Carrier AQUAZONE 50PSH, Installation, Start-Up And Service Instructions Manual

Page: 46 / 64

46
Calculate the total volume of fluid in the piping system.
See Table 14. Use the percentage by volume in Table 15 to deter -
mine the amount of antifreeze to use. Antifreeze concentration
should be checked from a well-mixed sample using a hydrome -
ter to measure specific gravity.
LEGEND
Table 15 — Antifreeze Percentages by Volume
FREEZE PROTECTION SELECTION
The 26°F FP1 factory setting (water) should be used to avoid
freeze damage to the unit.
Once antifreeze is selected, the JW3 jumper (FP1) should be
clipped on the control to select the low temperature (antifreeze
15°F) set point to avoid nuisance faults.
START-UP
Use the procedure outlined below to initiate proper unit start-up.
Operating Limits
ENVIRONMENT
This equipment is designed for indoor installation only. Extreme
variations in temperature, humidity and corrosive water or air will
adversely affect the unit performance, reliability and service life.
NOTE: Two factors determine the operating limits of a unit: enter -
ing-air temperature and water temperature. Whenever any of these
factors are at a minimum or maximum level, the other two factors
must be at a normal level to ensure proper unit operation.
POWER SUPPLY
A voltage variation of ± 10% of nameplate utilization voltage is
acceptable.
UNIT STARTING CONDITIONS
Depending on the model, units should start and operate with enter
-
ing water temperature temperatures between 20°F and 110°F and
entering air temperatures between 45°F and 95°F. Water flow rates
should be between 1.5 and 3.0 GPM/nominal cooling ton.
NOTE: These operating limits are not normal or continuous oper -
ating conditions. Assume that such a start-up is for the purpose of
bringing the building space up to occupancy temperature. See
Table 16 for operating limits.
LEGEND
Start-Up Procedure
1. Restore power to system.
2. Turn thermostat blower position to ON or use the DDC inter -
face to enable the unit blower. The blower should start.
3. Balance airflow at diffusers/dampers.
4. Adjust all water valves to the full open position.
5. Use the thermostat or DDC control to enable the compressor
by placing the unit in cooling mode.
6. Verify compressor operation. If scroll compressor, verify
compressor rotation direction.
SCROLL COMPRESSOR ROTATION
It is important to be certain compressor is rotating in the proper di
-
rection. 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 by using the thermostat or DDC
control to put the unit in cooling mode.
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 correct.
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 more noise and does not provide cooling.
Table 14 — Approximate Fluid Volume (gal.) per
100 Ft of Pipe a
NOTE(S):
a.
Volume of heat exchanger is approximately 1.0 gallon.
PIPE DIAMETER (in.) VOLUME (gal.)
Copper
1 4.1
1.25 6.4
1.5 9.2
Rubber Hose 1 3.9
Polyethylene
3/4 IPS SDR11 2.8
1 IPS SDR11 4.5
1-1/4 IPS SDR11 8.0
1/2 IPS SDR11 10.9
2 IPS SDR11 18.0
1-1/4 IPS SCH40 8.3
1-1/2 IPS SCH40 10.9
2 IPS SCH40 17.0
IPS — Internal Pipe Size
SCH — Schedule
SDR — Standard Dimensional Ratio
ANTIFREEZE
MINIMUM TEMPERATURE FOR
FREEZE PROTECTION (°F)
10 15 20 25
Methanol (%) 25 21 16 10
100% USP Food Grade
Propylene Glycol (%)
38 30 22 15
Ethanol (%) 29 25 20 14
Table 16 — Operating Limits
AIR LIMITS
STANDARD
UNIT
EXTENDED
RANGE
OPTION
COOLING
Minimum cooling entering air db/wb F 68/57 68/57
Maximum cooling entering air db/wb F 95/85 95/85
Minimum cooling entering fluid temp. F 70 50
Water loop typical coil entering fluid
range temperature F
70/90 70/90
Maximum cooling entering fluid
temperature F
110 110
HEATING
Minimum heating entering air db F 50 50
Maximum heating entering air db F 80 80
Normal water coil entering fluid range F 50-80 25-80
a
NOTE(S):
a.
Antifreeze solution is required at these fluid temperatures.
Minimum water coil entering Fluid F 50 25
a
DB — Dry Bulb
WB — Wet Bulb
WARNING
When the disconnect switch is closed, high voltage is present
in some areas of the electrical panel. Exercise caution when
working with the energized equipment. Failure to heed this
warning could lead to personal injury.