101
subtraction of water or temperature expansion/contraction).
The pressure at this point remains the same regardless of
whether or not the pump is running.
Since the expansion tank acts as a reference point for the
pump, there cannot be two reference points (two expansion
tanks) in a system, unless manifolded together as seen in
Fig. 36. It is permissible to install the expansion tank(s) in a
portion of the return water line that is common to all pumps,
providing that the tank is properly sized for combined system
volume.
If the application involves two or more chillers in a primary-
secondary system, a common place for mounting the expan-
sion tank is in the chilled water return line, just before the
decoupler. See Fig. 36 for placement of expansion tank in
primary-secondary systems.
If a diaphragm expansion tank is utilized (a flexible diaphragm
physically separates the water/air interface) it is not recom-
mended to have any air in the water loop. See the section on air
separation on page 95 for instructions on providing air separa-
tion equipment.
FILLING THE SYSTEM — The initial fill of the chilled
water system must accomplish three goals:
1. The entire piping system must be filled with water.
2. The pressure at the top of the system must be high enough
to vent air from the system (usually 4 psig [27.6 kPa] is
adequate for most vents).
3. The pressure at all points in the system must be high
enough to prevent flashing in the piping or cavitation in
the pump.
The pressure created by an operating pump affects system
pressure at all points except one — the connection of the
expansion tank to the system. This is the only location in the
system where pump operation will not give erroneous pressure
indications during the fill. Therefore, the best location to install
the fill connection is close to the expansion tank. An air vent
should be installed close by to help eliminate air that enters
during the fill procedure.
When filling the system, ensure the following:
1. Remove temporary bypass piping and cleaning/flushing
equipment.
2. Check to make sure all drain plugs are installed.
Normally, a closed system needs to be filled only once. The
actual filling process is a fairly simple procedure. All air
should be purged or vented from the system. Thorough venting
at high points and circulation at room temperature for several
hours is highly recommended.
NOTE: Local codes concerning backflow devices and other
protection of the city water system should be consulted and
followed to prevent contamination of the public water supply.
This is critical when antifreeze is used in the system.
SET WATER FLOW RATE — Once the system is cleaned,
pressurized, and filled, the flow rate through the chiller needs
to be established. Follow the manufacturer’s recommendations
for setting the balancing valve. Local codes may prohibit re-
stricting the amount of water using the balancing valve for a
given motor horsepower.
NOTE: Carrier recommends a differential pressure gage when
measuring pressures across the pumps or balancing valves.
This provides for greater accuracy and reduces error build-up
that often occurs when subtracting pressures made by different
gages.
A rough estimate of water flow can also be obtained from the
pressure gages across the 30XV heat exchanger.
The Controls, Start-Up Operation, Service, and Troubleshoot-
ing guide includes graphs that show the relationship between
gpm and heat exchanger pressure drop. It should be noted that
these curves are for fresh water and “clean” heat exchangers;
they do not apply to heat exchangers with fouling.
FREEZE PROTECTION — The 30XV units with Green-
speed
®
intelligence are provided with a flow switch to protect
against freezing situations that occur from no water flow.
While the flow switch is helpful in preventing freezing during
no-flow situations, it does not protect the chiller in case of
power failure during sub-freezing ambient temperatures, or in
other cases where water temperature falls below the freezing
mark. Appropriate concentrations of inhibited propylene or
ethylene glycol or other suitable inhibited antifreeze solution
should be considered for chiller protection where ambient tem-
peratures are expected to fall below 32
F (0°C). Consult a local
water treatment specialist on characteristics of the system water
and add a recommended inhibitor to the chilled water. The Car-
rier warranty does not cover damage due to freezing.
NOTE: Do not use automobile anti-freeze, or any other fluid
that is not approved for heat exchanger duty. Only use
appropriately inhibited glycols, concentrated to provide ade-
quate protection for the temperature considered.
Use electric heater tape for the external piping, if unit will be
exposed to freezing temperatures and is not protected with a
suitable antifreeze solution.
For units equipped with evaporator heaters, ensure that power
is available to the chiller at all times, even during the off-sea-
son, so that the evaporator heaters have power. Also make sure
that the piping heater tape has power.
Units with evaporator heaters are protected from freezing
down to 0°F (–18
C) through the evaporator heaters and con-
trol algorithms. If the unit controls the chilled water pump and
valves, allowing flow through the evaporator, the unit is pro-
tected from freezing down to –20
F (–29
C). The Carrier war-
ranty does not cover damage due to freezing.
PREPARATION FOR WINTER SHUTDOWN — If the unit
is not operational during the winter months, at the end of cooling
season complete the following steps.
1. If the evaporator will not be drained, do not shut off pow-
er disconnect during off-season shutdown. If evaporator
is to be drained, first open the circuit breaker for the heat-
er, CB-7, or shut off power during off-season shutdown.
2. Draining the fluid from the system is highly recom-
mended. Units have a drain plug mounted on the bottom
of the evaporator head at each end of the evaporator.
3. Isolate the evaporator from the rest of the system with
water shutoff valves.
4. Replace the drain plug and completely fill the evaporator
with a mixture of water and a suitable corrosion-inhibited
anti-freeze solution such as propylene glycol. The con-
centration should be adequate to provide freeze protec-
tion to 15°F (8.3°C) below the expected low ambient
temperature conditions. Antifreeze can be added through
the vent on top of the evaporator head.
5. Leave the evaporator filled with the antifreeze solution
for the winter, or drain antifreeze solution if desired. Be
sure to deenergize heaters (if installed) as explained in
Step 1 to prevent damage if the evaporator is drained. Use
an approved method of disposal when removing anti-
freeze solution.
CAUTION
Failure to remove power before draining heater equipped
evaporators can result in heater damage.
Summary of Contents for 30XV140-500
Page 5: ...5 Fig 2 30XV 140 160 180 Std Tier 140 Mid Tier Air Cooled Chiller...
Page 6: ...6 Fig 2 30XV 140 160 180 Std Tier 140 Mid Tier Air Cooled Chiller cont...
Page 7: ...7 Fig 2 30XV 140 160 180 Std Tier 140 Mid Tier Air Cooled Chiller cont...
Page 8: ...8 Fig 3 30XV 140 High Tier 160 180 Mid Tier 200 Std Tier Air Cooled Chiller...
Page 9: ...9 Fig 3 30XV 140 High Tier 160 180 Mid Tier 200 Std Tier Air Cooled Chiller cont...
Page 10: ...10 Fig 3 30XV 140 High Tier 160 180 Mid Tier 200 Std Tier Air Cooled Chiller cont...
Page 11: ...11 Fig 4 30XV 160 180 High Tier 200 Mid Tier Air Cooled Chiller...
Page 12: ...12 Fig 4 30XV 160 180 High Tier 200 Mid Tier Air Cooled Chiller cont...
Page 13: ...13 Fig 4 30XV 160 180 High Tier 200 Mid Tier Air Cooled Chiller cont...
Page 14: ...14 Fig 5 30XV 200 High Tier Air Cooled Chiller...
Page 15: ...15 Fig 5 30XV 200 High Tier Air Cooled Chiller cont...
Page 16: ...16 Fig 5 30XV 200 High Tier Air Cooled Chiller cont...
Page 17: ...17 Fig 6 30XV 225 Std Tier Air Cooled Chiller...
Page 18: ...18 Fig 6 30XV 225 Std Tier Air Cooled Chiller cont...
Page 19: ...19 Fig 6 30XV 225 Std Tier Air Cooled Chiller cont...
Page 20: ...20 Fig 7 30XV 225 Mid Tier Air Cooled Chiller...
Page 21: ...21 Fig 7 30XV 225 Mid Tier Air Cooled Chiller cont...
Page 22: ...22 Fig 7 30XV 225 Mid Tier Air Cooled Chiller cont...
Page 23: ...23 Fig 8 30XV 225 High Tier Air Cooled Chiller...
Page 24: ...24 Fig 8 30XV 225 High Tier Air Cooled Chiller cont...
Page 25: ...25 Fig 8 30XV 225 High Tier Air Cooled Chiller cont...
Page 26: ...26 Fig 9 30XV 250 275 Std Tier Air Cooled Chiller...
Page 27: ...27 Fig 9 30XV 250 275 Std Tier Air Cooled Chiller cont...
Page 28: ...28 Fig 9 30XV 250 275 Std Tier Air Cooled Chiller cont...
Page 29: ...29 Fig 10 30XV 250 275 Mid Tier 300 Std Tier Air Cooled Chiller...
Page 30: ...30 Fig 10 30XV 250 275 Mid Tier 300 Std Tier Air Cooled Chiller cont...
Page 31: ...31 Fig 10 30XV 250 275 Mid Tier 300 Std Tier Air Cooled Chiller cont...
Page 32: ...32 Fig 11 30XV 250 275 High Tier 300 Mid Tier 325 Std Tier Air Cooled Chiller...
Page 33: ...33 Fig 11 30XV 250 275 High Tier 300 Mid Tier 325 Std Tier Air Cooled Chiller cont...
Page 34: ...34 Fig 11 30XV 250 275 High Tier 300 Mid Tier 325 Std Tier Air Cooled Chiller cont...
Page 35: ...35 Fig 12 30XV 300 High Tier 325 Mid Tier Air Cooled Chiller...
Page 36: ...36 Fig 12 30XV 300 High Tier 325 Mid Tier Air Cooled Chiller cont...
Page 37: ...37 Fig 12 30XV 300 High Tier 325 Mid Tier Air Cooled Chiller cont...
Page 38: ...38 Fig 13 30XV 325 High Tier Air Cooled Chiller...
Page 39: ...39 Fig 13 30XV 325 High Tier Air Cooled Chiller cont...
Page 40: ...40 Fig 13 30XV 325 High Tier Air Cooled Chiller cont...
Page 41: ...41 Fig 14 30XV 350 Standard Tier Air Cooled Chiller...
Page 42: ...42 Fig 14 30XV 350 Standard Tier Air Cooled Chiller cont...
Page 43: ...43 Fig 14 30XV 350 Standard Tier Air Cooled Chiller cont...
Page 44: ...44 Fig 15 30XV 350 Mid Tier Air Cooled Chiller...
Page 45: ...45 Fig 15 30XV 350 Mid Tier Air Cooled Chiller cont...
Page 46: ...46 Fig 15 30XV 350 Mid Tier Air Cooled Chiller cont...
Page 47: ...47 Fig 16 30XV 350 High Tier Air Cooled Chiller...
Page 48: ...48 Fig 16 30XV 350 High Tier Air Cooled Chiller cont...
Page 49: ...49 Fig 16 30XV 350 High Tier Air Cooled Chiller cont...
Page 50: ...50 Fig 17 30XV 400 Standard Tier Air Cooled Chiller...
Page 51: ...51 Fig 17 30XV 400 Standard Tier Air Cooled Chiller cont...
Page 52: ...52 Fig 17 30XV 400 Standard Tier Air Cooled Chiller cont...
Page 53: ...53 Fig 18 30XV 400 Mid 450 Standard Tier Air Cooled Chiller...
Page 54: ...54 Fig 18 30XV 400 Mid 450 Standard Tier Air Cooled Chiller cont...
Page 55: ...55 Fig 18 30XV 400 Mid 450 Standard Tier Air Cooled Chiller cont...
Page 56: ...56 Fig 19 30XV 400 High 450 Mid 500 Std Tier Air Cooled Chiller...
Page 57: ...57 Fig 19 30XV 400 High 450 Mid 500 Std Tier Air Cooled Chiller cont...
Page 58: ...58 Fig 19 30XV 400 High 450 Mid 500 Std Tier Air Cooled Chiller cont...
Page 59: ...59 Fig 20 30XV 450 High 500 Mid Tier Air Cooled Chiller...
Page 60: ...60 Fig 20 30XV 450 High 500 Mid Tier Air Cooled Chiller cont...
Page 61: ...61 Fig 20 30XV 450 High 500 Mid Tier Air Cooled Chiller cont...
Page 62: ...62 Fig 21 30XV Split Unit 40A B High 45A B Mid 50A B Standard Tier Air Cooled Chiller...
Page 63: ...63 Fig 21 30XV Split Unit 40A B High 45A B Mid 50A B Standard Tier Air Cooled Chiller cont...
Page 64: ...64 Fig 21 30XV Split Unit 40A B High 45A B Mid 500A B Standard Tier Air Cooled Chiller cont...
Page 65: ...65 Fig 22 30XV Split Unit 45A B High 50A B Mid Tier Air Cooled Chiller...
Page 66: ...66 Fig 22 30XV Split Unit 45A B High 50A B Mid Tier Air Cooled Chiller cont...
Page 67: ...67 Fig 22 30XV Split Unit 45A B High 50A B Mid Tier Air Cooled Chiller cont...
Page 103: ...103 Fig 44 Field Control and Power Wiring...
Page 104: ...104 Fig 44 Field Control and Power Wiring cont...