Bryant TSTATBBN2S01-C Instrukcja Instalacji Pobierz pdf (Strona 8)

Page 8

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

ﬁ nal ﬂ ush and pressurize the loop to a static pressure of

40-50 psi (winter) 15-20 psi (summer).

After pressurization, be sure to remove the plug in 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

the loop ﬂ ow center provides adequate ﬂ ow through the

unit by checking pressure drop across the heat exchanger

and comparing it to the ﬁ gures shown in Table 11.

Antifreeze

In areas where minimum entering loop temperatures

drop below 40°F or where piping will be routed through

areas subject to freezing, anti-freeze is needed. Alcohols

and glycols are commonly used as antifreezes, however

your local territory manager should be consulted for the

antifreeze best suited to your area. Freeze protection

should be maintained to 15°F below the lowest expected

entering loop temperature. For example, if 30°F is

the minimum expected entering loop temperature,

the leaving loop temperature would be 25-22°F and

freeze protection should be at 15°F (30°F-15°F=15°F).

All alcohols should be premixed and pumped from

a reservoir outside of the building when possible or

introduced under water level to prevent fuming. Initially

calculate the total volume of ﬂ uid in the piping system

using Table 2. Then use the percentage by volume shown

in Table 3 for the amount of antifreeze. Antifreeze

concentration should be checked from a well mixed

sample using a hydrometer to measure speciﬁ c gravity

See Flow Controller IOM for more information.

Freeze Protection Setting

CXM or DXM Control:

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

should be clipped to select the low temperature

(Antifreeze 10°F) setpoint to avoid nuisance faults. See

Freeze Protection Selection. Shut off valves should be

included in case of servicing. Boiler drains or other valves

should be "teeʼd" in the line to allow acid ﬂ ushing of just

the heat exchanger. Pressure temperature plugs should be

used so that ﬂ ow and temperature can be measured. The

water freezestat should be wired. Piping materials should

be limited to PVC SCH80 or copper. Note: Due to the

pressure and temperature extremes, PVC SCH40 is

not recommended.

Figure 10. Typical Closed Loop System.

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