Mount the Unit, Install Condensate Drain

Preparation — The unit should be on the ground in a well lit area. Hung units should be taken down to ground level before converting.

Side to Back Discharge Conversion

1.Remove screws to free the top and discharge panels. Set screws aside for later use. See Fig. 7.

2.Remove the access panel and set aside.

3.Lift the discharge panel from side of unit and rotate it to back using care not to damage blower wiring.

4.Check blower wire routing and connections for undue tension or contact with sheet metal edges. Re-route if necessary.

5.Check refrigerant tubing for contact with other compo- nents. Adjust if necessary.

6.Reinstall top panel using screws set aside in Step 1.

NOTE: Location for some screws at bottom of discharge panel may have to be changed.

7.Manually spin fan wheel to check for obstructions. Adjust for any obstruction found.

8.Replace access panel.

Back to Side Discharge Conversion — Follow instructions above for Side to Back Discharge Conversion, noting the panels would be reversed.

Step 4 — Mount the Unit

HORIZONTAL UNIT (50PSH) — Horizontal units should be mounted using the factory-installed hangers. Proper attach- ment of hanging rods to building structure is critical for safety. See Fig. 1. Rod attachments must be able to support the weight of the unit. See Table 1 for unit operating weights.

VERTICAL UNITS (50PSV, PSD) — Vertical and downflow units are available in left or right return air configurations. See Fig. 3 and 4. Mount the unit (except 50PSD) on a vibration absorption pad slightly larger than the entire base to minimize vibration transmission. It is not necessary to mount the unit on the floor. See Fig. 9.

NOTE: Some codes require the use of a secondary drain pan under vertical units. Check local codes for more information.

A50-7731ef

Fig. 9 — 50PSV Units Mounted With

Vibration Absorption Pad

Step 5 — Check Duct System — Size the duct sys- tem to handle the design airflow quietly.

NOTE: Depending on the unit, the fan wheel may have a ship- ping support installed at the factory. This must be removed before operating unit.

SOUND ATTENUATION — To eliminate the transfer of vibration to the duct system, a flexible connector is recom- mended for both discharge and return air duct connections on metal duct systems. The supply and return plenums should in- clude internal duct liner of fiberglass or be made of duct board construction to maximize sound attenuation of the blower. Installing the WSHP unit to uninsulated ductwork in an uncon- ditioned space is not recommended since it will sweat and adversely affect the unit’s performance.

To reduce air noise, at least one 90-degree elbow could be included in the supply and return air ducts, provided system performance is not adversely impacted. The blower speed can also be changed in the field to reduce air noise or excessive air- flow, provided system performance is not adversely impacted.

EXISTING DUCT SYSTEM — If the unit is connected to existing ductwork, consider the following:

•Verify that the existing ducts have the proper capacity to handle the unit airflow. If the ductwork is too small, install larger ductwork.

•Check existing ductwork for leaks and repair as necessary.

NOTE: Local codes may require ventilation air to enter the space for proper indoor air quality. Hard-duct ventilation may be required for the ventilating air supply. If hard ducted ventilation is not required, be sure that a proper air path is provided for ventilation air to unit to meet ventila- tion requirement of the space.

Step 6 — Install Condensate Drain

HORIZONTAL UNIT (50PSH) — Slope the unit toward the drain at 1/4 in. See Fig. 10. If it is not possible to meet the re- quired pitch, install a condensate at the unit to pump conden- sate to building drain.

1/4Ó Pitch for Drainage

Pitch Toward

Drain

A50-6260

Drain Connection

Fig. 10 — Horizontal Unit Pitch

Horizontal units are not internally trapped, therefore an ex- ternal trap is necessary. Install each unit with its own individual trap and means to flush or blow out the condensate drain line. Do not install units with a common trap or vent. See Fig. 11 for typical condensate connections.

NOTE: Never use a pipe size smaller than the connection.