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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
™
IM1615 07/08
WaterFurnace
Envision Series Outdoor Split Installation Manual
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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 & 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 Parameter
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NS SPLIT INSTALLATION MANUAL Model Nomenclature 1 2 3 4-6 7 8 9 10 11 N D S 049 A 1 0 A C Model Type N = Envision Coax Options C = Copper Compressor Type N = Cupronickel 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 52 56 90 92 104 Factory Charge R410a, oz [kg] [1.47] [1.59] [2.55
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NS SPLIT INSTALLATION MANUAL General Installation Information Safety Considerations WARNING: Before performing service or maintenance operations on a system, turn off main power 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 instal
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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
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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
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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 t
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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 HWA Ext Total Min Max Rated Voltage Compressor Pump Loop Unit Circ Fuse/ Model Voltage Min/Max MCC RLA LRA FLA FLA FLA Amp HACR 026 2
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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. 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. T
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NS SPLIT INSTALLATION MANUAL Air Handler Nomenclature Air Handler Coil Data Line Set Sizes 20 feet 40 feet 60 feet Unit Air Factory Size Handler Charge (oz.) Suction Liquid Suction Liquid Suction Liquid NDS026 NAH026 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 52 NDS038 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56
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NS SPLIT INSTALLATION MANUAL Physical Data 10
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NS SPLIT INSTALLATION MANUAL Envision Coil Nomenclature Refrigerant Coil Compatibility Indoor Split Model Indoor Split Model Outdoor Split Model Recommended Encased/Uncased Coil (Single) (Dual Capacity) (Dual Capacity) Airflow (CFM) NRAC026* NSZ022 - 800 NRAC026* - NDZ026 NDS026 925 NRAC026* NSZ030 - - 980 NRAC036* NSZ036 - - 1225 NRAC036* - NDZ038 NDS038 1225 NRAC048* NSZ042 - - 1425 NRAC048* NSZ048 - -
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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
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NS SPLIT INSTALLATION MANUAL Heat Recovery Connections To maximize 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 ve
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NS SPLIT INSTALLATION MANUAL Plumbing Installation 1. 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. 2. Remove drain valve and fitting. 3. Thread the 3/4-inch NPT x 3-1/2-inch brass nipple into the water heater drain port. 4. Attach the center port of the 3/4-inch FPT tee to the opposite end of the brass nipple. 5. Attach the 1/2-inch copper to 3/4-inch NPT adaptor
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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 descriptionofoperation) S 2 – This Switchallows theunittodownstagewiththet -stat whenOFF andfinishonsecondstagewhen C ON. Finish second stagereduces stagechanginginrecipdualcapacitycompressorsandshould be ON for unzonedDual CapE-Series or Premier 2 speed units. 3 -Comfort Alert faultoutputtoPremier ControlBoard R 4 – SW2-8 must be in
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NS SPLIT INSTALLATION MANUAL Microprocessor Control Startup Hot Water Justification The unit will not operate until all the inputs and safety controls Since compressor hot gas temperature is dependant on loop are checked for normal conditions. At first power-up, a four-minute temperature in cooling mode, loop temperatures may be too low delay is employed before the compressor is energized. to allow proper heating of water. The control will monitor water and refrigerant temperatures to determi
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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 thermos
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NS SPLIT INSTALLATION MANUAL Operation Logic Data HEATING COOLING SL1 - IN SL2 - IN OPERATION LOGIC FAN ON ON ON STG1 STG2 STG3 EMERG STG1 STG2 DUAL CAPACITY UNITS Compressor-Lo On Off Off Off On Off - - - Compressor-Hi Off On On Off Off On - - - Rev Valve Off Off Off Off On On - - - Loop Pump On On On Off On On - On - DHW Pump On On Off Off On On - - - Secondary 1- Out On On On Off On On - - - Secondary 2- Out Off On On Off Off On - - - Emerg LED Off Off Off On Off Off - - - T-Stat Signal Y1
