Envision Peripherals Series User's Manual
Contents
1. E Series or Premier NS SPLIT INSTALLATION MANUAL Refrigeration The Envision series comes with a holding charge The charge must be adjusted in the field based on performance Refrigeration piping on the split consists of installing a brazed copper line set between the blower coil unit and the unit s split compressor section To select the proper tube diameters for the installation refer to the table on page 9 Line sets over 60 feet long are not recommended because of oil return and pressure drop problems The suction line must always be insu lated Handle and route the line sets carefully to avoid kinking or bending the tubes If the line set is kinked or distorted and it cannot be formed back into its original shape the bad portion of the pipe should be replaced A restricted line set will affect the performance of the system Connection to Air Coil Figures 1 and 2 illustrate typical Envision Split installations The table on page 9 shows typical lineset diameters and maximum length As in all R 410A equipment a reversible liquid line filter drier is required to insure all moisture is removed from the system This drier should be replaced whenever breaking into the system for service All linesets should be insulated with a minimum of 1 2 closed cell insulation All insulation should be painted with UV resistant paint or covering to insure long insulation life Fasten the copper line set to the blower coil unit as instructed by th2. sur out i 5 Ol 1 Test Nom Ot 2 Speed 1 Speed ap O O Switch Condensate overflow Optional Not 6 o 2 02 Loop Well O 2 Normal Finish on 2 Note 2 9 Orange wp aro Remoteunt Used 7 O 3 Ol 3 Fan Com O 3 No RPM RPM 3 A Switch High pressure Without f range s us O 4 O 4 Dehum Norm 04 Electro Heat Normal Ta Switch Low pressure 1 LoopPump NOTE 1 Q 5 O 5 NoHtg3 Htgs O 5 Envision E Series or Premier 10 gt Not Used bs e 6 Inputs Norm 3 Not Used de OJ 7 Outputs Norm F br Switch Hot Water On Off Acc Com s 8 lO 8 Pulse L Constant L NOTE 4 XT HWL Acc NC O 9 1 gt Pink Polarized connector Oo 10 12 Yellow reo m gt Iu wet 3 s 5 Yelow CA Comfort Alert 13 gt Blue oO cc Compressor Contactor LP co Condensate overflow sensor Main Logic PCB e sh Blue CRI DHW pump relay E x CR2 Loop pump relay rer Black DES HP CR3 PSC Fan Speed Relay 14 gt Black CR4 PSC Fan Power Relay cS Compressor Solenoid DC Coil F1 and F2 Fuses HE Heater element HP High pressure switch Comfort Alert Status ER1 to ERA Aux heat stage relays R Yi Diagnostic Modes LED Flash Code Description Luo T ral pese Switch R i Green Solid Module Has Power PB2 ower blocks lt LED Normal Display Mode Current Fault Status Inputs Outputs Outputs2 Red Solid Yi Present But Compressor Not Running PS Power strip i m RO Field Selection Dips 1 On 6 On 7 On
3. 1 Off 6 On 7 On 6 Off 7 On 6 On 7 Of 6 Off 7 Off ce 1 Long Run Time SH Si a i ode 2 System Pressure Trip package 12 position 9 R d Drain Drain pan overflow Lo Drain pan overflow g a Y1 Compressor 0 Blower Lo Code 3 Short Cycling SW2 DIP package 8 position a RO Water Flow FP thermistor loop lt 15 F well lt 30 F Lockout FP thermistor loop lt 15 F well lt 30 F Y2 Compressor Hi Blower Med Code 4 Locked Rotor SW3 DIP package 5 position E G n High Press High Pressure gt 600 PSI Lockout High Pressure gt 600 PSI o RV Blower Hi Yellow Code5 Open Circuit SW4 Hot water pump enable switch lt Low Press Comp Low Pressure 40 PSI Lockout Low Pressure lt 40 PSI G FAN Aux Heat 1 Code 6 Open Start Circuit TS Thermal limit switch Y f Air Flow ECM2 RPM 100 rpm Lockout ECM2 RPM 100 rpm w DHWPump Aux Heat 2 Code 7 _ Open Run Circuit m Gi Hot water limit sensor R Le Status Microprocessor malfunction Not Used SL1 Loop Pump 1 AuxHeat 3 Cole E BEEN SR x E Rer DHW Limit HWL thermistor gt 130 F HWL thermistor gt 130 s LoopPump2 Aux Heat 4 WoL Water Coil Limit Sensor SW e e 010 DHW pump switch off DHW pump switch off E Green LED not flashing 97P774 31 3 9 07 15 NS SPLIT INSTALLATION MANUAL Microprocessor Control Startup The unit will not operate until all the inputs and safety controls are checked for normal conditions At first power up a four minute d
4. D Dual Capacity Future Option Cabinet Configuration A S Outdoor Split Hot Water Option Unit Capacity 0 None Vintage Voltage A Current 1 208 230 60 1 Physical Characteristics Model 026 038 049 064 72 Compressor 1 each Dual Capacity Scroll Factory Charge R410a oz kg Coax and Water Piping Water Connections Size Swivel in mm HWG Connection Size Swivel in mm Coax amp Piping Water Volume gal I 189 236 250 271 Weight Operating Ib kg 186 107 113 123 Weight Packaged Ib kg Notes 4 9 08 All units have TXV expansion devices and 1 2 12 2mm amp 3 4 19 1mm electrical knockouts NS SPLIT INSTALLATION MANUAL General Installation Information Safety Considerations WARNING Before performing service or maintenance operations on a system turn off main power AN switches to both units Turn off accessory heater power switch if applicable Electrical shock could cause personal injury Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electrical components Only trained and qualified ser vice personnel should install repair or service heating and air conditioning equipment Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electri cal components Only trained and qualified service personnel should install repair or service he
5. OD 7 8 OD 1 2 OD 1 1 8 OD 1 2 OD NDS072 NAH060 7 8 OD 1 2 OD 7 8 OD 1 2 OD 1 1 8 OD 1 2 OD Notes Lineset charge for R410A is 0 50 oz per ft for 3 8 and 1 0 oz per ft for 1 2 tube Rev 4 1 08 Initial Total System Charge Factory Split charge lineset charge 20 oz then adjust charge by subcooling and superheat measurements NS SPLIT INSTALLATION MANUAL Physical Data 5 83 054 3 8 9 52 Evaporator Coil E TE 0222 Liquid line connection in mm sweat 3 8 9 52 Refrigerant R 410a QUES 3 4 10 05 T 10 1279 x 254 ECM variable speed 11746 Filter Standard 1 51mm MERV3 disposable in mm 20 x 24 508 x 635 208 230 Toh 220 9979 Operating weight 105 kg 195 88 45 200 90 71 1 11 08 6 94 0 64 3 8 19 521 Hydronic Coil Fins per inch Water In connection in mm sweat 7 8 22 22 Water Out connection in mm sweat 7 8 22 22 QUES Condensate drain connection FPT in mm 3 4 19 05 Ti 10 279 x 254 ECM variable speed 1746 Filter Standard 1 51mm MERV3 disposable in mm 20 x 24 508 x 635 208 230 iph 220 09 79 Operating weight 105 kg 200 90 71 3 11 08 10 NS SPLIT INSTALLATION MANUAL Envision Coil Nomenclature NR A c 026 c Cabinet Model Type C Encased NR Envision Refrigerant Coil U Uncased NH Envision Hydronic Coil Capacity Configuration Refrigerant Models A A Coil 026 MB
6. Series or Premier 2 speed units 3 Comfort Alert fault output to Premier Control Board 4 SW2 8 must be in the OFF postion for pulsed L lockout signal and in the ON position for constant L lockout signal 5 DHW pump only in models with hot water generation option Ext Pump Blue Red Black 6 Connection of remote unit that does not have a loop pump for slave operation 1 2 hp Total 1 ta 208 230 60 1 Pet f Comfort Alert Unit Power cc OO 208 230 60 1 d Using Field Installed Relay Duel Fuel Wiring Diagram Thermostat Envision Split LI Fei a E T LQu y2 Q t e i
7. Stage Y1 Y2 Dual Capacity Units The second stage compressor will be activated 5 seconds after receiving a Y2 input as long as the minimum first stage compressor run time of 1 minute has expired The ECM blower changes from medium to high speed 15 seconds after the Y2 input The Comfort Alert will delay the second stage compressor until 5 seconds after it receives a Y2 from the board Heat 3rd Stage Y1 Y2 W Dual Capacity Units The hot water pump is de energized which directs all heat to satisfy the thermostat The 1st stage of resistance heat is energized 10 seconds after W input and with continuous 3rd stage demand the additional stages of resistance heat engage sequentially every 5 minutes Emergency Heat W only The fan is started on high speed and the first stage of resistance heat is energized 10 seconds after the W input Continuing demand will engage the additional stages of resistance heat sequentially every 2 minutes Cooling Operation In all cooling operations the reversing valve directly tracks the O input Thus anytime the O input is present the reversing valve will be energized Cool 1st Stage Y1 O The blower motor and hot water pump are started immediately the loop pump s is energized 5 seconds after the Y1 input is received The compressor will be energized on low capacity for Dual Capacity units 10 seconds after the Y 1 input The ECM blower will shift from low to medium speed 15 secon
8. This lockout mode occurs when the normally closed safety Switch is opened momentarily set at 600 PSI Low Pressure This lockout mode occurs when the normally closed low pressure switch is opened for 30 continuous seconds set at 40 PSI A low pressure fault may also be indicated when a Comfort Alert lockout has occurred Freeze Sensing Water Flow This lockout mode occurs when the freeze thermistor temperature is at or below the selected freeze point well 30 F or loop 15 F for 30 continuous seconds 17 NS SPLIT INSTALLATION MANUAL Operation Logic Data HEATING OPERATION LOGIC STG1 STG2 STG3 DUAL CAPACITY UNITS Compesserte Compressor Hi Revae LoopPum O O O O Secondary 1 Out meg or or o on of or n ff ff n Secondary Out On ff ff T Stat Signal YL YZLW w vi 18 NS SPLIT INSTALLATION MANUAL DIP Switch Settings DIP SWITCH NUMBER DESCRIPTION OFF POSITION ON POSITION Service Test Mode Allows control of NORM or TEST opera tional modes Test mode accelerates most timing functions 16 times to allow faster troubleshooting Test mode also allows view ing the CURRENT status of the fault inputs on the LED display Freeze Sensing Setting Allows field selection of freeze thermistor fault sensing tempera Loop tures for well water 30 F or antifreeze protected 15 F earth Protection 15 F loops A
9. bubble solution to detect leaks on all connections made in the field Check the service valve ports and stem for leaks and all connections made in the field If a leak is found repair it and repeat the above steps For safety reasons do not pres surize the system above 150 psi Purge pressure from line set The system is now ready for evacuating and charging System Evacuation Ensure that the line set and air coil are evacuated before opening service valves to the split unit The line set must be evacuated to at least 200 microns to remove the moisture and air that may still be in the line set and coil Evacuate the sys tem through both service ports to prevent false readings on the gauge because of pressure drop through service ports Initial System Charge Calculation The Envision unit comes with a factory pre charge This volume is not sufficient to run the system Additional refrigerant must be added for the lineset This additional charge added to the factory pre charge of the Envision unit should be esti mated using the following equation Addition to Factory Charge lineset length x oz per ft 20 oz for accumulator The lineset charge should be calculated by multiplying the length times 0 5 oz ft for 3 8 liquid line and 1 0 oz ft for 1 2 liquid line in R 410A systems The suction line will not hold liquid and can be ignored for the calculation This should result in a slightly under charged unit exhibiting low subcooling and h
10. end of the hose to an open drain or outdoors 3 Close the cold water inlet valve to the water heater tank 4 Drain the tank by opening the valve on the bottom of the tank then open the pressure relief valve or hot water faucet 5 Flush the tank by opening the cold water inlet valve to the water heater to free the tank of sediments Close when draining water is clear 6 Disconnect the garden hose and remove the drain valve from the water heater 7 Referto Plumbing Installation and Desuperheater Startup on page 14 A CAUTION Elements will burn out if energized dry 13 NS SPLIT INSTALLATION MANUAL Plumbing Installation 1 oa9onuogssescom 11 12 0 Inspect the dip tube in the water heater cold inlet for a check valve If a check valve is present it must be removed or damage to the desuperheater circulator will occur Remove drain valve and fitting Thread the 3 4 inch NPT x 3 1 2 inch brass nipple into the water heater drain port Attach the center port of the 3 4 inch FPT tee to the opposite end of the brass nipple Attach the 1 2 inch copper to 3 4 inch NPT adaptor to the side of the tee closest to the unit Install the drain valve on the tee opposite the adaptor Run interconnecting tubing from the tee to DHW water out Cut the cold water IN line going to the water heater Insert the reducing solder tee in line with cold water IN line as shown Run interconnecting copper tubing between the unit DHW wate
11. open water control valves or loop pumps wired Condensate line open and correctly pitched Transformer switched to 208V if applicable DIP switches are set correctly DHW pump switch is OFF unless piping is completed and air has been purged Blower rotates freely Blower speed correct Air filter cleaner is clean and in position e Service access panels are in place e Return air temperature is between 50 80 F heating and 60 95 F cooling e Check air coil cleanliness to insure optimum performance Clean as needed according to maintenance guidelines To obtain maximum performance the air coil should be cleaned before startup A 10 percent solution of dishwasher detergent and water is recommended for both sides of coil a thorough water rinse should follow Startup Steps Notes Complete the Equipment Start Up Commissioning Check Sheet during this procedure Refer to thermostat operat ing instructions and complete the startup procedure Initiate a control signal to energize the blower motor Check blower operation Initiate a control signal to place the unit in the cooling mode Cooling setpoint must be set below room temperature First stage cooling will energize after a time delay Be sure that the compressor and water control valve or loop pump s are activated Verify that the water flow rate is correct by measuring the pressure drop through the heat exchanger using the P T plugs and comparing to unit capaci
12. steps above check properly replace unit control LED Definitions and Diagnostics Standard Microprocessor DIAGNOSTIC MODES NORMAL ED CURRENT DISPLAY MODE FAULT STATUS INPUTS OUTPUTS 1 OUTPUTS 2 swz sor swz ror Drain Pan Overflow Drain Bamov How Compressor Blower Lockout On or Low Low FP Thermistor Loop FP Thermistor Loop Compressor Blower 15 F Well lt 30 F lt 15 F Well lt 30 F On or High Medium Lockout Fees es EE EEE Y1 High High Pressure gt 600 Blower PSI Lockout High Pressure gt 600 Reversing Valve High Low Pressure Low Pressure lt 40 Low Pressure lt 40 G Fan Aux Heat 1 Current Sensor SL1 Deme uu jeeem 0 1 Refrigerant Systems To maintain sealed circuit integrity do not install service gauges unless unit operation appears abnormal Compare the change in temperature on the air side as well as the water side to the tables on pages 26 27 If the unit s performance is not within the ranges listed and the airflow and water flow are known to be correct gauges should then be installed and superheat and subcooling numbers calculated If superheat and subcooling are outside recommended ranges an adjust ment to the refrigerant charge may be necessary Notes Refrigerant tests must be made with desuperheater turned OFF Verify that air and water flow rates are at proper levels before servicing the refrigerant circuit 29 NS SPL
13. ENVISION Geothermal Water Source Outdoor Split Heat Pumps R 410A Refrigerant 2 3 4 5 6 Ton Dual Capacity Installation Information Water Piping Connections Desuperheater Connections Electrical Startup Procedures Troubleshooting Preventive Maintenance OCSE Gael ist iva PTA PERFORMANCE CERTIFIED ENERGY STAR s C usreo o Smarter from the Ground Up IM1615 07 08 Verano C Envision Series Outdoor Split Installation Manual WaterFurnace NS SPLIT INSTALLATION MANUAL Table of Contents Nomenclature 2 Physical Characteristics 2 General Installation Information 3 6 Electrical Data 7 Water Piping 8 Air Handler Nomenclature amp Coil Data 9 Line Set Sizing 9 Physical Data 10 Envision Coil Nomenclature 11 Refrigerant Coil Compatability 11 Heat Recovery Unit 12 14 Wiring Schematics 15 Microprocessor Controls 16 17 Operation Logic 18 DIP Switch Settings 19 Refrigeration 20 22 Pressure Temperature Conversion Chart 23 Unit Operating Parameters 24 Pressure Drop and Recommended Flow Rates 28 Unit Startup amp Troubleshooting 26 29 Preventive Maintenance 30 Replacement Procedures 30 Physical Dimensions 31 NS SPLIT INSTALLATION MANUAL Model Nomenclature 1 2 3 4 6 7 8 9 10 11 10 5 049 amp 10 amp 6 Model Type N Envision Coax Options C Copper Compressor Type N Cupronickel
14. IT INSTALLATION MANUAL Preventive Maintenance Water Coil Maintenance 1 Keep all air out of the water An open loop system should be checked to ensure that the well head is not allowing air to infiltrate the water line Lines should always be airtight 2 Keep the system under pressure at all times It is recommended in open loop systems that the water control valve be placed in the discharge line to prevent loss of pressure during off cycles Closed loop systems must have positive static pressure Notes On open loop systems if the installation is in an area with a known high mineral content 125 PPM or greater in the water it is best to establish with the owner a periodic maintenance schedule so the coil can be checked regularly Should periodic coil cleaning be necessary use standard coil cleaning procedures which are compatible with either the cupronickel or copper water lines Generally the more water flowing through the unit the less chance for scaling Other Maintenance Filters Filters must be clean to obtain maximum performance They should be inspected monthly under normal operating con ditions and be replaced when necessary Units should never be operated without a filter Condensate Drain In areas where airborne bacteria produce a slime in the drain pan it may be necessary to treat chemically to minimize the problem The condensate drain can pick up lint and dirt especially with dirty filters Inspect twice a year to avoi
15. TUH O36 MBTUH O48 MBTUH Coil 060 MBTUH Hydronic Models 060 MBTUH Note All Refrigerant Coils include TXV The encased coil cabinet is designed for upflow applications Refrigerant Coil Compatibility Single Dual Capacity Dual Capacity Airflow CFM NRACon Nszo NRAC026 NDZ026 NDSO26 D NmRAConp Nszo0 ngacose NRACORX NDZOS8 NDSOSB NRACO4S Nmco Nozo s NDSO4 Nmaco 0 nez Naaco Nbzo6a osoa Nmaco 0 Ns Nmaco 0 Nozoa NDS072 7 14 08 11 NS SPLIT INSTALLATION MANUAL Heat Recovery Unit for Domestic Hot Water Service valves have been provided inside the unit for connecting the discharge gas line to a water heating heat recov ery unit see figure 5 To make the connections close the service valves inside the unit by turning clockwise Using a recovery canister connect to either of the schrader ports on the DSH service valves and recover the small amount of refrig erant trapped inside of the U tube Prior to brazing ensure that all refrigerant has been removed from U tube Once the refrigerant is removed it is recommended that the tube be cut at the U to remove any excess oil that may be trapped This will also allow for easier removal of the tubing with a tor
16. allation of equipment may result in undesirable noise levels in the living areas Figure 1 Typical Split System Application Remote Blower Coil Disconnect Insulated Suction Line Lineset To Air Handler e N ll Handler Maximum Recommended Distance is 50 Between Units Condensate Drain must be trapped NS SPLIT INSTALLATION MANUAL General Installation Information cont Dual Fuel Systems Envision units can be connected to fossil fuel furnaces that include an A coil or slab coil Dual fuel installations utilize the Envision heat pump for heating until the point that auxiliary heat is called for on the thermostat At that point the furnace will be enabled and the heat pump will be disabled The Envision heat pump provides air conditioning through the furnace s refrigerant coils Refer to the furnace manufacturer s installation manual for the furnace installation wiring and coil insertion A WaterFurnace Dual Fuel thermostat a field installed DPST relay or dual capacity auxiliary heat relay is required See Figure 2 for typical Dual Fuel application In add on Envision Split applications the coil should be located in the supply side of the furnace to avoid condensation damage to the furnace heat exchanger A high temperature limit should be installed upstream of the coil to de energize the compressor whenever the furnace is operating Without this switch the Envision Split will trip out on high pre
17. at exchanger Closed Loop Earth coupled Systems Outdoor Installations Locate unit on an air pad with access hole as shown below When mounting on an existing concrete pad holes must be bored through to accommodate 1 1 4 inch P E pipe with 1 2 inch insulation Connecting To Earth Loop The earth loop trench should be continued directly under the unit as shown in Figure 3 Make the connections to op tional fittings from the loop circulator pump s and insure proper backfill to support the loop pipe during trench settling All 1 1 4 inch piping should be insulated with a minimum of 1 2 inch closed cell insulation from below the ground surface to the loop circulator circulator pump if loop temperature drops below 20 F Loop freeze protection should also be maintained IMPORTANT A freeze protection thermostat is installed in the unit to automatically start loop to the lowest temperature the insulated loop may encounter in the case of power failure Flow Center Installation Figure 3 Typical Split System Outdoor Installation Using Flow centers FC1 GL or FC2 GL as needed may be Closed Loop internally mounted on the NDS splits Two stub tubes with barbs are pre connected to the coax Two tubes with brass fittings to adapt to the flow center 2 hoses to connect between the two sets of tubes and four hose clamps are in cluded with each NDS unit The brass adapter fittings have plastic swivel connectors and are also internally threade
18. ater Flow Suction Discharge GPM Ton Pressure Pressure Superheat Subcooling PSIG Water Temp Air Temp Rise F DB Second Stage Operation Cooling No Desuperheater Entering Water Water Flow Suction Discharge Water Temp Air Temp Temp F GPM Ton Pressure Pressure Superheat Subcooling Drop F DB PSIG PSIG p 3 0 115 130 200 220 10 16 3 11 8 12 17 23 3 0 118 133 255 285 9 15 5 12 9 13 17 23 so sow su re es va 3 0 123 140 310 340 8 14 7 15 8 12 17 23 Heating No Desuperheater Entering Water Water Flow Suction Discharge Temp F GPM Ton Pressure Pressure Superheat Subcooling Water Temp PSIG PSIG 3 0 76 85 285 335 6 12 10 20 3 7 14 18 3 0 105 120 310 375 6 12 6 18 5 9 20 24 3 0 138 152 345 405 7 14 4 15 6 10 22 30 Note Cooling performance based on entering air temperatures of 80 F DB 67 F WB Heating performance based on entering air temperature of 70 F DB 24 NS SPLIT INSTALLATION MANUAL Pressure Drop and Recommended Flow Rates Dual Capacity Pressure Drop psi 30 F 50 F 70 F 90 F 110 F Model GPM 5 30 06 25 NS SPLIT INSTALLATION MANUAL Unit Startup Before Powering Unit Check The Following e High voltage is correct and matches nameplate Fuses breakers and wire size correct Low voltage wiring complete Piping completed and water system cleaned and flushed Airis purged from closed loop system e Isolation valves are
19. ating and air conditioning equipment Untrained personnel can perform the basic maintenance functions of cleaning coils and cleaning and replacing filters All other operations should be performed by trained service personnel When working on heating and air conditioning equipment observe precautions in the literature tags and labels attached to the unit and other safety precautions that may apply such as the following safety measures Follow all safety codes e Wear safety glasses and work gloves e Use a quenching cloth for brazing operations Have a fire extinguisher available for all brazing operations Moving and Storage Move units in the normal up orientation Units may be moved and stored per the information on the packaging Do not stack more than three units in total height Do not attempt to move units while stacked When the equipment is received all items should be carefully checked against the bill of lading to be sure all crates and cartons have been received Examine units for shipping damage removing the units from the packaging if necessary Units in question should also be internally inspected If any damage is noted the carrier should make the proper notation on the delivery receipt acknowledging the damage Split Unit Location Locate the split compressor section away from areas that may disturb the customer and in a way that allows easy re moval of the access panels and the top of the cabinet Provide suffic
20. aximize the benefits of the heat recovery a minimum 50 gallon water heater is recommended For higher demand applications use an 80 gallon water heater or two 50 gallon water heaters connected in a series as shown below Electric water heaters are recommended Make sure all local electrical and plumbing codes are followed when installing a heat recovery Note Under certain conditions Envision dual capacity units operate with very low refrigerant discharge temperatures producing little or no water heating capability This scenario occurs when the unit is operating with cold entering source water loop or well Allowing the pump to operate during these conditions actually removes heat from the DHW 01 culating through the unit To overcome this Envision unit microprocessors have been programmed to disengage the desuperheater pump during such conditions During low capacity cooling operation the pump will operate only if the DHW temperature entering the unit is less than the liquid line temperature plus 35 F During high capacity cooling op eration the pump will operate only if the DHW temperature is less than the liquid line temperature plus 60 Using a preheat tank as shown in Figure 11 will maximize desuperheater capabilities Water Tank Preparation To install a unit with desuperheater follow these installation guidelines 1 Turn off the power to the water heater Attach a water hose to the water tank drain connection and run the other
21. c cs v o i Gry 9 Reversing Valve Va o Do 3A Fossil Fuel L Fuse Furnace ET c Common c Org 14 Brn 15 Q Tam var 4 O Bu 7 Pink 13 NE EE EM D w a 240V L1 cl lo Fused L2 Fused L2 240V12 240v L2 O Auxiliary Heat Relay 5 s F1 10A 240V Fan Q Ausili Down Heat Relay No No NO Q Q Nc NO Q Q NC 6 L F1 10A ne 240V Auxiliary Heat Relay COM COM e e CR1 CR2 Note Field installed DPST dual fuel relay CR3 COM CR4 COM Required for dual fuel installation ze _ Comfort R Yel 6 chassis C 8K 5 Y2 O Alert yL wa R CCHI 9 O Violet 3 Lx ec ies O ce zi x P6 Legend ni e 8 Factory Low voltage wiring Bk t L_O CC GND 13 gt Factory Line voltage wiring J Field low voltage wiring 7 Field line voltage wiring PI 4 A te pus i Optional block R F1 5 gt DC Voltage PCB traces c b2 Q e Internal junction Y 14 gt O Quick connect terminal va Ra Premier 2 gt LU f 12 v Fa Microprocessor 2 2 A Wire nut w Ps5 Logic Control oD u Field wire lug la o pe DC Voltage oP 5 de Mind ch 7 9 gt Z ET H y Relay Contacts LO Pe 2 gt N O N C 1 gt ev Fuse P2 gt Shut 11 gt eo Thermistor ia 1 Mohr rtt 6D ol Light emitting diode Green NOTE 6 2e E Settings Lp Relay coll legal SII SLi In 4 id mE Capacitor w bleed resistor n aL SW On sw On SW3 Qn np Tel Ir Comi A bio p u gt
22. ccessory Relay Allows field selection of the accessory relay to operate with the compressor or fan NOT USED NOT USED Input Diagnostics Allows viewing the inputs from the thermo stat to the control board such as Y1 Y2 O W SL1 In on the LED display Diagnostic Inputs viewed at LEDs Output Diagnostics Allows viewing the outputs from the control Diagnostic board such as the compressor reversing valve blower hot water Outputs viewed at pump and loop pump on the LED display LEDs Thermostat Selection Configures the control for a pulsed lockout signal ComforTalk and FaultFlash thermostats or continuous 5 VAC lockout signal Pulsed L signal Single or Dual Capacity Operation Dual Cap Well Protection 30 F Normal Display viewed at LEDs Normal Display viewed at LEDs Continuous L signal 1 Speed Zoned Finish on Second Stage This switch allows the unit to down stage with the thermostat when off and finish with second stage when on Finish on second stage reduces stage changing in reciprocating dual capacity compressors Normal All other systems Finish on 2nd Unzoned Dual Capacity E Series or Premier 2 speed ECM Fan Monitoring Set for No PRM on split systems RPM NOT USED N A On dual capacity units this switch allows stage change on the fly when off and 1 minute delay when on A delay is required on all Envision reciprocating dual capacity units 19
23. ch since each section can be removed independently Ser vice valves must be protected to prevent overheating Unbraze the 1 2 inch O D U tube and run tubing from the left hand service valve to the inlet of the heat recovery unit and from the outlet of the heat recovery unit to the right hand of the service valve Typically the one way discharge line length should be limited to 25 30 feet and line size must be increased depending on unit size and length of run Follow the instructions supplied with the heat recovery unit for mounting location water piping and start up A typical installation is shown below IMPORTANT Reopen discharge line service valves before starting up unit but only after leak checking purging and evacuating new discharge line Figure 5 Service Valves for Heat Recovery Unit Connections To Compressor Heat Recovery Unitn Maximum One Way Line Length From size 1 2 OD 5 8 OD 3 4 OD Heat Recovery Reversing 026 038 Up to 9 ft Up to 25 ft Up to 30 ft Valve 049 Upto5ft Upto 13ft Up to 30 ft oa na Uptoon upwozsi Upto6f 01 201 Figure 6 Typical Hot Water Piping Layout Cold Hot Venting Waste Valve or Vent Coupling P T Relief Valve Insulated Line set With UV Paint To Air handler Add on Hot Water Generator with Internal Pump Drain Valve Pipe Tee 12 NS SPLIT INSTALLATION MANUAL Heat Recovery Connections To m
24. d the possibility of overflow Blower Motors Blower motors on most air handlers are equipped with sealed ball bearings and require no periodic oiling Desuperheater Coil See Water Coil Maintenance section above Air Coil The air coil must be cleaned to obtain maximum performance Check once a year under normal operating conditions and if dirty brush or vacuum clean Care must be taken not to damage the aluminum fins while cleaning A CAUTION Fin edges are sharp Replacement Procedures Obtaining Parts When ordering service or replacement parts refer to the model number and serial number of the unit as stamped on the serial plate attached to the unit If replacement parts are required mention the date of installation of the unit and the date of failure along with an explanation of the malfunctions and a description of the replacement parts required In Warranty Material Return Material may not be returned except by permission of authorized warranty personnel Contact your local distributor for warranty return authorization and assistance 30 NS SPLIT INSTALLATION MANUAL Physical Dimensions Cabinet Dimensions and Refrigerant Piping Connections Top View pee Front View Connection Point for Field Installed Heat Recovery Unit Rear View Suction Line E Connection G Liquid Line Lineset c
25. d to accept 1 NPT fittings NOTE For ease of installation attach provided hoses to C coax first and then trim to fit to elbows on flow center o e le Loop Supply and Return Piping NS SPLIT INSTALLATION MANUAL Air Handler Nomenclature NAH 036 A O 0 1 R Pal Model Type Air Coil LA NAH Envision Air Handler R Refrigerant H Hydronic Unit Capacity gt Refrigerant Models Nom CFM Motor D 022 MBTUH 800 1 ECM 208 230 60 1 cem 026 MBTUH 925 O30 MBTUH 980 036 MBTUH 1225 042 MBTUH 1425 LL Disconnect O48 MBTUH 1625 O No breaker installed available on 5kW amp 10kW heaters 060 MBTUH 1760 17 Breaker installed available on 15kW amp 20kW heaters Hydronic Models 026 MBTUH 925 e 036 MBTUH 1225 H Electric Heat LJ 048 MBTUH 1625 OO No electric heat 060 MBTUH 1760 05 5 kW available on 022 036 10 10 kW available on 030 060 Vintage 15 15 kW available on 042 060 A Current 20 20 kW available on O60 only e ie 5 te Air Handler Coil Data Envision Matching Air Coil Surface FPI Rows Tube Split Model Handler Area sq ft Diameter Line Set Sizes Factory Suction Suction Suction Charge 02 NDS026 NAH026 5 8 OD 3 8 OD 3 4 OD 3 8 OD 3 4 OD 1 2 OD NDS038 NAH036 5 8 OD 3 8 OD 3 4 OD 3 8 OD 3 4 OD 1 2 OD NDS049 NAH048 3 4 OD 3 8 OD 7 8 OD 3 8 OD 7 8 OD 1 2 OD NDS064 NAHO60 7 8 OD 1 2
26. ds after the Y 1 input 85 of medium speed if in dehumidification mode Cool 2nd Stage Y1 Y2 O Dual Capacity Units The second stage compressor will be activated 5 seconds after receiving a Y2 input as long as the minimum first stage compressor run time of 1 minute has expired The ECM blower changes to high speed 15 seconds after the Y2 input 8596 of 16 NS SPLIT INSTALLATION MANUAL Microprocessor Control cont high speed if in dehumidification mode The Comfort Alert will delay the second stage compressor until 5 seconds after it receives a Y2 from the board Fan G only The fan starts on low speed PSC ON Regardless of fan input G from thermostat the fan will remain on low speed for 30 seconds at the end of each heating cooling or emergency heat cycle Lockout Conditions During lockout mode the appropriate unit and thermostat lockout LEDs will illuminate The compressor loop pump hot water pump and accessory outputs are de energized The fan will continue to run on low speed If the thermostat calls for heating emergency heat operation will occur Comfort Alert lockouts cannot be reset at the thermostat All other lockout modes can be reset at the thermostat after turning the unit off then on which restores normal operation but keeps the unit lockout LED illuminated Interruption of power to the unit will reset a lockout without a waiting period and clear all lockout LEDs High Pressure
27. e coil installation instructions shown in Figure 14 Nitrogen should be bled through the system at 2 to 3 PSI to prevent oxidation inside the refrigerant tubing Use a low silver phos copper braze alloy on all brazed connections Braze line set to the service valve stubs on the Figure 13 Typical Split System Refrigerant Line Connections inside front of the split cabinet as shown in Figure 13 Nitrogen should be bled through the system at 2 to 3 PSI to prevent oxidation contamination Use a low silver phos copper braze alloy on all brazed connections Envision split units are shipped with a factory charge and service valves are not to be opened until the line set has been leak tested purged and evacuated Schrader cores should be removed before brazing A heat sink should be used on the service valves and TXV to prevent damage caused by excessive heat Service ports for attaching refrigerant gauges Insulated Suction Line Replace caps after opening system Connection 20 NS SPLIT INSTALLATION MANUAL Refrigeration continued Leak Testing The refrigeration line set must be pressurized and checked for leaks before purging and charging the unit To pressurize the line set attach refrigerant gauges to the service ports and add an inert gas nitrogen or dry carbon dioxide until pres sure reaches 60 to 90 PSIG Never use oxygen or acetylene to pressure test Use an electronic leak detector or a good quality
28. elay is employed before the compressor is energized Component Sequencing Delays Components are sequenced and delayed for optimum space conditioning performance Accessory Relay An accessory relay on the control board allows for field connection of solenoid valves electronic air cleaners etc The accessory relay has a normally open output and a normally closed output Short Cycle Protection The control employs a minimum off time of four minutes to provide for short cycle protection of the compressor Shutdown Mode A 24VAC common signal to the shutdown input on the control board puts the unit into shutdown mode Compressor hot water pump and fan operation are suspended Safety Controls The Envision control receives separate signals for a high pressure switch for safety a low pressure switch to prevent loss of charge damage and a low suction temperature thermistor for freeze sensing Upon a continuous 30 second measurement of the fault immediate for high pressure compressor operation is suspended the appropriate lockout LED begins flashing Refer to the Fault Retry section below Testing The Envision control allows service personnel to shorten most timing delays for faster diagnostics Refer to the Field Selection DIP switch SW2 1 on page 21 Fault Retry All faults are retried twice before finally locking the unit out An output signal is made available for a fault LED at the thermostat The fault retry feat
29. eplace the access cover and restore electrical supply to the water heater Make sure that any valves in the desuperheater water circulating circuit are open Turn on the unit to first stage heating The DHW pump should be running When the pump is first started open the inspection port 1 turn if equipped until water dribbles out then replace Allow the pump to run for at least five minutes to ensure that water has filled the circulator properly Be sure the switch for the DHW pump SW4 is ON The DHW OFF LED on the unit should not be illuminated The temperature difference between the water entering and leaving the desuperheater should be 5 F to 15 F The water flow should be approximately 0 4 GPM per ton of nominal cooling Allow the unit to heat water for 15 to 20 minutes to be sure operation is normal CAUTION Never operate the DHW circulating pump while dry If the unit is placed in operation before the desuperheater piping is connected be sure that the pump switch is set to the OFF position 14 NS SPLIT INSTALLATION MANUAL Wiring Schematics Envision Series Dual Capacity Split Wiring Schematic 208 230 60 1 Notes 1 24V Accessory relay see SW2 3 for description of operation 2 This Switch allows the unit to down stage with the t stat when OFF and finish on second stage when ON Finish second stage reduces stage changing in recip dual capacity compressors and should be ON for unzoned Dual Cap E
30. g mode and set temperature to maintain desired comfort level 18 Instruct the owner operator in the proper operation of the thermostat and system maintenance Notes Be certain to fill out and forward all warranty registration papers Final Evaluation After the initial check of superheat subcooling values in the heating mode shut off the unit and allow it to sit 3 to 5 minutes until pressures equalize Restart the unit in the cooling mode and check the values against those in tables on page 24 If the unit performs satisfactorily charging is complete If the unit does not perform to specifications the charge may need to be readjusted until the values are close Adding refrigerant will increase subcooling Recovering some of the refrigerant will decrease subcooling and increase superheat If the superheat subcooling values are still not close to the specifications in tables on page 24 analyze refrigerant circuit operation 27 NS SPLIT INSTALLATION MANUAL Unit Startup Troubleshooting Heating Cycle Analysis Measure suction temperature here at TXV bulb in heating modes Measure suction temperature here at TXV bulb in Suct PSI ___ cooling modes Suct sat temp Sucttemp Super heat Lineset gt length Suction Air Comp Coil Bi flow CIgTXV filter drier Discharge Discharge PSI Measure liquid line Disch sat temp temperature and Liquid temp COOLING TXV ACTIVE pressure here in Sub cooling RIGHT TO LEFT bo
31. he schrader connection on the liquid line service valve 3 Convert the pressure obtained in Step 2 to the saturation temperature by using the R 410A Pressure Temperature Conversion Chart on page 23 4 Subtract the temperature in Step 1 from the temperature in Step 3 The difference will be the subcooling value for that unit Refer to the tables on page 24 for subcooling ranges at specific enter water conditions 22 NS SPLIT INSTALLATION MANUAL Pressure Temperature Coversion Chart for R 410A PRESSURE TEMP PRESSURE TEMP PRESSURE TEMP PRESSURE PRESSURE TEMP PSIG F PSIG F PSIG F PSIG PSIG F 60 8 5 62 9 9 63 5 96 3 64 2 96 8 64 8 97 2 65 5 97 7 66 1 98 1 66 8 98 6 67 4 99 0 68 0 99 5 68 7 99 9 69 3 69 9 70 5 71 1 71 7 72 3 72 9 73 5 74 1 74 7 75 3 75 8 76 4 77 0 77 5 78 1 78 7 79 2 79 8 80 3 80 9 81 4 81 9 82 5 83 0 83 5 84 1 84 6 85 1 85 6 86 1 86 6 87 1 87 7 88 2 88 7 89 2 89 6 23 NS SPLIT INSTALLATION MANUAL Unit Operating Parameters Dual Capacity Models First Stage Operation Cooling No Desuperheater Entering Water Water Flow Suction Discharge Temp F GPM Ton Pressure Pressure Superheat Subcooling PSIG PSIG DB 3 0 120 135 190 210 9 15 3 10 8 12 17 23 3 0 126 143 230 250 9 18 5 11 9 13 17 23 30 Gee woso si rs se ona 3 0 136 148 300 330 8 14 7 14 8 12 17 23 Heating No Desuperheater Entering Water W
32. ient room to make water electrical and refrigerant line connections and allow space for service personnel to perform maintenance The NS split is approved for outdoor installation when properly installed Air Coil Location Refer to the air handler manufacturer s instructions for the blower coil unit for details on installing the air handling portion of the system Condensate Drain Follow the blower coil manufacturer s instructions Duct System All blower coil units air coils must be installed as specified by the manufacturer s installation instructions however the following recommendations should considered to minimize noise and service problems An air filter must always be installed upstream of the air coil on the return air side of the air handler or furnace If there is limited access to the filter rack for normal maintenance it is suggested that a return air filter grill be installed Be sure that the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the filter and plugging the air Coil In applications using galvanized metal ductwork a flexible duct connector is recommended on both the supply and return air plenums to minimize vibration from the blower To maximize sound attenuation of the unit blower the supply and return plenums should include an internal duct liner of 1 inch thick glass fiber or be constructed of ductboard Insulation is usually not installed in the supply branch ducts Duc
33. igh superheat As charge is added the subcooling should rise and the superheat should fall until 8 16 degrees of superheat is reached when the TXV should be metering the system See operating details in the startup section of this manual for exact superheat and subcooling values Example 038 with 40 foot of 3 8 liquid line Additional to be added 40 ft x 0 5 oz ft 20 oz for accumulator 40 oz Solution 40 oz should be added to the existing 56 oz of factory charge as an initial charge Charging the System Charge Method After purging and evacuating the line set fully open the service valves counterclockwise Add R 410A liquid into the liquid line service port until the pressure in the system reaches approximately 200 PSIG Never add liquid refrigerant into the suction side of a compressor Start the unit and measure superheat and subcooling Keep adding refrig erant until the unit meets the superheat and subcooling values on page 24 Checking Superheat and Subcooling Determining Superheat 1 Measure the temperature of the suction line at the point where the expansion valve bulb is clamped 2 Determine the suction pressure in the suction line by attaching refrigeration gauges to the schrader connection on the suction side of the compressor 3 Convert the pressure obtained in Step 2 to the saturation temperature by using the R 410A Pressure Temperature Con version Chart on page 23 4 Subtract the temperature obtained in S
34. mostat Wiring for Dual Fuel Applications Thermostat Envision Split Thermostat Envision Split Q 4st Stage Compressor i Or At Ast Stage Compressor Ay ys Q vi Y2 2nd Stage Compressor Q Qi Q v2 0 Reversing Valve HH Dina o ossil Fuel L A P1 Air Handler Bg Furnace QD ML Fault Signal tre hi QD Lo c Q Common Common Q C R Q 24VAC w G Fan p 1 RC RR B QD Auxiliary O Y w Heat Relay 4 t Auxiliary Heat Relay Air Handler transformer must be at least 75 VA Note Field installed DPST dual fuel relay Required for dual fuel installation 3 7 chassis NS SPLIT INSTALLATION MANUAL Water Piping Residential NS split units are supplied standard with brass water connections which will connect to flow center CAUTION Never use flexible hoses smaller than 1 inch inside diameter on the unit and limit hose length to 10 feet per connection Check carefully for water leaks A CAUTION Water piping exposed to outside temperatures may be subject to freezing Water Piping The proper water flow must be provided to each unit whenever the unit operates To assure proper flow use pressure temperature ports to determine the flow rate These ports should be located at the supply and return water connections on the unit The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant to water he
35. nded that a new R 410A air handler be installed with an Envision Split considering the long term benefits of reliability warranty etc versus the short term installation cost savings However the existing air handler may be retained provided the following e Coil currently is R 410A rated Coil uses a TXV No capillary or fixed orifice systems should be used Alife expectancy of more than 7 years remaining for the air handler and components NS SPLIT INSTALLATION MANUAL General Installation Information cont Connection to Air Coil Figures 1 and 2 illustrate typical Envision Split installations The table on page 9 shows typical lineset diameters and maximum length Linesets over 60 feet are not recommended If the lineset is kinked or deformed and cannot be reformed the bad section of pipe should be replaced A restricted lineset will affect unit performance As in all R 410A equipment a reversible liquid line filter drier is required to insure all moisture is removed from the system This drier should be replaced whenever breaking into the system for service All linesets should be insulated with a minimum of 1 2 closed cell insula tion All exterior insulation should be painted with UV resistant paint or covering to insure long insulation life Air Handler Installation Air handlers used with dual capacity units must be capable of operating with a minimum of 2 blower speeds Refer to the manufacturer s instructions for the blowe
36. onnections are braze type Connection internally mounted Side View PHYSICAL DIMENSIONS MOL A Bc DT ET Fh GT HT KK ot ML NS026 thru NS072 60 23 9 25 7 9 3 7 1 90 56 82 10 7 189 87 148 70 T Notes Refer to Physical Dimensions and Piping Connections drawings Inches cm 31 Installation Notes Smarter from the Ground Up Manufactured by WaterFurnace International Inc 9000 Conservation Way Fort Wayne IN 46809 www waterfurnace com 1M1615 07 08 Product Envision Series NS Outdoor Split Type Geothermal Water Source Heat Pumps Size 2 6 Tons Document Installation Manual WaterFurnace Renewable Energy has a policy of continuous product research and development and reserves the right to change design and specifications without notice 2008 WRE
37. r IN and the tee 1 2 inch nominal The recommended maximum distance is 50 feet To prevent air entrapment in the system install a vent coupling at the highest point of the interconnecting lines Insulate all exposed surfaces of both connecting water lines with 3 8 inch wall closed cell insulation Note All plumbing and piping connections must comply with local plumbing codes Heat Recovery Startup Oo omma D 12 13 Close the drain valve to the water heater Open the cold water supply to the tank Open a hot water faucet in the building to bleed air from the system Close when full Open the pressure relief valve to bleed any remaining air from the tank then close If so equipped unscrew the indicator plug 1 turn on the motor end of the pump until all air is purged from the pump then tighten the plug Use vent couplings to bleed air from the lines Carefully inspect all plumbing for water leaks and correct as required Before restoring electrical supply to the water heater adjust the temperature setting on the tank e On tanks with both upper and lower elements the lower element should be turned down to the lowest setting approximately 100 F The upper element should be adjusted to 120 F to 130 F Depending upon the specific needs of the customer you may want to adjust the upper element differently e On tanks with a single element lower the thermostat setting to 120 F After the thermostat s is adjusted r
38. r coil unit for details on installing the air handling portion of the system All blower coil units air coils must be installed as specified by the manufacturer s installations instructions However the following rec ommendations should be considered to minimize noise and service problems An air filter must always be installed upstream of the air coil on the return air side of the air handler of furnace If there is limited access to the filter rack for normal maintenance it is suggested that a return air filter grille be installed Be sure that the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the filter and plugging the air Coil Ensure that the line set size is appropriate to the capacity of the unit refer to page 9 Line sets should be routed as di rectly as possible avoiding unnecessary bends or turns All wall penetrations should be sealed properly Line set should not come into direct contact with water pipes floor joists wall studs duct work floors walls and brick Line set should not be suspended from joists or studs with a rigid wire or strap which comes into direct contact with the tubing Wide hanger strips which conform to the shape of the tubing are recommended Isolate hanger straps from line set insulation by using metal sleeves bent to conform to the shape of insulation Line set insulation should be pliable and should completely surround the refrigerant line Notes Improper inst
39. ssure A dual fuel thermostat can remove the Y1 and Y2 calls when a W call is energized to allow gas furnace backup on an Envision Split application Refer to thermostat wiring on page 15 for details Figure 2 Typical Split System Heat Pump Coil Add On Fossil Fuel Furnace Disconnect Supply Duct Slab Coil Insulated Suction Line Wire To Thermostat Condensate Drain st be trapped Up Flow Fossil Fuel Furnace Lineset To Air Handler Thermostat Wire From Furnace NS SPLIT INSTALLATION MANUAL Electrical General Be sure the available power is the same voltage and phase as that shown on the unit serial plate Line and low voltage wiring must be done in accordance with local codes or the National Electric Code whichever is applicable See unit electri cal data for fuse or cicuit breaker sizing information Electrical Data Rated Voltage Compressor Voltage Min Max FLA Amp HACR 026 208 230601 197 253 520 04 54 169 785 _038__ 206 250 60 1 _197 253 620 04 54 224 265 049 _ 206 230 60 1 _197 253 o 04 54 269 322 064 208 2306071 1971253 1180 0 4 5 4 208 230 60 1 197 253 Rated Voltage of 208 230 60 1 Rev 02 20 07 HACR circuit breaker in USA only Min Max Voltage of 197 253 All fuses Class RK 5 Thermostat Wiring Figure 12a Thermostat Wiring Figure 12b Ther
40. tep 3 from Step 1 The difference is the amount of superheat for the unit Refer to tables on page 24 for superheat ranges at specific entering water conditions Superheat Adjustment TXV s are factory set to a specific superheat however the superheat should be adjusted for the application To adjust the TXV to other superheat settings 1 Remove the seal cap from the bottom of the valve 2 Turn the adjustment screw clockwise to increase superheat and counterclockwise to decrease superheat One complete 360 turn changes the superheat approximately 3 4 F regardless of refrigerant type You may need to allow as much as 30 minutes after the adjustment is made for the system to stabilize 21 NS SPLIT INSTALLATION MANUAL Refrigeration continued 1 Once the proper superheat setting has been achieved replace and tighten the seal cap Warning There are 8 total 360 turns on the superheat adjustment stem from wide open to fully closed When adjusting the superheat stem clockwise superheat increase and the stop is reached any further clockwise turning adjustment will damage the valve Determining Subcooling 1 Measure the temperature of the liquid line on the small refrigerant line liquid line just outside the split cabinet This location will be adequate for measurement in both modes unless a significant temperature drop in the liquid line is anticipated 2 Measure the liquid line pressure by attaching refrigerant gauges to t
41. th heating and cooling modes HEATING TXV ACTIVE LEFT TO RIGHT Heat of Extraction Rejection GPM x 500 485 for water antifreeze x AT Note DO NOT hook up pressure gauges unless there appears to be a performance problem Measure suction temperature Cooling Cycle Analysis here at TXV bulb in heating modes Measure suction temperature here at TXV bulb in Suct PSI cooling modes Suct sat temp Suct temp Super heat A Lineset gt length Suction Air Comp Coil heater A Discharge PSI d Discharge CIgTXV filter drier COOLING TXV ACTIVE RIGHT TO LEFT Measure liquid line temperature and pressure here in both heating and cooling modes Disch sat temp Liquid temp Sub cooling HEATING TXV ACTIVE LEFT TO RIGHT NS SPLIT INSTALLATION MANUAL Troubleshooting Standard Microprocessor Controls To check the unit control board for proper operation 1 Disconnect thermostat wires at the control board 2 Jumper the desired test input Y1 Y2 W O or G to the R terminal to simulate a thermostat signal 3 If control functions properly e Check for thermostat and field control wiring use the diagnostic inputs mode 4 If control responds improperly Ensure that component being controlled is functioning compressor blower reversing valve etc Ensure that wiring from control to the component is functioning refer to the LED Definition table below and use the diagnostic outputs mode e If
42. ts in unconditioned areas should be wrapped with a minimum of 1 inch duct insulation Application of the unit to uninsulated ductwork in an unconditioned space is not recommended as the unit s performance will be adversely affected If the air handler is connected to existing ductwork a previous check should have 3 NS SPLIT INSTALLATION MANUAL General Installation Information cont been made to assure that the duct system has the capacity to handle the air required for the unit application If ducting is too small as in replacement of heating only systems larger ductwork should be installed All existing ductwork should be checked for leaks and repairs made accordingly The duct systems and diffusers should be sized to handle the design airflow quietly If air noise or excessive airflow is a problem the blower speed can be changed to a lower speed to reduce airflow This will reduce the performance of the unit slightly in heating however it will increase the temperature rise across the air coil Airflow must still meet minimum requirements Equipment Selection The following guidelines should be used when mating an Envision Split to an air handler coil e Select R 410A components only e Match the air handler to the air handler coil data table ndoor matching adjustable TXV is factory installed on every air handler coil Fixed orifice or cap tube systems should not be used Utilizing Existing Coil or Air Handler It is recomme
43. ty data in specification catalog Check the temperature of both the supply and discharge water see page 24 Check for an air temperature drop of 15 F to 25 F across the air coil depending on the fan speed and entering water temperature 8 Decrease the cooling set point several degrees and verify high speed blower operation 9 Adjust the cooling setpoint above the room temperature and verify that the compressor and water valve or loop pumps deactivate 10 Initiate a control signal to place the unit in the heating mode Heating set point must be set above room temperature 11 First stage heating will energize after a time delay 12 Check the temperature of both the supply and discharge water see page 24 13 Check for an air temperature rise of 20 F to 35 F across the air coil depending on the fan speed and entering water temperature 14 If auxiliary electric heaters are installed increase the heating setpoint until the electric heat banks are sequenced on All stages of the auxiliary heater should be sequenced on when the thermostat is in the Emergency Heat mode Check amperage of each element a 8 D gt NO 26 NS SPLIT INSTALLATION MANUAL 15 Adjust the heating setpoint below room temperature and verify that the compressor and water valve or loop pumps deactivate 16 During all testing check for excessive vibration noise or water leaks Correct or repair as required 17 Set system to desired normal operatin
44. ure is designed to prevent nuisance service calls Diagnostics The Envision control board allows all inputs and outputs to be displayed on the LEDs for fast and simple control board diagnosis Refer to the Field Selection DIP Switch SW2 1 on page 21 Hot Water High Limit Domestic Hot Water Option This mode occurs when the hot water input temperature is at or above 130 F for 30 continuous seconds The DHW limit status LED on the unit illuminates and the hot water pump de energizes Hot water pump operations resume on the next compressor cycle or after 15 minutes of continuous compressor operation during the current thermostat demand cycle Hot Water Justification Since compressor hot gas temperature is dependant on loop temperature in cooling mode loop temperatures may be too low to allow proper heating of water The control will monitor water and refrigerant temperatures to determine if conditions are satisfactory for heating water The DHW limit status LED on the unit illuminates when conditions are not favorable for heating water Heating Operation Heat 1st Stage Y1 The fan motor is started on low speed immediately PSC ON the loop pump is energized 5 seconds after the Y 1 input is received and the compressor is energized on low capacity 10 seconds after the Y 1 input The fan is switched to medium speed 15 seconds after Y 1 input ECM only The hot water pump is cycled 30 seconds after the Y 1 input Heat 2nd
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