Carrier
ermetic Centrifugal Liquid Chillers
INTRODUCTION
persons concerned with the start-up and
ope^ion of the 19EA machine should understand
thteie instructions and all necessary job data before
initial start-up. Instructions are in proper sequence
for optimum machine performance.
Data and Equipment Required
PRINTS: Machine assembly and
INSTRUCTIONS:
MATERIALS:
wiring,
piping
Starter diagrams
Special controls and related
wiring (if any)
19EA Installation book
19EA Operating and Main
tenance book
Starter Instructions
Mechanics’ tools, electronic or
halide leak detector, clamp-on
ammeter, volt-ohmmeter
INITIAL PREPARATIONS
Machine Tightness — The 19EA is shipped with the
refrigerant charge in the utility vessel and a holding
charge (10 psig) in the unishell. Several levels of
leak testing may be required depending on
condition of machine on arrival and at start-up.
Determine machine condition and follow pro
cedure indicated in Table 1.
For transferring refrigerant and evacuating
vessels, follow the pumpout instructions on pages 3
and 4.
Table 1 — Selection of Leak Test Procedures
MACHINE CONDITION
PROCEDURE
1. Unishell holding charge
and utility vessel refrig
erant level unchanged.
4
2 Unishell holding charge
decreased slightly.
3 and 4 on unishell
3. Utility vessel refrigerant
level decreased slightly.
Leak test with halide or
electronic leak detector.
4. Unishell holding charge
completely gone Opened
valve or other open con
nection suspected.
1
5 Unishell holding charge
completely gone Vessel
leak assumed
'2., 3, and 4 on unishell
6 Refrigerant charge in
utility vessel completely
gone. Opened valve or
, \ other open connection
suspected.
1 - Use nitrogen with
R-12 tracer in pressur
izing for leak test pro
cedures 2 and 3
7 Refrigerant charge in
utility vessel completely
gone. Vessel leak
assumed
2, 3/ and 4 on uti! ity
vessel. Use nitrogen with
R-12 tracer for pressuriz
ing in 2 and 3
Nev«f charge Squid refr^erant into
the unisheii if vessd isressarc is beiow 3S ps^..,
or vtaife water pumps itoi op«ratirig. Cooler tube
freeze-trp and. dam^e may rearlt,
PROCEDURE 1 — Standing Vacuum Test
1. Attach a mercury manometer (absolute
pressure-type) to the refrigerant charging valve,
(6) Fig. 1. A dial-type gage cannot indicate the
small amount of leakage acceptable during a
short period of time.
2. Pull a vacuum on the vessel (see evacuating
procedures on page 3) equal to 25 in. Hg, ref
30-in. bar. (2.5 psia), using the pumpout system
pump.
3. Valve off pump to hold vacuum, and record
manometer reading.
4. If the leakage rate is less than 0.05 in. Hg/24
hours, perform procedure 3, aU steps under
Machine Dehydration and procedure 4.
5. If the leakage rate exceeds 0.05 in. Hg/24
hours, perform procedures 2, 3, all steps under
Machine Dehydration, and procedure 4 in the
order indicated.
6. Remove mercury manometer from refrigerant
charging valve.
PROCEDURE 2 — Follow steps 1 thru 4 of Return
Refrigerant to Normal Operating Conditions, page
3. Raise vessel pressure slowly to 5 psig by cracking
open valve 4. Perform leak test with hahde or
electronic detector and repair any leaks.
PROCEDURE 3 — Following steps 1 thru 5 of
Return Refrigerant to Normal Operating Condi
tions, page 3, raise vessel pressure to 35 psig.
Perform leak test with halide or electronic detector
and repair any leaks.
PROCEDURE 4 — Equalize pressure between
utility vessel and unishell following steps 1 thru 5
of Return Refrigerant to Normal Operating
Conditions, page 3. Vessel pressure will be approxi
mately 70 psig. Perform leak test with halide or
electronic detector and repair any leaks.
If refrigerant charge was lost and nitrogen has
been used for pressurizing in procedures 2 and 3,
evacuate vessel and then charge 400 lb of R-12 for
procedure 4. If vessels are then leak tight, continue
charging refrigerant to the level indicated in
Charging Quantity Table below.
Table 2 — Charging Quantity
MACHINE SIZE
WEIGHT (lb R-12)
19EA 400, 430, 465
19EA 500, 550
19EA 590, 630
2000
2200
2400
Form 1PFA-1.S?;
