WaterFurnace Envision (XL) - Manual (Page 9)

ENVISION 7-25 TONS INSTALLATION MANUAL
10
1/2'' Pitch
Figure 5: Unit Pitch for Drain Figure 4: Suggested Layout of Condensate
Installing Horizontal Units cont.
A B C D
Front Front Back Back
Model Return / Discharge Left Right Right Left
Left / Side or End 30% 26% 22% 22%
Right / Side or End 26% 30% 22% 22%
Approximate
080 - 120
A
B
C
D
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.
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