Bryant TSTATBBN2S01-C Instalační manuál stáhnout pdf (Strana 21)

Residential H&V - 60Hz R22 & R410A - Geothermal Heat Pumps - Rev.: 21 Aug, 2007D

WATER CONNECTION INSTALLATION

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.

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

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!

ѥ CAUTION! ѥ

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