WATER PIPING
G E N E R A L
Piping practices vary considerably. In most cases,
codes, local ordinances and established practices
govern the selection and installation of piping. Local
building and safety codes and ordinances should be
studied and complied with.
Shut-off valves should be provided at the unit so
that normal servicing can be accomplished without
draining the system.
It is recommended that temperature and pressure in-
dicators be installed at the inlet and outlet of the
shells to aid in the normal checking and servicing of
the unit. Also, the installation of wire mesh strainers
at the pump suction will protect the pump and shells
from foreign matter.
be
A preliminary leak check of the water piping should
made before filling the system.
Vibration eliminators are recommended in all lines
connected to the SEASONPAK water chiller.
C H I L L E D W A T E R P I P I N G
The water flow entering the cooler must always be on
the end nearest the expansion valves and cooler re-
frigerant connections to assure proper expansion valve
operation and unit capacity.
Design the piping so that is has a minimum number
of changes in elevation. Include manual or automatic
vent valves at the high points of the chilled water
piping, so that air can be vented from the water cir-
cuit. System pressures can be maintained by using an
expansion tank or a combination pressure relief and
reducing valve.
All chilled water piping should be insulated to pre-
vent the nuisance of water dripping from the lines. If
insulation is not of the self-contained vapor barrier
type, it should be covered with a moisture seal. Do not
insulate piping until it has been tested for leaks and
drain connections have been extended beyond the pro-
FIGURE NO. 7
TO
.ER
posed insulation thickness to make them accessible.
CHILLED WATER THERMOSTAT
WHR-008A thru 060A - The chilled water thermostat
is mounted inside the control console and the control
bulb, capillary tubing and control bulb immersion well
are attached to the unit with spring clips, The control
bulb well must be field inserted in the first tee install-
ed in the return water line as shown in Figure 7. The
bulb well is supplied with a 1/2" NPT male thread.
Carefully unsnap the well from the holding clips, re- d ?
move the retaining bushing and
slowly
remove the bulb
from the well. Install into piping as indicated in Fig-
ure 7. When installing the bulb, carefully remove it
from the well so as to not wipe off the heat conduct-
ing compound supplied in the well. After installing
the well, carefully insert the bulb and seal in with
the excess compound. Insert the retaining gasket and
sealing bushing and clip or tape the cap tube to the
water line. Care should be taken not to break or kink
the charged capillary tubing. Sufficient cap tube length
is provided for bulb insertion up to 10 feet from the
unit; however, it is recommended that the bulb well
be placed as close to the cooler inlet as possible.
Insulate over thermostat well.
WHR-070A thru 120A - The chilled water thermostat
is mounted inside the control console. The control
bulb is mounted in a well, located in the return water
connection to the unit. Care should be taken not to
kink or break the charged capillary tubing when work-
ing around the unit. It is also advisable to check the
cap tube before running the unit to be sure that it is
firmly anchored and not rubbing on the frame or any
other component.
CAUTION: The thermostat bulb should not be exposed
to water temperatures above 140F since this will
damage the control.
T H E R M O S T A T W E L L I N S T A L L A T I O N
RETURN WATER
N.P.T.
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