8
Step 4 —
Mount Unit
The Water to Water series units should be mounted level on a
vibration absorbing pad slightly larger than the base to minimize
vibration transmission to the building structure. It is not necessary
to anchor the unit to the floor.
Step 5 —
Connect Piping
Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs). Never use flexible hoses of
a smaller inside diameter than that of the water connections on the
unit. The water-to-water series units are supplied with either a
copper or optional cupro-nickel condenser. Should your well
driller express concern regarding the quality of the well water
available or should any known hazards exist in your area, Carrier
recommends proper testing to assure the well water quality is
suitable for use with water source equipment. In conditions
anticipating moderate scale formation or in brackish water a
cupro-nickel heat exchanger is recommended.
Both the supply and discharge water lines will sweat if subject to
low water temperature. These lines should be insulated to prevent
damage from condensation.
All manual flow valves used in the system must be ball valves.
Globe and gate valves must not be used due to high pressure drop
and poor throttling characteristics.
Never exceed the recommended water flow rates. Serious damage
or erosion of the water to refrigerant heat exchanger could occur.
Always check carefully for water leaks and repair appropriately.
Units are equipped with female pipe thread fittings. Consult the
specification sheets for sizes. Thread sealant should be used when
connecting water piping connections to the units to ensure against
leaks and possible heat exchanger fouling. Do not overtighten the
connections. Flexible hoses should be used between the unit and
the rigid system to avoid possible vibration. Ball valves should be
installed in the supply and return lines for unit isolation and unit
flow balancing.
WATER SUPPLY AND QUALITY
Check water supply. Water supply should be plentiful and of good
quality. See Table 3 for water quality guidelines.
In all applications, the quality of the water circulated through the
heat exchanger must fall within the ranges listed in the Water
Quality Guidelines table. Consult a local water treatment firm,
independent testing facility, or local water authority for specific
recommendations to maintain water quality within the published
limits.
COOLING TOWER/BOILER APPLICATION
To assure adequate cooling and heating performance, the cooling
tower and boiler fluid loop temperature should be maintained
between 50°F and 100°F. In the cooling mode, heat is rejected
from the unit into the condenser water loop. A cooling tower
provides evaporative cooling to the loop water; thus, maintaining
a constant supply temperature to the unit. When utilizing an open
cooling tower, chemical water treatment is mandatory to ensure
the water is free of corrosive materials. A secondary heat
exchanger (plate frame between the unit and the open cooling
tower) may also be used. It is imperative that all air is eliminated
from the closed loop side of the heat exchanger to prevent
condenser fouling. (See Fig. 5.)
In the heating mode, heat is absorbed from the condenser water
loop to the unit. A boiler can be utilized to maintain the loop
within the proper temperature range. In milder climates a “flooded
tower” concept is often used. This concept involves adding
make-up water to the cooling tower sump to maintain the desired
loop temperature. No unit should be connected to the supply or
return piping until the water system has been completely cleaned
and flushed to remove any dirt, piping chips or other foreign
material. Supply and return hoses should be connected together
during this process to ensure the entire system is properly flushed.
After the cleaning and flushing has taken place, the unit may be
connected to the water loop and should have all valves wide open.
Pressure/temperature ports are recommended in both the supply
and return lines for systen flow balancing. Water flow can be
accurately set by measuring the refrigerant-to-water heat
exchangers water side pressure drop.
WELL WATER SYSTEMS
Water quantity should be plentiful, between 1.5 and 2.5 gpm per
ton of cooling, and of good quality. To avoid the possibility of
freezing the well water should be above 50°F. (See Fig. 6.)
Water pressure must always be maintained in the heat exchanger
by placing a water control valve on the outlet of the water-to-water
unit. A bladder type expansion tank may be used to maintain
pressure on the system.
Avoid using low voltage (24 volt) solenoids, using them may
overload the unit transformer or interfere with the lock-out circuit.
Line voltage solenoids connected across the load side (T1, T2) of
the compressor contactor are preferred.
Pilot operated or slow closing valves are recommended to reduce
water hammer.
The discharge water from the water-to-water unit is not
contaminated in any manner and can be disposed of in various
ways depending on the local codes (i.e. discharge well, dry well,
storm sewer, drain field, stream, pond, etc.)
EARTH COUPLED GEOTHERMAL SYSTEMS
Closed loop and pond applications require specialized design
knowledge. No attempt at these installations should be made
unless the dealer has received specialized training.
Utilizing the Ground Loop Pumping Package (GLP), makes the
installation easy. Anti-freeze solutions are utilized when entering
loop temperatures drop below 40°F or where piping will be routed
through areas subject to freezing. A flow rate between 2.5 to
3.0 gpm per nominal ton of cooling is recommended for this
application. (See Fig. 7.)
CAUTION
Galvanized pipe or fittings are not recommended for use with
these units due to the possible galvanic corrosion.
CAUTION
Improper heat exchanger fluid flow due to piping, valving or
improper pump operation is hazardous to the unit and
constitutes abuse which will void the heat exchanger and
compressor warranty.
IMPORTANT: Failure to comply with the above required
water quality and quantity limitations and the closed-system
application design requirements may cause damage to the
tube-in-tube heat exchanger that is not the responsibility of the
manufacturer.
Summary of Contents for Aquazone 50PSW025
Page 15: ...15 Fig 9 Unit Size 122 1 Phase Complete C Deluxe D Control Package DWG No 50PSW120000 Rev 3 ...
Page 17: ...17 Fig 11 Unit Sizes 122 1 Phase W2W Open Control Package DWG No 50PSW120001 Rev 4 ...
Page 21: ...21 Fig 15 Unit Size 122 240 420 3 Phase W2W Open Control Package DWG No 50PSW320001 Rev 3 ...
Page 36: ...36 Fig 22 W2W Open Control Board ...
Page 37: ...37 Fig 23 Unit Protection Module UPM Sequence Of Operation ...