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6. Leak test all field weld joints with electronic leak detec-
tors or equivalent. If machine has acquired a leak in ship-
ment or rigging, all joints must be leak tested.
7. After leak testing has been completed and leaks have been
corrected, release the machine pressure.
Table 4 — Quantity of Refrigerant and Nitrogen
Required for Leak Testing
REFRIGERANT 22
(No. of Cylinders)
UNIT
16JB
25 lb
11.3 kg
010
012
1
014
018
1
021
024
2
028
032
2
036
041
4
047
054
4
057
061
5
068
Fig. 5 — Purge Exhaust Assembly
MACHINE EVACUATION — Removal of non-condensables
from the machine is required after machine has been opened.
To evacuate the machine, proceed as follows:
1. Connect auxiliary evacuation device (Fig. 4) to auxiliary
evacuation valve. Be sure that the line is as short as pos-
sible and that line size is not smaller than connection to
auxiliary device. A check valve must be used on the suc-
tion lines to keep vacuum pump oil out of the chiller. Be
sure that all connections are vacuum tight.
2. Close refrigerant pump service valve(s), solution service
valve, auxiliary evacuation valve, and purge exhaust valve.
3. Start auxiliary evacuation device. Open auxiliary evacu-
ation valve. Reduce machine pressure to one in. of mer-
cury absolute or lower. Check pressure with absolute pressure
gage at refrigerant pump service valve.
4. Close auxiliary evacuation valve and shut off auxiliary
evacuation device.
NITROGEN
(No. of Cylinders)
12 lb
300 cu ft vol
5.4 kg
8.5 cu meters
0
1.0
1
1.0
1
2.5
1
2.5
0
3.5
0
3.5
0
4.5
5. Note and record absolute pressure gage reading.
6. Coat all machine field-weld joints with weld sealant.
Step 3 — Connect Piping —
data, piping drawings and procedure outlined below. A typi-
cal piping installation is shown in Fig. 6.
Factory-supplied insulation is not flammable but can be
damaged by welding sparks and open flame. Protect in-
sulation with a wet canvas cover.
1. Make sure connections to water box covers allow re-
moval of covers for maintenance. Install a flange or Vic-
taulic grooved coupling in the piping between the absorber
outlet and condenser outlet.
2. Install pipe hangers where needed. Make sure no weight
or stress is placed on water box nozzles or flanges.
3. Install water box vent and drain piping in accordance with
individual job data. Vent and drain piping shown in Fig. 6
is typical only and may not conform to your arrange-
ment. Air vents should be at all high points in piping to
eliminate water hammer.
4. Install water box drain plugs (shipped with unit).
5. Water flow direction must be as specified in job flow dia-
grams or water flow markings on water boxes.
6. Install 5 thermometer wells and thermometers (not sup-
plied by Carrier). Thermometer wells should extend into
the pipe a minimum of
Area
Entering chilled water
Leaving chilled water
Entering absorber water
Entering condenser water
Leaving condenser water
Step 4 — Install Steam or Hot Water Piping
STEAM MACHINE
1. Locate the steam control valve, a minimum of 3 ft from
the generator nozzle (Fig. 7) and install a pressure gage
between steam control valve and machine.
2. Install the steam trap, as close to the machine as possible
and at least 3 ft below the generator outlet. Piping from
the trap must be located as low as possible to prevent
condensate from backing up into the generator at part load.
When the condensate system is closed, an air vent of some
type must be part of the system. If a condensate receiver
is used, the vent should be part of the tank.
HOT WATER MACHINE
1. Install thermometer wells and connection for pressure gages.
For thorough mixing and temperature stabilization, wells
in leaving water pipe should be placed 6 to 10 pipe di-
ameters from water box and should extend inside the pipe
at least 2 in. (50 mm).
2. Vent rupture discs to the outside of the building for safety.
The 16JB hot water chillers are factory equipped with a
rupture disc assembly on the generator-condenser assem-
bly (see Fig. 1).
a. Add a flexible connection and adequate support to pipe,
as required, to eliminate any piping stress on rupture
disc. Provide fittings so vent piping can be discon-
nected periodically for inspection of disc. Provide pipe
plug on outlet side of relief device for leak testing.
5
Install piping using job
1
⁄
pipe diameter.
3
Suggested Range
0 to 100 F
0 to 100 F
30 to 120 F
30 to 120 F
30 to 180 F
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