Envision Air Handler Installation Manual

General Installation Information Refrigeration The Envision NAH series air handlers are supplied with an expansion device. Once the line set has been brazed into the air handler the txv bulb must be attached to the suc- tion line outside of the cabinet and insulated with foam tape. Be careful not to crush the txv bulb by over-tighten- ing the clamp. The txv supplied has an internal check valve so no external check valve is necessary. The air handler txv should be adjusted initially per TXV Superheat Adjustments table. Check sub-cooling and s ...

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Dimensional Data Bottom Flow Unit Configuration Overall Cabinet Bottomflow D E F Configuration A B C 3/4" cond 1" cond Return G H I J K L M N O P Q R Width Depth Height Low Voltage Power Supply Air Duct Flange Suction / Water Out Liquid / 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 28.6 6.1 4.2 0.9 cm. 53.4 66.3 145.6 12.9 8.5 1.8 147.4 69.6 71.8 131.1 124.7 104.7 87.9 74.2 72.7 15.4 10.8 2.4 Condensate is stainless steel 3/4" FPT Rev:A 3/12/08 Discharge flange is field installed and extends 1" (25.4 mm) fro ...

General Installation Information Refrigeration The Envision NAH series air handlers are supplied with an expansion device. Once the line set has been brazed into the air handler the txv bulb must be attached to the suc- tion line outside of the cabinet and insulated with foam tape. Be careful not to crush the txv bulb by over-tighten- ing the clamp. The txv supplied has an internal check valve so no external check valve is necessary. The air handler txv should be adjusted initially per TXV Superheat Adjustments table. Check sub-cooling and s ...

Electrical Data Thermistor Light emitting diode - Green Relay coil Capacitor w/ bleed resistor Switch - Condensate overflow Switch - High pressure Switch - Low pressure Switch -Hot Water On/Off Polarized connector Factory Low voltage wiring Factory Line voltage wiring Field low voltage wiring Field line voltage wiring Optional block DC Voltage PCB traces Internal junction Quick connect terminal Wire nut Field wire lug Ground Fuse HE - LP - PB - SW1 - Heater element Low pressure switch Power block DIP package 10 position Legend Relay Contacts- ...

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 normal cooling/heating CFM when the unit is not in dehumidifica- tion mode or auxiliary heat mode. DIP ...