24
FACTORS AFFECTING THE BALANCE OF THE SYSTEM
A. Room Terminators (Outlets): Based on the equip-
ment 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
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
D
ESIRED NUMBER
O
F TERMINALS *
T
ERMINAL - ORIFICE
C
OMBINATION
.5
.65
.85
1
.00
1.15
1.30
1.50
1.65
1.70
1.80
1.85
1.95
(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
2.00 (2)
* For a room with more than two (2) terminals, combinations of the above
may be used to achieve the desired fractional number.
NOMINAL
T ONN A G E
MODEL
WCSP-2430J
WCSP-2430J
WCSP-3642J
WCSP-3642J
WCSP-4860J
WCSP-4860J
2
2 1/2
3
3 1/2
4
5
A B
14
18
21
25
28
35
MINIMUM RECOMMENDED
NUMBER OF FUL L Y OPEN OUTLETS
12
15
18
21
26
30
CONDITION VERIFICATION SOLUTION
A. Lack of cooling 1. Chilled water loop temperature 1. Adjust water temperature in chilled water loop
B
. Lack of heating 1. Hot water loop temperature 1. Adjust water temperature in hot water loop
C. Blows cold air on 1. Fan is controlled by a thermostat 1. Install aquastat
initial start-up 2. Fan is controlled by an aquastat 2. Adjust setting to allow water loop to reach
proper temperature
D. Condensate does 1. Unit is not level 1. Make sure unit is level
not drain properly 2. Unit is not trapped 2. Install trap supplied with unit
3. Drain line is blocked 3. Clear blockage
E. Unit sweats inside 1. Insulated panels not secured 1. Secure and seal all insulated panels to prevent
cabinet air infiltration
C
OMMON START-UP CONDITIONS
2" SUPPLY TUBING LENGTH ADJUSTMENT FACTOR CHART
RUN 6' 8' 10' 12' 15' 20' 25' 30'
FACTOR 1.18 1.14 1.11 1.06 1.0 .9 .8 .66
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