Vogt P-24AL, Руководство по обслуживанию

Страница: 37 / 149

P24AL & P34AL Service Manual
INSTALLING YOUR TUBE-ICE MACHINE
12/2016
3-13
cycle is 50%. If the compressor cannot be unloaded, then a hot gas bypass to the suction line must
be installed. See Figures 3-13 through 3-16.
Cooling Tower (optional).
When selecting a cooling tower, careful attention must be given to
operating wet bulb conditions. It is advisable to check with your local cooling tower distributor for
their recommendations based on actual operating conditions in your area. An average wet bulb of
78

F is typical in the U.S., but many localities have designed wet bulbs as low as 72

F or as high as
82

F.
The cooling tower water pump must be capable of delivering the required volume of water through
the condenser. Due to cooling tower location and pressure drop through water lines and regulating
valves, the water pump must be sized for each installation. Table 3-3 shows the total heat rejection
in 1000 BTU’s per hour for the P24AL and P34AL at different suction temperatures. The water
piping for the cooling tower and the installation of the pump must be in accordance with the
manufacturer’s instructions. Caution must be used to prevent the condenser water pump from losing
prime during off cycles.
Proper water treatment for the prevention of mineral and foreign matter accumulation in the
condenser or cooling tower is recommended. A water analysis should be obtained to determine the
proper chemicals to use. The use of a 40-mesh strainer in the condenser water supply line is also
recommended.
P24AL - Cylinder P34AL - Cylinder
Suction
Temperature

F /

C
1”
Tube
1 1/4”
Tube
1 1/2”
Tube
1”
Tube
1 1/4”
Tube
1 1/2”
Tube
21.4 /-6.0 554 512 353 1135 1051 737
16.6 /-8.5 919 853 596 1850 1724 1234
11.3 /-11.5 1420 1324 941 2809 2637 1930
5.5 /-15.7 2120 1987 1440 4121 3901 2926
-1.0 /-18.3 3157 2981 2209 6027 5767 4440
P24AL - Crushed P34AL - Crushed
21.4 /-6.0 722 779 685 1446 1540 1374
16.6 /-8.5 1167 1247 1113 2282 2412 2189
11.3 /-11.5 1754 1858 1685 3356 3522 3248
5.5 /-15.7 2542 2674 2462 4769 4982 4664
-1.0 / -18.3 3668 3840 3589 6758 7040 6685
Total Heat Rejection is based on pulldown of 105

F SDT. Values are nominal based on open
drive reciprocating compressor.
Consult factory for condenser sizing if desired.
Table 3-3
Total Heat Rejection (MBH)
The condenser water pump should be sized on GPM required for condenser at 80 ft. total discharge
head for a typical installation. However, due to cooling tower location and pressure drop through
water lines, the water pump should be sized for each installation.