Start-Up; Operating Limits; Unit Start-Up; Scroll Compressor Rotation - Carrier Aquazone 50PSW025 Installation, Start-Up And Service Instructions Manual

START-UP

Use the procedure outlined below to initiate proper unit
start-up.
NOTE: This equipment is designed for indoor installation
only.
Operating Limits (See Table 7)
ENVIRONMENT — This equipment is designed for indoor
installation ONLY. Extreme variations in temperature, humidi-
ty and corrosive water or air will adversely affect the unit per-
formance, reliability and service life.
POWER SUPPLY — A voltage variation of ± 10% of name-
plate utilization voltage is acceptable.
NOTE: These operating conditions are not normal or continu-
ous operating conditions. It is assumed that start-up is for the
purpose of bringing the building space up to occupancy
temperature.
WARNING
When the disconnect switch is closed, high voltage is pres-
ent in some areas of the electrical panel. Exercise caution
when working with the energized equipment.
Table 7 — 50PSW Unit Operating Limits
WATER LIMITS
SOURCE COIL
Min Entering Water
Normal Entering Water
Max Entering Water
LOAD COIL
Min Entering Water
Normal Entering Water
Max Entering Water

Unit Start-Up

1. Set the primary controller to the highest setting.
2. Set the primary controller system switch to "COOL." The
reversing valve solenoid should energize. The compres-
sor should not run.
3. Reduce the primary controller setting approximately 5
degrees below return fluid temperature.
4. Verify the heat pump is operating in the cooling mode.
5. Check the cooling refrigerant pressures against the values
listed in Table 5.
6. Turn the primary controller system switch to the "OFF"
position. The unit should stop running and the reversing
valve should de-energize.
7. Leave the unit off for approximately (5) minutes to allow
for system equalization.
8. Turn the primary controller to the lowest setting.
9. Set the primary controller switch to "HEAT."
10. Increase the primary controller setting approximately 5
degrees above the return fluid temperature.
11. Verify the heat pump is operating in the heating mode.
12. Check the heating refrigerant pressures against the values
listed in Table 6.
13. Set the primary controller to maintain the desired return
fluid temperature.
14. Check for vibrations, leaks, etc.
15. Instruct the owner on the unit and control operation.
COOLING HEATING
(F) (F)
50 20
85 60
110 70
50 60
60 100
90 120
Scroll Compressor Rotation —
certain compressor is rotating in the proper direction. To
determine whether or not compressor is rotating in the proper
direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge
pressure does not rise to normal levels:
1. Turn off power to the unit. Install disconnect tag.
2. Reverse any two of the unit power leads.
3. Reapply power to the unit and verify pressures are cor-
rect. The suction and discharge pressure levels should
now move to their normal start-up levels.
When the compressor is rotating in the wrong direction, the
unit makes an elevated level of noise and does not provide
cooling. Damage to compressor will occur if allowed to
operate in this manner.
After a few minutes of reverse operation, the scroll com-
pressor internal overload protection will open, thus activating
the unit lockout. This requires a manual reset. To reset, turn the
thermostat on and then off.
NOTE: There is a 5-minute time delay before the compressor
will start.
Cleaning and Flushing —
the piping system is the single most important step to ensure
proper start-up and continued efficient operation of the system.
To avoid possible injury or death due to electrical shock,
open the power supply disconnect switch and secure it in
an open position before flushing system. Install lockout
tag.
Follow the instructions below to properly clean and flush
the system:
1. Verify electrical power to the unit is disconnected and
lockout tag installed.
2. Install the system with the supply hose connected directly
to the return riser valve. Use a single length of flexible
hose.
3. Open all air vents. Fill the system with the water. DO
NOT allow system to overflow. Bleed all air from the
system. Pressurize and check the system for leaks and re-
pair appropriately.
4. Verify all strainers are in place. Start the pumps, and sys-
tematically check each vent to ensure all air is bled from
the system.
5. Verify make-up water is available. Adjust make-up water
appropriately to replace the air which was bled from the
system. Check and adjust the water/air level in the expan-
sion tank.
6. Raise the loop temperature to approximately 85F. Open
the drain at the lowest point in the system. Adjust the
make-up water replacement rate to equal the rate of bleed.
7. Refill the system and add trisodium phosphate in a pro-
portion of approximately one pound per 150 gal. of water
(or other equivalent approved cleaning agent).
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It is important to be
CAUTION
Cleaning and flushing of
WARNING