ClimateMaster DC Series Installation Manual download pdf (Page 12)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

Ground-Loop Heat Pump Applications

Table 2: Antifreeze Percentages by Volume

Low Water Temperature Cutout Setting

CXM or DXM Control

When antifreeze is selected, the FP1 jumper (JW3) should

be clipped to select the low temperature (antifreeze 13°F

[-10.6°C]) set point and avoid nuisance faults (see “Low

Water Temperature Cutout Selection” in this manual). NOTE:

Low water temperature operation requires extended range

equipment.

from the system, the level will drop only 1-2 inches (2.5

- 5 cm) in a 10” (25 cm) diameter PVC ﬂ ush tank (about a

half gallon [2.3 liters]), since liquids are incompressible. If

the level drops more than this, ﬂ ushing should continue

since air is still being compressed in the loop ﬂ uid.

Perform the “dead head” procedure a number of times.

Note: This ﬂ uid level drop is your only indication of

air in the loop.

5. Consult ClimaDry AOM for ﬂ ushing instructions for units

equipped with ClimaDry Whole House Dehumidiﬁ cation

option.

Antifreeze may be added before, during or after the ﬂ ushing

procedure. However, depending upon which time is chosen,

antifreeze could be wasted when emptying the ﬂ ush cart

tank. See antifreeze section for more details.

Loop static pressure will ﬂ uctuate with the seasons.

Pressures will be higher in the winter months than during

the cooling season. This ﬂ uctuation is normal and should

be considered when charging the system initially. Run the

unit in either heating or cooling for a number of minutes to

condition the loop to a homogenous temperature. This is

a good time for tool cleanup, piping insulation, etc. Then,

perform ﬁ nal ﬂ ush and pressurize the loop to a static

pressure of 50-75 psi [345-517 kPa] (winter) or 35-40 psi

[241-276 kPa] (summer). After pressurization, be sure to

loosen the plug at the end of the Grundfos loop pump

motor(s) to allow trapped air to be discharged and to insure

the motor housing has been ﬂ ooded. This is not required

for Taco circulators. Insure that the Flow Controller provides

adequate ﬂ ow through the unit by checking pressure drop

across the heat exchanger and compare to the pressure

drop tables at the back of the manual.

Antifreeze

In areas where minimum entering loop temperatures drop

below 40°F [5°C] or where piping will be routed through

areas subject to freezing, antifreeze is required. Alcohols

and glycols are commonly used as antifreeze; however

your local sales manager should be consulted for the

antifreeze best suited to your area. Freeze protection should

be maintained to 15°F [9°C] below the lowest expected

entering loop temperature. For example, if 30°F [-1°C] is the

minimum expected entering loop temperature, the leaving

loop temperature would be 25 to 22°F [-4 to -6°C] and freeze

protection should be at 15°F [-10°C]. Calculation is as

follows:

30°F - 15°F = 15°F [-1°C - 9°C = -10°C].

All alcohols should be premixed and pumped from a

reservoir outside of the building when possible or introduced

under the water level to prevent fumes. Calculate the

total volume of ﬂ uid in the piping system. Then use the

percentage by volume shown in Table 1 for the amount

of antifreeze needed. Antifreeze concentration should be

checked from a well mixed sample using a hydrometer to

measure speciﬁ c gravity.

Table 1: Approximate Fluid Volume (gal.) per 100' of Pipe

Type

Minimum Temperature for Low Temperature Protection

10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]

Methanol

100% USP food grade Propylene Glycol

Ethanol*

25%

38%

29%

21%

25%

16%

22%

20%

10%

15%

14%

* Must not be denatured with any petroleum based product

Fluid Volume (gal [liters] per 100’ [30 meters) Pipe)

Pipe Size Volume (gal) [liters]

Copper

1” 4.1 [15.3]

1.25” 6.4 [23.8]

2.5” 9.2 [34.3]

Rubber Hose 1” 3.9 [14.6]

Polyethylene

3/4” IPS SDR11 2.8 [10.4]

1” iPS SDR11 4.5 [16.7]

1.25” IPS SDR11 8.0 [29.8]

1.5” IPS SDR11 10.9 [40.7]

2” IPS SDR11 18.0 [67.0]

1.25” IPS SCH40 8.3 [30.9]

1.5” IPS SCH40 10.9 [40.7]

2” IPS SCH40 17.0 [63.4]

Unit Heat Exchanger Typical 1.0 [3.8]

Flush Cart Tank

10” Dia x 3ft tall

[254mm x 91.4cm tall]

10 [37.9]

Section 10 - Packaged IOM 12 4/24/09 3:16:50 PM

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ClimateMaster DC Series Installation Manual Page 12

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