Unit Starting Conditions; Freeze Protection Selection - Carrier Aquazone 50PCH PCV 007 Installation, Start-Up And Service Instructions Manual

Compact water source heat pumps
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ANTIFREEZE
In areas where leaving water 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
expected entering loop temperature is 30°F, the leaving loop
temperature 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
reservoir outside of the building or introduced under water level to
prevent fuming.
Calculate the total volume of fluid in the piping system.
(See Table 16.) Use the percentage by volume in Table 17 to
determine the amount of antifreeze to use. Antifreeze concentra-
tion should be checked from a well-mixed sample using a
hydrometer to measure specific gravity.
Table 16 — Approximate Fluid Volume (gal.)
per 100 Ft of Pipe
PIPE
DIAMETER (in.)
Copper
Rubber Hose
3/4 IPS SDR11
1 IPS SDR11
1-1/4 IPS SDR11
1/2 IPS SDR11
Polyethylene
2 IPS SDR11
1-1/4 IPS SCH40
1-1/2 IPS SCH40
2 IPS SCH 40
NOTE(S):
a. Volume of heat exchanger is approximately 1.0 gallon.
LEGEND
IPS
— Internal Pipe Size
SCH
— Schedule
SDR
— Standard Dimensional Ratio
Table 17 — Antifreeze Percentages by Volume
ANTIFREEZE
Methanol (%)
100% USP Food Grade
Propylene Glycol (%)
Ethanol (%)

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.
a
VOLUME (gal.)
1
4.1
1.25
6.4
1.5
9.2
1
3.9
2.8
4.5
8.0
10.9
18.0
8.3
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:
entering-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 Tables 19-31.)
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
entering water temperature temperatures between 20 and 110°F
and entering 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
operating conditions. Assume that such a start-up is for the
purpose of bringing the building space up to occupancy
temperature. See Table 18 for operating limits.
Table 18 — 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
NOTE(S):
a. Antifreeze solution is required at these fluid temperatures.
LEGEND
DB
— Dry Bulb
WB
— Wet Bulb
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
15
working with the energized equipment. Failure to heed this
warning could lead to personal injury.
14
1.
Restore power to system.
2.
Turn thermostat blower position to ON or use the DDC
interface 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.
43
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
a
25
a

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