Envision Peripherals IM1603 installation manual Bottomflow Application

ENVISION SERIES AIR HANDLER INSTALLATION MANUAL

General Installation Information

Bottomflow Application

To convert the NAH series air handlers for bottomflow ap- plications follow the steps shown below:

1.Remove all access panels. Disconnect the blower harnesses from the motor and loosen ground wire from blower. Remove the blower by removing 2 screws from the blower mounting bracket, and slide the blower assembly out the front. Remove the stiffener bracket in front of coil, 'A' coil/pan assembly and the horizontal drain pan. This will lighten the cabinet and make it easier to maneuver.

2.Rotate the cabinet 180° from the upright position so that the discharge air opening is located at the bottom and the return air opening is at the top.

3.Install the blower assembly into the blower discharge opening at the bottom of the cabinet by sliding the blower mounting bracket under the discharge support bracket and secure in place with 2 screws. The blower harness and motor ground wire should be reattached before sliding the blower into place.

4.On the NAH042-060 install the NAHBC bottomflow conversion kit per instructions in the kit. Failure to install this kit will result in condensate blow-off from the 'A' coil into the cabinet and ductwork.

5.Install the 'A' coil into the upper section of the cabinet as pictured in Figure 2. Attach the stiffener bracket into the two holes provided in the cabinet so that the bracket is in front of the coil. The horizontal drain pan is not needed and must be discarded. Plug the 2 drain hole openings in the access panel with the plugs provided.

6.Replace the access panels.

7.Bottom air discharge units require the supply air opening to be cut at least a 1/2” larger than the unit’s air outlet.

8.When installed on combustible flooring, protect the edges of the floor opening with sheet metal over wrap or

other non-combustible material.

9.Bottom air discharge units should be sealed well to the floor to prevent air leakage.

Figure 2 - Bottomflow NAH.

Horizontal Right Air Discharge

Application

To convert the NAH series air handlers for horizontal right air discharge applications follow the steps shown below

1.Remove all access panels. Remove the stiffener bracket in front of the coil, ‘A’ coil assembly and the horizontal drain pan.

2.From the vertical upflow position, rotate the top of the cabinet 90° to the right and set in place.

3.Remove the support bracket mounted to the top plate of the ‘A’ coil. Rotate the ‘A’ coil support bracket 180° from its original position and re-attach into existing holes in the top plate of the coil. This must be done to prevent the ‘A’ coil from falling into the drain pan (Figure 3).

4.Move the horizontal drain pan from the left side of the ‘A’ coil to the right hand side of the ‘A’ coil. Place the ‘A’ coil and horizontal drain pan assembly into the cabinet

so that the support bracket is resting in the horizontal drain pan as shown in Figure 3. Attach the stiffener bracket into the two holes provided in the cabinet so that the bracket is in front of the coil.

5.Remove the 2 drain plugs from the upper right of the access panel and install them on the lower left of the access panel. Replace the access panels.

6.If the unit is suspended, the entire length of the cabinet should be supported.

Figure 3 - Horizontal Right Hand Air Discharge

Rotate the coil support bracket to this position

Important: When removing the coil, there is possible dan- ger of equipment damage and personal injury. Be careful when removing the coil assembly from the unit.

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