FORM
DUCTWORK
When installing ductwork, adhere to local Codes and sensible practice. Minimize duct runs and avoid abrupt changes in direction where possible. Allow ample access space for servicing of the coils and changing of filters. Perform regular maintenance on ducts to increase unit life, maintain efficient operation, and reduce accumulation of explosive dust. Refer to blower performance charts, and engineer duct runs and accessory pressure drop so as not to exceed maximum external static values.
Canvas or other types of flexible collars are recommended for connecting the air ducts to the unit. The supply air duct collar can be connected directly to the blower outlet flanges. Return air may be ducted to the unit, or drawn directly from the conditioned space (with optional return air grille). If a ducted return is desired, duct connection flanges may be secured directly to the air intake opening – filters are accessible from the right hand side.
The Manufacturer will not accept any liability resulting from incorrect instal- lation of this equipment. Follow instal- lation instructions carefully.
EVAPORATOR BLOWER DISCHARGE
CONVERSION
All models can be field converted to the alternate evaporator discharge orientation, as indicated on the unit dimensional drawings. All models are shipped with vertical fan discharge as standard.
The removable upper fan module that can be rotated 180° for top rear discharge applications (see below). In addition, the blower outlet panel may be interchanged with the front panel of the fan module. Interchanging these two panels allows horizontal fan discharge to either front or rear of the unit.
Procedure for converting the fan discharge from vertical to horizontal is similar on all models, single fan or dual fan.
-Remove blower drive belt on all models with base mounted motors. Remove the complete fan motor and drive on models with blower mounted motor assemblies.
-Remove the panel attachment screws on the alternate location access panel (front blower module panel). The front roof support angle must be removed to allow access to the front panel. Remove the panel and set aside.
-Remove the panel attachments screws on the blower outlet mounting panel. Do not remove fasteners securing blowers to panel! The blowers are to remain attached to the mounting panel at all times.
-Carefully remove the blower panel assembly from the evaporator cabinet. Do not allow blower housings to contact the evaporator coil during the removal. On some models, the housing(s) will have to be "rotated" to exit through the panel opening.
-Interchange the blower panel assembly with the position of the alternate access panel. Exercise care in locating the panel. Do not allow blower housings to contact the evaporator coil. Install the attachment screws and tighten securely.
-Install the blank access panel into the remaining evaporator opening. Fasten securely.
-Relocate the evaporator fan drive motor to the alternate location.
-Install and adjust drive belts to appropriate tension. Test run blower and observe operation for unusual sounds or vibration.
In order to utilize the ‘rear vertical’ or ‘rear horizontal’ discharge, the upper fan module must be rotated.
-Disconnect power wiring at motor terminal box.
DISCONNECT AND LOCK OUT POWER WHEN SERVICING UNIT. FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK.
-Remove corner connecting brackets which secure the blower module to the lower evaporator unit.
-Carefully lift the blower module, and rotate 1800. Reposition the blower module on top of the evaporator/compressor unit. Reinstall the corner connecting brackets.
Connect new power wire leads, from the evaporator motor contactor in the electrical box to the motor terminal box. Ensure wires are routed clear of any moving components. Secure the wiring so that it does not contact the evaporator coil.
10 | JOHNSON CONTROLS |
