Page 3 - Table of Contents
1 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 ...
Page 4 - Model Nomenclature
2 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 Volt...
Page 5 - Use a quenching cloth for brazing operations.; General Installation Information
3 NS SPLIT INSTALLATION MANUAL 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 heating and air conditioning equipment. Untrained personn...
Page 6 - Equipment Selection; Coil currently is R-410A rated
4 NS SPLIT INSTALLATION MANUAL 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...
Page 7 - Air Handler Installation
5 NS SPLIT INSTALLATION MANUAL 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 blower coil unit for details on installing the air handling portion of the system. All b...
Page 8 - Dual Fuel Systems
6 NS SPLIT INSTALLATION MANUAL 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 fur...
Page 9 - General; cal data for fuse or cicuit breaker sizing information.; Electrical Data; Ther mostat Wiring; Electrical
7 NS SPLIT INSTALLATION MANUAL Rated Voltage HWA Ext Total Min Max Model Voltage Min/Max Pump Loop Unit Circ Fuse/ MCC RLA LRA FLA FLA FLA Amp HACR 026 208-230/60/1 197/253 16.0 10.2 52.0 0.4 5.4 16.0 18.6 25 038 208-230/60/1 197/253 26.0 16.6 82.0 0.4 5.4 22.4 26.6 40 049 208-230/60/1 197/253 33.0 ...
Page 10 - Water Piping; IMPORTANT; Flow Center Installation; For ease of installation, attach provided hoses to
8 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 carefu...
Page 11 - Air Handler Coil Data; BcPS; Air Handler Nomenclature
9 NS SPLIT INSTALLATION MANUAL Air Handler Coil Data Line Set Sizes 1]WZAc`TOQS /`SOa_Tb 4>7 @]ea BcPS 2WO[SbS` #&! ! !& #&! !& ;ObQVW\U/W` 6O\RZS` </6"&$ </6 $!$ 3\dWaW]\ A^ZWb;]RSZ $!& "'% Unit Air Factory Size Handler Suction Liquid Suction Liquid Suction ...
Page 12 - Physical Data
10 NS SPLIT INSTALLATION MANUAL </6 </6 $ </6! </6!$ </6" </6"& </6$ /W`1]WZB]bOZ4OQS/`SOTb I[ KBcPS]cbaWRSRWO[SbS`W\I[[K<c[PS`]T`]ea4W\a^S`W\QVAcQbW]\ZW\SQ]\\SQbW]\W\I[[KaeSOb:W_cWRZW\SQ]\\SQbW]\W\I[[KaeSOb <][W\OZQ]]ZW\UQO^OQWbgb]\aIYEK &I$""K I%#...
Page 13 - Envision Coil Nomenclature
11 NS SPLIT INSTALLATION MANUAL Envision Coil Nomenclature <@ / 1 $ 1 1OPW\Sb ;]RSZBg^S 1+3\QOaSR <@+3\dWaW]\@ST`WUS`O\b1]WZ C+C\QOaSR <6+3\dWaW]\6gR`]\WQ1]WZ 1O^OQWbg 1]\TWUc`ObW]\ @ST`WUS`O\b;]RSZa /+/1]WZ $;0BC6!$;0BC6"&;0BC6 1]WZ $;0BC6 6gR`]\WQ;]RSZa $;0BC6 <]bS(/ZZ@ST`WUS`O...
Page 14 - vice valves must be protected to prevent overheating; Heat Recover y Unit for Domestic Hot Water
12 NS SPLIT INSTALLATION MANUAL 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 t...
Page 15 - Heat Recovery Connections; installing a heat recovery.; CAUTION: Elements will burn out if energized dry.; Water Tank Preparation
13 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 h...
Page 16 - Plumbing Installation; or damage to the desuperheater circulator will occur.; Heat Recover y Startup
14 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-in...
Page 17 - Wiring Schematics
15 NS SPLIT INSTALLATION MANUAL Wiring Schematics Envision Series - Dual Capacity Split Wiring Schematic - 208-230/60/1 HWL HP LP WCL 97P774-31 3/9/07 St at us LE D PC B SW4 RRRRRGYR T T 240V L2 240V L1 240V L2 P6 Premier 2 Microprocessor Logic Control (DC Voltage) P1 Fused L2 R C CC-GND NO CR2 COM ...
Page 18 - Microprocessor Control
16 NS SPLIT INSTALLATION MANUAL 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 delay is employed before the compressor is energized. Component Sequencing Delays Components are sequenced and delayed for op...
Page 19 - Lockout Conditions
17 NS SPLIT INSTALLATION MANUAL 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 rema...
Page 20 - Operation Logic Data
18 NS SPLIT INSTALLATION MANUAL OPERATION LOGIC HEATING COOLING FAN ON SL1 - IN ON SL2 - IN 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...
Page 21 - DIP Switch Settings
19 NS SPLIT INSTALLATION MANUAL DIP Switch Settings DIP SWITCH NUMBER DESCRIPTION OFF POSITION ON POSITION SW1 N/A NOT USED N/A N/A SW2 1 Service/Test Mode - Allows control of “NORM” or “TEST” opera - tional modes. Test mode accelerates most timing functions 16 times to allow faster troubleshooting....
Page 22 - Connection to Air Coil; Braze line set to the service valve stubs on the; Refrigeration
20 NS SPLIT INSTALLATION MANUAL 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 s...
Page 23 - Leak Testing; mated using the following equation:; Charging the System; Determining Superheat; the TXV to other superheat settings:
21 NS SPLIT INSTALLATION MANUAL 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 r...
Page 24 - Determining Subcooling; Conversion Chart on page 23.
22 NS SPLIT INSTALLATION MANUAL 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 sto...
Page 25 - Pressure/Temperature Coversion Char t for R-410A
23 NS SPLIT INSTALLATION MANUAL Pressure/Temperature Coversion Char t for R-410A PRESSURE (PSIG) TEMP °F PRESSURE (PSIG) TEMP °F PRESSURE (PSIG) TEMP °F PRESSURE (PSIG) TEMP °F PRESSURE (PSIG) TEMP °F 60 8.5 180 63.5 300 96.3 420 120.6 540 140.0 62 9.9 182 64.2 302 96.8 422 120.9 542 140.3 64 11.2 1...
Page 26 - Dual Capacity Models; Unit Operating Parameters
24 NS SPLIT INSTALLATION MANUAL Dual Capacity Models Unit Operating Parameters Note: Cooling performance based on entering air temperatures of 80º F DB, 67º F WB. Heating performance based on entering air temperature of 70º F DB. First Stage Operation Suction Pressure PSIG Discharge Pressure PSIG Su...
Page 27 - Pressure Drop and Recommended Flow Rates; Dual Capacity
25 NS SPLIT INSTALLATION MANUAL Pressure Drop and Recommended Flow Rates 30°F 50°F 70°F 90°F 110°F 4 1.4 1.3 1.2 1.1 1.0 6 2.8 2.6 2.4 2.3 2.1 8 4.7 4.4 4.1 3.8 3.5 10 7.0 6.6 6.2 5.8 5.3 3 0.8 0.7 0.7 0.7 0.6 5 2.0 1.8 1.7 1.6 1.5 7 3.6 3.4 3.2 3.0 2.8 9 5.8 5.5 5.1 4.8 4.4 5 1.2 1.2 1.1 1.0 1.0 7 ...
Page 28 - High voltage is correct and matches nameplate.; Startup Steps; ing instructions and complete the startup procedure.; Unit Star tup; Before Powering Unit, Check The Following
26 NS SPLIT INSTALLATION MANUAL 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. Air is purged from closed loop system. Isolation valves are open, water control valves or loop pumps...
Page 29 - Final Evaluation
27 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...
Page 30 - Heating Cycle Analysis; Cooling Cycle Analysis; Unit Star tup/Troubleshooting
28 NS SPLIT INSTALLATION MANUAL Heating Cycle Analysis COOLING TXV - ACTIVERIGHT TO LEFT ClgTXV Lineset length Measure liquid linetemperature andpressure here inboth heating andcooling modes COAX HEATING TXV - ACTIVE LEFT TO RIGHT HtgTXV Measure suction temperaturehere at TXV bulb in heating modes. ...
Page 31 - Troubleshooting; Standard Microprocessor Controls; If steps above check properly, replace unit control.; Refrigerant Systems; ment to the refrigerant charge may be necessary.; LED Definitions and Diagnostics; Standard Microprocessor
29 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 contr...
Page 32 - Preventive Maintenance; Water Coil Maintenance; Filters; possibility of overflow.; Blower Motors; See Water Coil Maintenance section above.; Air Coil; Replacement Procedures; Obtaining Parts; warranty return authorization and assistance.
30 NS SPLIT 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 a...
Page 33 - Physical Dimensions; Top View; Cabinet Dimensions and Refrigerant Piping Connections; PHYSICAL DIMENSIONS
31 NS SPLIT INSTALLATION MANUAL Physical Dimensions B Top View F G D E I H Suction Line Connection Connection Point for Field Installed Heat Recovery Unit Liquid Line Connection Lineset connections are braze typeinternally mounted Front View A C Side View WATER IN WATER OUT Rear View L K J Side View...
