting Reversing Valve Stuck Welded Reversing Valve Relay on Control Board Loose Defrost Sensor Check Coil Sensor Connector Defrost System Inadequate...

Страница 63: ...vision Addition and Subtraction Our formula doesn t have any Exponents so we can eliminate that Also there is no Addition Multiplication and Division similar to Addition and Subtraction priority comes...

Страница 64: ...made with the sensor disconnected from the control board Again comparing the results must be done against a calibrated tester A glass of water mixed completely with ice chips and given several minutes...

Страница 65: ...rter input terminals voltage must be between 187 252VAC when unit is operating Add refrigerant Registers sweat Low indoor airflow Increase speed of blower or reduce restriction Replace air filter High...

Страница 66: ...aLK PYL MLLKPUN UP VYYLJ HUK JVTWSL L KPHNUVZPZ PNO SPUL VS HNL 7V LY JVTWHU WYVISLT H L WYVISLT JVYYLJ LK PNO OLHK WYLZZ YL 6 LYJOHYNL OLJR Z Z LT JOHYNL PY OLH W TW JVPS SLHU JVPS H S VY YVUN ZPaL O...

Страница 67: ...Y OLYTVZ H OLJR MVY JVU YVS VS HNL V JVU HJ VY JVPS VTWYLZZVY JVU YVS JPYJ P PNO WYLZZ YL Z P JO 3V WYLZZ YL J V TIPLU OLYTVZ H H LY OLH PZ HJ P L 5V VS HNL H PUW V PU LY LY SV U M ZLZ VY YPWWLK JPYJ...

Страница 68: ...PVU WYLZZ YL 3V JOHYNL OLJR Z Z LT JOHYNL 9LMYPNLYHU SLHRZ 9LWHPY HUK YLJOHYNL VSK UVPZ JVTWYLZZVY S NNPUN PS PVU VM VPS P O YLMYPNLYHU 6IZLY L WPWPUN N PKLSPULZ 5VPZ JVTWYLZZVY 4PNYH PVU OLJR Z H LY...

Страница 69: ...UK PUZ SH LK V OL HWVY SPUL 0UJVYYLJ S ZLUZPUN HWVY SPUL LTWLYH YL 9LWSHJL Z J PVU OLYTPZ VY HZZLTIS J PVU OLYTPZ VY PUJVYYLJ S JHSPIYH LK 0M OHYULZZ OHZ H ZOVY YLWSHJL OHYULZZ 0M NH NL WYLZZ YL TLHZ...

Страница 70: ...U SPUL P O PUZ SH PVU OHUNL OL Z WLYOLH VMMZL KPW Z P JOLZ V PUJYLHZL Z WLYOLH LYPM Z J PVU OLYTPZ VY YLZPZ HUJL PZ JVYYLJ HUK WYVWLYS H HJOLK HUK PUZ SH LK V OL HWVY SPUL 0UJVYYLJ S ZLUZPUN HWVY SPUL...

Страница 71: ...ence of the suction line Ensure sensing bulb is located properly Check for blocked distributor tubes Recover refrigerant change filter drier evacuate system and recharge Moisture freezing and partiall...

Страница 72: ...PNO Indoor Suction Pressure Transducer Faulty Measurement 3V 3V PNO PNO Poorly Insulated Indoor Vapor Line Thermistor PNO PNO 3V 3V HEATING MODE TROUBLESHOOTING TIPS SYSTEM PROBLEM INDICATORS DISCHAR...

Страница 73: ...nnect electrical power to the unit before removing the top panel or any electrical panel as the fan motor could start at any time and live electrical connections will be exposed Annual cleaning of the...

Страница 74: ...N PRESS TRANSDUCER WIRE NUT 24 VAC 24 VAC INPUT COMPONENT CODES RV REVERSING VALVE WIRE COLOR CODE BK BLACK BR BROWN BL BLUE G GREEN G Y GRAY O ORANGE PR PURPLE R RED W WHITE Y YELLOW REV PART NO WIRI...

Страница 75: ...eep the system operating Thereby an open switch would indicate to the system to shut down a Press the back arrow in the bottom left of the dehumidification screen to return to the settings screen b Pr...

Страница 76: ...sense an open state between the Aux 1 and the Aux C terminals 9 Exiting the Test Mode NOTE While the test mode is active the thermostat will not permit return to the home screen a To turn the unit of...

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