51
R e s i d e n t i a l D i g i t a l H & V - Tr a n q u i l i t y
®
2 2 D i g i t a l ( T Z ) S e r i e s - 6 0 H z H F C - 4 1 0 A
C r e a t e d : 2 6 O c t . , 2 0 1 1 B
c l i m a t e m a s t e r. c o m
Performance Data Selection Notes
For operation in the shaded area when water is used in
lieu of an anti-freeze solution, the LWT (Leaving Water
Temperature) must be calculated. Flow must be maintained
to a level such that the LWT is maintained above 40°F [4.4*C]
when the JW3 jumper is not clipped (see example below).
Otherwise, appropriate levels of a proper anti-freeze should
be used in systems with leaving water temperatures of 40°F
or below and the JW3 jumper should be clipped. This is due
to the potential of the refrigerant temperature being as low
as 32°F [0°C] with 40°F [4.4°C] LWT, which may lead to a
nuisance cutout due to the activation of the Low Temperature
Protection. JW3 should never be clipped for standard range
equipment or systems without antifreeze.
Example:
At 50°F EWT (Entering Water Temperature) and 1.5 gpm/
ton, a 3 ton unit has a HE of 22,500 Btuh. To calculate LWT,
rearrange the formula for HE as follows:
HE = TD x GPM x 500, where HE = Heat of Extraction (Btuh);
TD = temperature difference (EWT - LWT) and GPM = U.S.
Gallons per Minute.
TD = HE/(GPM x 500)
TD = 22,500/(4.5 x 500)
TD = 10°F
LWT = EWT - TD
LWT = 50 - 10 = 40°F
In this example, as long as the EWT does not fall below 50°F, the system will operate as designed. For EWTs below 50°F,
higher
fl
ow rates will be required (open loop systems, for example, require at least 2 gpm/ton when EWT is below 50°F).
Performance capacities shown in thousands of Btuh
M
WPD
CFM
Heating - EAT 70°F
PSI
FT
HD
HC KW COP
LOOP
∆
T
HE
AIR
∆
T
HWG
CAP
7.0
16.1
1900
11.4
26.4
1900
18.8
43.4
1900
41.4
3.9
3.1
3.7
28.1
18.1
4.6
5.4
12.4
1900
45.3
4.0
3.3
8.5
31.7
20.0
4.6
9.5
21.8
1900
47.2
4.0
3.4
5.9
33.4
20.9
4.7
16.2
37.4
1900
48.2
4.1
3.5
4.6
34.3
21.4
4.8
4.4
10.1
1900
51.5
4.1
3.6
10.0
37.4
23.1
4.9
8.1
18.7
1900
53.7
4.2
3.7
7.0
39.3
24.1
5.1
14.3
32.9
1900
54.8
4.2
3.8
5.4
40.4
24.7
5.2
3.8
8.7
1900
57.6
4.3
3.9
11.5
43.0
26.0
5.4
7.2
16.6
1900
60.1
4.4
4.0
8.0
45.2
27.2
5.6
12.8
29.6
1900
61.4
4.4
4.1
6.2
46.4
27.8
5.7
3.4
8.0
1900
63.7
4.5
4.2
12.9
48.5
29.0
6.0
6.6
15.3
1900
66.4
4.5
4.3
9.1
50.9
30.3
6.1
11.8
27.2
1900
67.8
4.6
4.4
7.0
52.2
31.0
6.3
3.3
7.7
1900
69.6
4.6
4.4
14.4
53.9
31.9
6.6
6.3
14.5
1900
72.6
4.7
4.5
10.1
56.6
33.3
6.7
11.1
25.5
1900
74.1
4.7
4.6
7.7
58.0
34.1
6.9
3.3
7.6
1900
75.5
4.8
4.6
15.8
59.2
34.7
7.2
6.1
14.1
1900
78.6
4.9
4.7
11.0
62.0
36.2
7.4
