17
CHARGING COOLING ONLY SYSTEMS
After start-up, allow the system to operate for approxi-
mately 30 minutes in order to establish stable operating
conditions. Check that the temperature drop across the
evaporator coil is 20°F to 30°F. Do not attempt to adjust
the charge at ambient temperatures below 65°F.
1. Check refrigerant charge by measuring liquid subcool-
ing. Subcooling should be approximately 10°F to 13°F. If
a sight glass has been installed on the liquid line at the
fan coil unit check for the presence of flashing.
2. If the subcooling is below 10°F, add refrigerant gas to
the suction line service port. Watch pressure gauge and
thermometer for correct subcooling. It should be approxi-
mately 10°F to 13°F.
3. If subcooling is too high, slowly bleed refrigerant from
suction line service port into an appropriate refrigerant
recovery device. Watch prssure gauge and thermometer
for correct subcooling (10°F to 13°F).
Releasing refrigerant gas into the
atmosphere is a criminal offense.
FACTORS AFFECTING THE BALANCE OF
THE SYSTEM
A. Room Terminators (Outlets): Based on the equipment
selected, determine the recommended number of
fully open outlets from Figure 3.1.
FIGURE 3.1
1. The minimum or recommended number of outlets
means fully open outlets. Any outlet having an orifice
would be only a percentage of an outlet.
2. For systems with average supply tubing lengths of 15
feet or less, use column A. For systems with supply tubing
lengths greater than 15 feet, use column B.
NOTICE: The number of outlets and average length of
the supply tubing has a significant effect on the over-
all system performance. It is highly recommended that
the adjustment factors outlined in the SpacePak
Application Manual are accounted for prior to any
installation.
B. Orifice Combinations: Should orifices be required to
balance the system (installed at plenum take-off),
refer to the combinations listed in Figure 3.2
FIGURE 3.2
*For a room with more than two (2) terminals, combinations of
the above may be used to achieve the desired fractional number.
C. Supply Tubing Length: An outlet with a supply
tubing length of 15 feet is considered one, fully
opened outlet. For other lengths refer to Figure 3.3 for
adjustment factors.
FIGURE 3.3
.
NOMINAL
TONNAGE
2
2-1/2
3
3-1/2
4
5
MODEL
ESP-2430V
ESP-2430V
ESP-3642V
ESP-3642V
ESP-4860V
ESP-4860V
A
12
15
18
21
26
30
MINIMUM RECOMMENDED
NUMBER OF FULLY OPEN OUTLETS
2" SUPPLY TUBING LENGTH ADJUSTMENT FACTOR CHART
RUN
6'
8'
10'
12'
15'
20'
25'
30'
FACTOR
.85
.88
.90
.94
1.0
1.1
1.25
1.50
B
14
18
21
25
28
35
DESIRED NUMBER
OF TERMINALS*
.5
.65
.85
1.00
1.15
1.30
1.50
1.65
1.70
1.80
1.85
1.95
2.00
TERMINAL - ORIFICE
COMBINATION
(1) .5
(1) .35
(1) .15
(1)
(1) .5 + (1) .35
(2) .35
(1) .35 + (1) .15 or (1) + (1) .5 or (3) .5
(1) + (1) .35 or (2) .5 + (1) .35
(2) .15
(2) .35 + (1) .5
(1) + (1) .15
(3) .35
(2)
Содержание ESPV2-109
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