Envision Split Installation Manual Envision Series Geothermal Indoor Split Heat Pumps • R-410A Refrigerant • 2 - 6 Ton Single Speed • 2 - 6 Ton Dual Capacity Installation Information Water Piping Connections Desuperheater Connections Electrical Startup Procedures Troubleshooting Preventive Maintenance IM1592 10/08
ENVISION SERIES INSTALLATION MANUAL Model Nomenclature N D Z 049 A 1 1 A C Coax Options C= Copper N= Cupronickel Model Type N= Envision Compressor Type D= Dual Capacity S= Single Speed Open Option A= Standard Hot Water Option 0= None 1= Hot Water Gerneration with factory installed pump Cabinet Configuration Z= Indoor Split Unit Capacity Voltage 1= 208-230/60/1 Vintage A= Current Physical Characteristics Model 022 030 042 048 060 070 026 Single Speed Scroll Compressor (1 each) Factor
ENVISION SERIES INSTALLATION MANUAL Table of Contents Model Nomenclature 2 Physical Characteristics 2 General Installation Information 4-8 Air Handler Physical Data 9 Line Set Sizes 9 Open Loop Well Water Systems 10-11 Closed Loop Ground Source Systems 12 Desuperheater 13-14 Electical Data 15 Thermostat Wiring 15 Wiring Schematics 16-17 Microprocessor Control Features and Operation 18-19 Operation Logic Data 20 DIP Switch Settings 21 Refrigeration 22-25 Unit Operating Para
ENVISION SERIES INSTALLATION MANUAL General Installation Information Safety Considerations WARNING: Before performing service or maintenance operations on a system, turn off main power switches to the indoor unit. If applicable, turn off the accessory heater power switch. Electrical shock could cause personal injury. Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electrical components.
ENVISION SERIES INSTALLATION MANUAL General Installation Information (continued) 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.
ENVISION SERIES INSTALLATION MANUAL General Installation Information (continued) 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.
ENVISION SERIES INSTALLATION MANUAL General Installation Information (continued) 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.
ENVISION SERIES INSTALLATION MANUAL General Installation Information (continued) Figure 3: Swivel Connections Water Piping (Residential Units) 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.
ENVISION SERIES INSTALLATION MANUAL Air Handler Physical Data Air Handler Model Number (Refrigerant) NAH022 NAH026 NAH030 NAH036 Air Coil Total Face Area, ft2 [m2] Tube outside diameter - in. [mm] NAH048 NAH060 3/8 [9.52] Number of rows Evaporator Coil NAH042 5.83 [0.54] 2 3 Fins per inch 12 Suction line connection - in. [mm] sweat 5/8 [15.87] 7/8 [22.22] Liquid line connection - in. [mm] sweat 3/8 [9.52] Refrigerant R-410a Nominal cooling capacity - tons [kW] 1.8 [6.44] 2.1 [7.
ENVISION SERIES INSTALLATION MANUAL Open Loop - Well Water Systems Typical open loop piping is shown below. Always maintain water pressure in the heat exchanger by placing water control valves at the outlet of the unit to prevent mineral precipitation. Use a closed bladder type expansion tank to minimize mineral formation due to air exposure.
ENVISION SERIES INSTALLATION MANUAL Open Loop - Well Water Systems (continued) Solenoid Wiring Water control valves draw their power directly from a unit’s 24V transformer and can overload and possibly burn out the transformer. Check total VA draw of the water valve and ensure that it is under 15 VA. Water Quality In ground water situations where scaling could be heavy or where biological growth such as iron bacteria will be present, a closed loop system is recommended.
ENVISION SERIES INSTALLATION MANUAL Closed Loop Ground Source Systems Note: For closed loop systems with antifreeze protection, set SW2-2 to the “loop” position (see table on page 21). Once piping is completed between the unit, pumps and the ground loop (see figure below), final purging and charging of the loop is required. A flush cart (or a 1.5 HP pump minimum) is needed to achieve adequate flow velocity in the loop to purge air and dirt particles from the loop itself.
ENVISION SERIES INSTALLATION MANUAL Desuperheater Connections To maximize the benefits of the desuperheater 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 desuperheater. Residential units with desuperheaters contain an internal circulator and fittings.
ENVISION SERIES INSTALLATION MANUAL Desuperheater Connections (continued) 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.
ENVISION SERIES INSTALLATION MANUAL Electrical Data 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 electrical data for fuse or cicuit breaker sizing information.
ENVISION SERIES 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 ) S 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 -Series or Premier 2 speed units.
ENVISION SERIES INSTALLATION MANUAL Wiring Schematics Envision Series - Single Speed Split Wiring Schematic - 208-230/60/1 Notes: S 1 - 24V Accessory relay (see SW2 - 3 for description of operation ) C 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 -Series or Premier 2 speed units.
ENVISION SERIES 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 delay 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.
ENVISION SERIES INSTALLATION MANUAL Microprocessor Control (continued) 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 “Y1” input.
ENVISION SERIES INSTALLATION MANUAL Operation Logic Data OPERATION LOGIC STG1 HEATING STG2 STG3 EMERG COOLING STG1 STG2 FAN ON SL1 - IN ON SL2 - IN ON - - - SINGLE SPEED UNITS Compressor Rev Valve On Off On Off On Off Off Off On On On On Loop Pump On On On Off On On - On - DHW Pump On Off Off Off On On - - - Secondary 1- Out On On On Off On On - - - Emerg LED T-Stat Signal Off Y1 Off Y1, Y2 Off Y1, Y2, W On W Off Y1, O Off Y1, Y2, O Off G - - On Off
ENVISION SERIES INSTALLATION MANUAL DIP Switch Settings DIP SWITCH NUMBER SW1 SW2 DESCRIPTION OFF POSITION N/A NOT USED N/A N/A 1 Service/Test Mode - Allows control of “NORM” or “TEST” operational modes. Test mode accelerates most timing functions 16 times to allow faster troubleshooting. Test mode also allows viewing the “CURRENT” status of the fault inputs on the LED display.
ENVISION SERIES 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.
ENVISION SERIES 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 pressure reaches 60 to 90 PSIG. Never use oxygen or acetylene to pressure test.
ENVISION SERIES INSTALLATION MANUAL Refrigeration (continued) 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.
ENVISION SERIES INSTALLATION MANUAL Pressure/Temperature Coversion Chart for R-410A PRESSURE (PSIG) 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 130 132 134 136 138 140 142 144 146 148 150 152 154 156 158 160 162 164 166 168 170 172 174 176 178 TEMP °F 8.5 9.9 11.2 12.5 13.8 15.1 16.3 17.5 18.7 19.8 21.0 22.1 23.2 24.3 25.4 26.5 27.5 28.6 29.6 30.6 31.6 32.6 33.5 34.5 35.4 36.4 37.3 38.2 39.1 40.0 40.9 41.7 42.6 43.4 44.3 45.
ENVISION SERIES INSTALLATION MANUAL Unit Operating Parameters Single Speed Models - NSZ022 thru NSZ070 Water Entering Water Flow GPM/ Temp °F Ton 1.5 50 3.0 1.5 70 3.0 1.5 90 3.
ENVISION SERIES INSTALLATION MANUAL Unit Operating Parameters NDZ026 thru NDZ072 First Stage Operation Entering Water Water Flow Temp °F GPM/Ton 50 70 90 1.5 3.0 1.5 3.0 1.5 3.0 Entering Water Water Flow Temp °F GPM/Ton 30 50 70 1.5 3.0 1.5 3.0 1.5 3.
ENVISION SERIES INSTALLATION MANUAL Unit Startup Before Powering Unit, Check The Following: • 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 wired. • Condensate line open and correctly pitched. • Transformer switched to 208V if applicable. • DIP switches are set correctly.
ENVISION SERIES INSTALLATION MANUAL Unit Startup (continued) 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 operating mode and set temperature to maintain desired comfort level. 18. Instruct the owner/operator in the proper operation of the thermostat and system maintenance.
ENVISION SERIES INSTALLATION MANUAL Unit Startup/Troubleshooting Heating Cycle Analysis Measure suction temperature here at TXV bulb in cooling modes. Measure suction temperature here at TXV bulb in heating modes.
ENVISION SERIES INSTALLATION MANUAL Pressure Drop and Recommended Flow Rates Single Speed Model 022 030 036 042 048 060 070 GPM 3 4.5 6 8 4 6 8 10 5 7 9 12 5 8 11 14 6 9 12 16 9 12 15 20 12 15 18 24 30°F 0.9 1.7 2.8 4.7 1.5 3.0 5.1 7.7 1.0 2.1 3.6 6.3 0.8 2.1 4.2 7.6 1.1 2.3 3.9 6.7 2.4 3.9 5.7 9.5 3.0 4.4 6.0 9.7 Dual Capacity Pressure Drop (psi) 50°F 70°F 90°F 0.9 0.8 0.7 1.6 1.5 1.4 2.7 2.5 2.3 4.4 4.1 3.9 1.4 1.3 1.2 2.8 2.7 2.5 4.8 4.5 4.2 7.2 6.8 6.3 1.0 0.9 0.8 1.9 1.8 1.7 3.3 3.0 2.8 5.
ENVISION SERIES 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: • Check for thermostat and field control wiring (use the diagnostic inputs mode). 4.
ENVISION SERIES 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.
ENVISION SERIES INSTALLATION MANUAL Physical Dimensions B C A H M L K E D ENVISION - NZ SPLIT DIMENSIONAL DATA NZ 022-030 DIMENSION VALUE A 19.25 B 22.50 C 26.50 D 1.93 E 6.93 F 8.44 G 11.55 H 13.43 J 16.43 K 8.55 L 10.30 M 11.80 NZ 036-072 DIMENSION VALUE A 21.25 B 25.50 C 31.50 D 2.21 E 7.21 F 9.21 G 12.14 H 15.83 J 18.83 K 7.71 L 9.46 M 10.
Manufactured by WaterFurnace International, Inc. 9000 Conservation Way Fort Wayne, IN 46809 www.waterfurnace.com IM1592 1 0/0 8 Product: Type: Size: Document: Envision Series Geothermal/Water Source Indoor Split Heat Pumps 2-5.5 Ton Single Speed 2-6 Ton Dual Capacity Installation Manual WaterFurnace International, Inc., 9000 Conservation Way, Fort Wayne, IN 46809-9794.
