ClimateMaster AG series Specifications download pdf (Page 22)

Tranquility

27™ (TT) Series

ClimateMaster: Smart. Responsible. Comfortable.

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).

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).

1.4 3.3 1850 69.3 5.37 51.3 104.7 3.8 7.4

.0 0.0 1850 44.6 4.82 28.8 92.3 2.7 4.9

.0 0.0 2100 45.3 4.67 29.6 90.0 2.8 5.0

3.2 - 1850 49.0 4.89 32.8 94.5 2.9 5.8

3.0 - 2100 49.7 4.74 33.7 91.9 3.1 5.9

4.3 - 1850 51.1 4.94 34.8 95.6 3.0 5.8

4.1 - 2100 51.9 4.78 35.7 92.9 3.2 5.9

5.5 - 1850 52.3 4.96 35.8 96.2 3.1 5.8

5.3 - 2100 53.1 4.81 36.8 93.4 3.2 5.9

3.1 - 1850 56.8 5.06 40.0 98.4 3.3 6.6

2.9 - 2100 57.7 4.90 41.1 95.4 3.4 6.7

4.0 - 1850 59.7 5.13 42.7 99.9 3.4 6.6

3.8 - 2100 60.6 4.97 43.8 96.7 3.6 6.7

5.1 - 1850 61.4 5.17 44.2 100.7 3.5 6.6

4.8 - 2100 62.3 5.01 45.3 97.5 3.6 6.7

0.4 3.6 1850 65.5 5.27 47.9 102.8 3.6 7.4

0.2 3.7 2100 66.5 5.11 49.1 99.3 3.8 7.6

1.2 3.4 2100 70.3 5.21 52.7 101.0 4.0 7.5

2.3 3.1 1850 71.4 5.43 53.2 105.7 3.9 7.4

2.1 3.1 2100 72.5 5.26 54.6 102.0 4.0 7.5

7.5 4.4 1850 74.7 5.52 56.1 107.4 4.0 8.2

7.3 4.4 2100 75.8 5.35 57.6 103.4 4.2 8.3

8 5 4 0 1850 79 2 5 66 60 2 109 7 4 1 8 2

Performance capacities shown in thousands of Btuh

Heating - EAT 70°F

HWC

Airﬂ ow

CFM

HC kW HE LAT COP HWC

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 39 40

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ClimateMaster AG series Specifications Page 22

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