Installing horizontal units cont – WaterFurnace Envision (XL) User Manual

Page 9

ENVISION 7-25 TONS INSTALLATION MANUAL

1/2'' Pitch

Figure 5: Unit Pitch for Drain

Figure 4: Suggested Layout of Condensate

Installing Horizontal Units cont.

Front

Back

Model

Return / Discharge

Left

Right

Left

Left / Side or End

30%

26%

22%

Right / Side or End

26%

30%

22%

Approximate

080 - 120

Controls

Horizontal Unit Corner Weight Distribution

Duct System

An air outlet collar is provided on vertical top flow units and all horizontal units to facilitate a duct connection. A flexible

connector is recommended for discharge and return air duct connections on metal duct systems. Uninsulated duct should

be insulated with a minimum of 1-inch duct insulation. Application of the unit to uninsulated ductwork in an unconditioned

space is not recommended as the unit’s performance will be adversely affected.

If the unit is connected to existing ductwork, check the duct system to ensure that it has the capacity to accommodate the

air required for the unit application. If the duct is too small, as in the replacement of heating only systems, larger ductwork

should be installed. All existing ductwork should be checked for leaks and repaired if necessary.

The duct system should be sized to handle the design airflow quietly and efficiently. To maximize sound attenuation of the

unit blower, the supply and return plenums should include an internal duct liner of fiberglass or constructed of ductboard

for the first few feet. On systems employing a sheet metal duct system, canvas connectors should be used between the unit

and the ductwork. If air noise or excessive airflow is a problem, the blower speed can be changed.

Water Piping

The proper water flow must be provided to each unit whenever the unit operates. To assure proper flow, use pressure/tem-

perature ports to determine the flow rate. These ports should be located at the supply and return water connections on the

unit. The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant-to-

water heat exchanger.

All source water connections on commercial units are fittings that accept a male pipe thread (MPT). Insert the connectors

by hand, then tighten the fitting with a wrench to provide a leakproof joint. When connecting to an open loop (groundwa-

ter) system, thread any copper MPT fitting into the connector and tighten in the same manner as described above.

1.5 in.

3/4 in. PVC tube stub

3/4 in. PVC
Coupling

Vent (if needed)

3/4 in. PVC

1/8 in. per foot