PREMIER E SERIES DUAL CAPACITY INSTALLATION AND MAINTENANCE MANUAL
5
WATER QUALITY
The unit may be ordered with either a copper or a cupronickel coaxial heat exchanger. Copper is
adequate for closed loop and open loop groundwater systems which are not high in mineral content. In
conditions anticipating moderate scale formation or in brackish water, a cupronickel heat exchanger is
recommended. In groundwater situations where scaling
could be heavy or where biological growth such as iron bacteria will be present, a closed loop system
is recommended.
The heat exchanger coils in groundwater systems may, over a period of time, lose heat exchange
capabilities due to a buildup of mineral deposits inside. These can be cleaned, but only by a
qualified service mechanic, as special solutions and pumping equipment are required. Desuperheater
coils can likewise become scaled and possibly plugged. In areas with extremely hard water, the
owner should be informed that the heat exchanger may require occasional flushing.
FREEZE PROTECTION
Set the freeze protection switch SW2-2 on the printed circuit board for applications using a
closed loop antifreeze solution to "LOOP". On applications using an open loop/groundwater system,
(or closed loop no antifreeze) set this dip switch to "WELL" (the factory setting). (See schematics on
pages 14 and 15.)
CONDENSATE DRAIN
On vertical units, the internal condensate drain assembly consists of a drain tube which is con-
nected to the drain pan, a 3/4" PVC female adapter and a flexible connecting hose. The female adapter
may exit either the front or the side of the cabinet. The adapter should be glued to the field-installed
PVC condensate piping. On vertical units, a condensate hose is inside all cabinets as a trapping loop;
therefore, an external trap is not necessary. On horizontal units, a copper stub is provided for conden-
sate drain piping connection. An external trap is required (see Figure 5B). If a vent is necessary, an
open stand pipe may be applied to a tee in the field-installed condensate piping.
Locking
Ring
Stainless
Steel
Snap Ring
Gasket
Support
Sleeve
Gasket
Material
Figure 4B -
The female
locking ring is threaded
onto the pipe threads which
hold the male pipe end
against the gasket and seals
the joint.
Figure 4A
