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Air Handler
Design Features
Factory Options
Accessories
Dimensional Data
Physical Data
Performance Data
Engineering Guide Specifications
IM1603 07/08
WaterFurnace Envision Series Air Handler Installation Manual
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Table of Contents Model Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Sizing Selection . . .
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Nomenclature Initial Inspection When the equipment is received, all items should be care- Units in question should also be internally inspected. If any fully checked against the bill of lading to be sure all crates damage is noted, the carrier should make the proper nota- and cartons have been received. Examine unit
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information tions in the literature, tags and labels attached to the unit Safety Considerations and other safety precautions that may apply. Warning: Before performing service or maintenance op- erations on a system, turn off main power switches to the Follow all safety codes. Wear safety glasses and work equipment. Electrical shock could cause personal injury. gloves. Use a quenching cloth for brazing operations and ha
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information Air Handler Sizing Selection The Envision Air Handlers are designed for R410a refrigerant and should be matched with Envision Split series compressor section according to the table below. Indoor Split Model Indoor Split Model Outdoor Split Model Air Handler Airfl ow(CFM) Electric Heat (kW) (Single) (Dual Capacity) (Dual Capacity) NAH022A***1R NSZ022 - 800 5 NAH026A***1R - NDZ026 NDS02
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information Condensate Drain To facilitate condensate removal, the air handler should be pitched 1/4” towards the drain in both directions. The drain line contains cold water and should be insulated in uncondi- tioned spaces to avoid drain line condensation from drip- ping on ceiling, etc. The drain pan has a primary and aux- iliary drain connection. The air handler drain connections must be connected to
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information Bottomflow Application Horizontal Right Air Discharge To convert the NAH series air handlers for bottomflow ap- Application plications follow the steps shown below: To convert the NAH series air handlers for horizontal right 1. Remove all access panels. Disconnect the blower air discharge applications follow the steps shown below harnesses from the motor and loosen ground wire from 1. Remove all access panels.
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information Air Handler Installation Refer to the Refrigerant Line Sizing table to determine the proper line set configuration for the system being installed. The air handler is attached to the shipping pallet with Line sets over 60 feet in length are not recommended. If screws. Prior to setting the unit in place remove the ship- the line set is kinked or deformed and cannot be reformed, ping screws located in the front
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information 30 minutes after the adjustment is made for the system Refrigeration to stabilize. The Envision NAH series air handlers are supplied with an 3. Once the proper superheat setting has been achieved expansion device. Once the line set has been brazed into replace and tighten the seal cap. the air handler the txv bulb must be attached to the suc- Warning – There are 8 total (360°) turns on the superheat tion line
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL General Installation Information Figure 4: Decrease Superheat: Open Valve Increase Superheat: Close Valve 9
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Hydronic Models The water heater and hydronic air handler must be lo- Dole valve for air purging cated indoors and not subject to freezing temperatures. The water heater must be installed in accordance to local codes and its own installation instructions. The piping between the water heater and air handler should be kept to a minimum. Piping should be sized to allow for water velocities of 2’-4’ per second. At average water velocities, ai
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Hydronic Models Water Presure Drop - Hydronic Coil Pressure Drop (PSI) Flow gpm 40°F 50°F 60°F 100°F 110°F 120°F 130°F 3.0 0.5 0.5 0.5 0.4 0.4 0.4 0.4 4.5 0.9 0.9 0.9 0.8 0.8 0.8 0.8 6.0 1.4 1.4 1.4 1.2 1.2 1.2 1.2 9.0 2.8 2.6 2.5 2.4 2.4 2.4 2.3 12.0 4.6 4.4 4.2 4.0 4.0 4.0 3.9 15.0 7.0 6.8 6.6 6.0 6.0 5.9 5.8 Coil Capacity vs. Entering Water Temperature Entering Water Temperature °F EAT °F 100 110 120 130 140 150 65 44% 56% 69% 81% 94% 106% 70 37
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Electrical Data Electric Heat Heater Minimum Circuit Maximum Fuse/ Aux. Heat Capacity Total Unit FLA Supply Voltage Fan Motor Ampacity Ampacity HACR Model Minimum Rated Voltage KW BTUH Circuit Min/Max FLA CFM 240v 240v 208v 240v 208v 240v 208v 240v 208v 240v 00 - 4.0 - - 4.0 4.0 5.0 5.0 10 10 NAH 022 4.8 16,382 single 740 4.0 17.3 20.0 21.3 24.0 26.6 30.0 30 30 0 0 - 4.0 - - 4.0 4.0 5.0 5.0 10 10 NAH 026 4.8 16,382 single 740 4.0 17.3 20.0 21.3 2
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Electrical Data Wiring Schematic 208-230/60/1 G PB Legend L1 L2 Transformer Gry(6) Factory Low voltage wiring Thermistor Black Gry(4) T Factory Line voltage wiring Field low voltage wiring Light emitting diode - Green G 24V Brown Red NOTE 1 Field line voltage wiring Orange Blue Optional block Relay coil DC Voltage PCB traces Grn Internal junction Capacitor w/ bleed resistor Yel Blk/Wh Quick connect terminal 1 2 3 4 5 Switch - Condensate overflow P4
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Electrical Data Wiring Schematic 208-230/60/1 208-230/60/1 Note 4 Circuit 1 Circuit 2 Legend G L1 L2 L3 L4 G Factory Low voltage wiring Thermistor PB T Factory Line voltage wiring BRK1 BRK2 Transformer L1 L2 Red (2) Field low voltage wiring Light emitting diode - Green G Field line voltage wiring Black Black(3) Optional block Relay coil Brown DC Voltage PCB traces 24V Red NOTE 1 Orange Internal junction Capacitor w/ bleed resistor Quick connect ter
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL ECM Blower Control The ECM blower motor is controlled by an interface board installed in the air handler and allows field selectable CFM settings. The interface board receives inputs from the thermostat and converts them to signals used by the ECM motor. There are four different airflow settings that are field selectable via DIP switches (see Blower Performance table). Cooling/Heating settings The cooling/heating CFM settings determine the n
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Blower Performance Dip Switch Settings
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Unit Start Up • Check that supply voltage matches nameplate data. • Fuses, breakers and wire size are correct. • Low voltage wiring is complete. • Piping is complete and water system is cleaned and flushed. • Air is purged from the closed loop system. • Isolation valves are open, water control valves or pumps are wired. • Condensate line is open and correctly pitched. • Transformer switched to 208v if applicable. • DIP switches are set correctly.
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Dimensional Data Top Flow/Horizontal Unit Configuration DD CC EE FF W G GG D C II HH E J K L M AA F BB O N P B Q H JJ R I S T U V A LL MM Refrigerant/Water Topflow/ Overall Cabinet Connections DE F Horizontal 3/4" cond 1/2" cond Return Configuration AB C G H I J K L M N OP QR S Power Low Air Duct Suction / Liquid / Width Depth Height Supply Voltage Flange Water Out Water In in. 21.0 26.1 57.3 54.0 52.3 0.7 58.1 27.4 28.3 26.4 23.9 15.9 9.5
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ENVISION SERIES AIR HANDLER INSTALLATION MANUAL Dimensional Data Bottom Flow Unit Configuration I A X B W V 0.71 F U JJ T S R H KK LL MM Y G C DD CC EE J K L D M AA N BB E FF O P GG HH II Q Z Refrigerant/Water Overall Cabinet Connections DE F Bottomflow 3/4" cond 1" cond Return Configuration AB C GH I J K L M N O P QR Low Power Air Duct Suction / Liquid / Width Depth Height Voltage Supply Flange Water Out Water In in. 21.0 26.1 57.3 5.1 3.3 0.7 58.1 27.4 28.3 51.6 49.1 41.2 34.6 29.2 2
