Bryant R-22 Wartungshandbuch PDF herunterladen (Seite 11)

Residential H&V - 60Hz R22

Rev.: 20 July, 2009B

Bryant: Whatever It Takes.

Water Connection Installation

Water Connections-Residential (Distributor) Models

Residential models utilize swivel piping ﬁ ttings for water

connections that are rated for 450 psi (3101 kPa) operating

pressure. The connections have a rubber gasket seal

similar to a garden hose gasket, which when mated to the

ﬂ ush end of most 1” threaded male pipe ﬁ ttings provides

a leak-free seal without the need for thread sealing tape or

joint compound. Insure that the rubber seal is in the swivel

connector prior to attempting any connection (rubber seals

are shipped attached to the swivel connector). DO NOT

OVER TIGHTEN or leaks may occur.

Gasket

Swivel Nut

Stainless steel

snap ring

Brass Adaptor

Hand Tighten

Only!

Do Not

Overtighten!

Figure 11: Water Connections

CAUTION! The following instructions represent industry

accepted installation practices for closed loop earth

coupled heat pump systems. Instructions are provided

to assist the contractor in installing trouble free ground

loops. These instructions are recommendations only.

State/provincial and local codes MUST be followed and

installation MUST conform to ALL applicable codes. It is

the responsibility of the installing contractor to determine

and comply with ALL applicable codes and regulations.

Pre-Installation

Prior to installation, locate and mark all existing underground

utilities, piping, etc. Install loops for new construction before

sidewalks, patios, driveways, and other construction has

begun. During construction, accurately mark all ground loop

piping on the plot plan as an aid in avoiding potential future

damage to the installation.

Piping Installation

The typical closed loop ground source system is shown in

Figure 12. All earth loop piping materials should be limited to

polyethylene fusion only for in-ground sections of the loop.

Galvanized or steel ﬁ ttings should not be used at any time

due to their tendency to corrode. All plastic to metal threaded

ﬁ ttings should be avoided due to their potential to leak in earth

coupled applications. A ﬂ anged ﬁ tting should be substituted.

P/T plugs should be used so that ﬂ ow can be measured using

the pressure drop of the unit heat exchanger.

Earth loop temperatures can range between 25 and

110°F [-4 to 43°C]. Flow rates between 2.25 and 3 gpm

per ton [2.41 to 3.23 l/m per kW] of cooling capacity is

recommended in these applications.

Test individual horizontal loop circuits before backﬁ lling.

Test vertical U-bends and pond loop assemblies prior to

installation. Pressures of at least 100 psi [689 kPa] should be

used when testing. Do not exceed the pipe pressure rating.

Test entire system when all loops are assembled.

Flushing the Earth Loop

Once piping is completed between the unit, Flow Controller

and the ground loop (Figure 12), the loop is ready for ﬁ nal

purging and charging. A ﬂ ush cart with at least a 1.5 hp

[1.1 kW] pump is required to achieve enough ﬂ uid velocity

in the loop piping system to purge air and dirt particles. An

antifreeze solution is used in most areas to prevent freezing.

All air and debris must be removed from the earth loop piping

before operation. Flush the loop with a high volume of water

at a minimum velocity of 2 fps (0.6 m/s) in all piping. The

steps below must be followed for proper ﬂ ushing.

1. Fill loop with water from a garden hose through the

ﬂ ush cart before using the ﬂ ush cart pump to insure an

even ﬁ ll.

2. Once full, the ﬂ ushing process can begin. Do not allow

the water level in the ﬂ ush cart tank to drop below the

pump inlet line to avoid air being pumped back out to

the earth loop.

3. Try to maintain a ﬂ uid level in the tank above the return

tee so that air cannot be continuously mixed back into

the ﬂ uid. Surges of 50 psi (345 kPa) can be used to help

purge air pockets by simply shutting off the return valve

going into the ﬂ ush cart reservoir. This “dead heads”

the pump to 50 psi (345 kPa). To purge, dead head the

pump until maximum pumping pressure is reached.

Open the return valve and a pressure surge will be sent

through the loop to help purge air pockets from the

piping system.

4. Notice the drop in ﬂ uid level in the ﬂ ush cart tank when

the return valve is shut off. If air is adequately purged

GROUND-LOOP HEAT PUMP APPLICATIONS

The female locking ring is threaded onto the pipe threads

which holds the male pipe end against the rubber gasket,

and seals the joint. HAND TIGHTEN ONLY! DO NOT

OVERTIGHTEN!

 CAUTION! 

External Flow Controller Mounting

The Flow Controller can be mounted beside the unit as

shown in Figure 12. Review the Flow Controller installation

manual for more details.

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