Carrier 30HH - Manual (Page 14)

30HH,HJ
INSTALLATION
Drain Connection
Drain connections are generally governed by
local codes. Water leaving the condenser is
under pressure and should not be connected
directly into sewer lines; otherwise water may
back up into other fixtures. Local codes nor­
mally
require connections similar to the one
shown in Fig. 17.
COOLER WATER PIPING
The cooler of each liquid chilling package is pro­
vided with stubouts for chilled water piping con­
nections. The water outlet stubout is provided
with a 90 degree elbow which contains the chilled
water
safety thermostat bulb. Holes are pro­
vided in both of the side panels for piping to the
stubouts.
The chilled water temperature controller is
mounted on the front of the unit and has the con­
trol bulb and capillary tubing wrapped and taped
before shipping. It is required that the control
bulb be field inserted in the chilled water line.
It usually is inserted in the return or inlet chilled
water piping. Figure 18 shows a typical chilled
water piping arrangement in the vicinity of the
cooler.
Details of the required remote chilled
water piping are outlined in the Carrier System
Design Manual, Part 3, "Piping Design."
Plan the piping so it has a minimum number of
changes in elevation. A manual or automatic
Fig. 17 - Drain Connections
vent-valve must be installed at the high points
in the line to permit venting of air from the
chilled
water circuit. Standard practice for in­
stalling forced water systems must be followed.
System pressures may be maintained by using a
pressure tank or a combination relief valve and
reducing valve.
It is recommended that thermometers be in­
stalled in entering and leaving chilled liquid
lines. Provide drain connections at all low points
to permit complete drainage of the system. A
chiller drain shut-off valve should be connected
to the chiller drain line before placing the unit
in operation (Fig. 18).
Insulate piping to prevent heat loss and sweating.
Cover the insulation with a moisture seal. Do
not insulate piping before all leak testing has
been completed.
Fig. 18 - Cooler Water Piping, Front View
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