Carrier Aquazone 50WD handleiding
Handleiding
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49
System Flushing and Filling
Once the piping is complete, units require final purging and loop
charging. A flush cart pump of at least 1.5 hp is needed to achieve
adequate flow velocity in the loop to purge air and dirt particles
from the loop. Flush the loop in both directions with a high
volume of water at a high velocity. Follow the steps below to
properly flush the loop:
1. Verify power is off.
2. Fill loop with water from hose through flush cart before using
flush cart pump to ensure an even fill. Do not allow the water
level in the flush cart tank to drop below the pump inlet line
to prevent air from filling the line.
3. Maintain a fluid level in the tank above the return tee to avoid
air entering back into the fluid.
4. Shutting off the return valve that connects into the flush cart
reservoir will allow 50 psig surges to help purge air pockets.
This maintains the pump at 50 psig.
5. To purge, keep the pump at 50 psig until maximum pumping
pressure is reached.
6. Open the return valve to send a pressure surge through the
loop to purge any air pockets in the piping system.
7. A noticeable drop in fluid level will be seen in the flush cart
tank. This is the only indication of air in the loop.
NOTE: If air is purged from the system while using a 10 in.
PVC flush tank, the level drop will only be 1 to 2 in. since liq-
uids are incompressible. If the level drops more than this,
flushing should continue since air is still being compressed in
the loop. If level is less than 1 to 2 in., reverse the flow.
8. Repeat this procedure until all air is purged.
9. Restore power.
Antifreeze may be added before, during or after the flushing pro-
cess. However, depending on when it is added in the process, it
can be wasted. Refer to the Antifreeze section on page 51 for more
detail.
Loop static pressure will fluctuate with the seasons. Pressures will
be higher in the winter months than during the warmer months.
This fluctuation is normal and should be considered when
charging the system initially. Run the unit in either heating or
cooling for several minutes to condition the loop to a
homogeneous temperature.
When complete, perform a final flush and pressurize the loop to a
static pressure of 40 to 50 psig for winter months or 15 to 20 psig
for summer months.
After pressurization, be sure to remove the plug from the end of
the loop pump motor(s) to allow trapped air to be discharged and
to ensure the motor housing has been flooded. Be sure the loop
flow center provides adequate flow through the unit by checking
pressure drop across the heat exchanger. Compare the results to
the data in Fig. 43 and 44.
System Flow
FLOW VERIFICATION
The 50WD WSHP units ordered without a factory-installed water
flow switch as standard. It is recommend to provide field-installed
water flow switch or order the unit with factory-installed water
flow switch to prevent the compressor from operating without
loop flow.
FLOW REGULATION
Flow regulation can be accomplished by two methods. Most water
control valves have a flow adjustment built into the valve. By
measuring the pressure drop through the unit heat exchanger, the
flow rate can be determined. Adjust the water control valve until
the desired flow rate is achieved. Since the pressure constantly
varies, two pressure gauges may be needed in some applications.
See Fig. 43 and 44 for waterside pressure drop.
An alternate method of flow regulation is to install an automatic
flow control valve. These valves feature a removable cartridge
that controls the maximum flow through the valve assembly.
Verify that the water flow control cartridge matches the
application flow requirement.
IMPORTANT: It is recommended to have a flow switch to pre-
vent the unit from running if water flow is lost.
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Productinformatie
| Merk | Carrier |
| Model | Aquazone 50WD |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 15865 MB |
