Power Supply; Unit Starting Conditions; Freeze Protection Selection - Carrier Aquazone 50PCH007 Installation, Start-Up And Service Instructions Manual

ANTIFREEZE
In areas where entering loop temperatures drop below 40°F or
where piping will be routed through areas subject to freezing, anti-
freeze is needed.
Alcohols and glycols are commonly used as antifreeze agents.
Freeze protection should be maintained to 15°F below the lowest
expected entering loop temperature. For example, if the lowest ex-
pected entering loop temperature is 30°F, the leaving loop tem-
perature would be 22 to 25°F. Therefore, the freeze protection
should be at 15°F (30°F - 15°F = 15°F).
NOTE: All alcohols should be pre-mixed and pumped from a res-
ervoir outside of the building or introduced under water level to
prevent fuming.
Calculate the total volume of fluid in the piping system.
See Table 13. Use the percentage by volume in Table 14 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.
Table 13 — Approximate Fluid Volume (gal.) per 100
Ft of Pipe
PIPE DIAMETER (in.)
Copper
Rubber Hose
3 /
4
1 IPS SDR11
1 /
1
4
1 /
2
Polyethylene
2 IPS SDR11
1 1 /
4
1 1 /
2
2 IPS SCH40
LEGEND
IPS — Internal Pipe Size
SCH — Schedule
SDR — Standard Dimensional Ratio
NOTE: Volume of heat exchanger is approximately 1.0 gallon.
Table 14 — Antifreeze Percentages by Volume
ANTIFREEZE
Methanol (%)
100% USP Food Grade
Propylene Glycol (%)
Ethanol (%)

FREEZE PROTECTION SELECTION

The 30°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
13°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.
VOLUME (gal.)
1 4.1
1.25 6.4
1.5 9.2
1 3.9
IPS SDR11 2.8
4.5
IPS SDR11 8.0
IPS SDR11 10.9
18.0
IPS SCH40 8.3
IPS SCH40 10.9
17.0
MINIMUM TEMPERATURE FOR
FREEZE PROTECTION (°F)
10 15 20
25 21 16
38 30 22
29 25 20
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. See Ta-
bles 16-28.

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 and 110°F and en-
tering air temperatures between 45 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 Ta-
ble 15 for operating limits.
Table 15 — Operating Limits
AIR LIMITS
COOLING
Minimum cooling entering air db/wb F
Maximum cooling entering air db/wb F
Minimum cooling entering fluid temp. F
Water loop typical coil entering fluid
range temperature F
Maximum cooling entering fluid
temperature F
HEATING
Minimum heating entering air db F
Maximum heating entering air db F
Normal water coil entering fluid range F
Minimum water coil entering Fluid F
LEGEND
DB — Dry Bulb
WB — Wet Bulb
*Antifreeze solution is required at these fluid temperatures.
Start-Up Procedure
25
When the disconnect switch is closed, high voltage is present
10 in some areas of the electrical panel. Exercise caution when
working with the energized equipment. Failure to heed this
15
warning could lead to personal injury.
14
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.
30
EXTENDED
STANDARD
RANGE
UNIT
OPTION
68/57
95/85
70
70/90
110
50
80
50-80
50
WARNING
68/57
95/85
50
70/90
110
50
80
25-80*
25*