Operation; Cooling Mode; Heating Mode - Carrier Aquazone 50PEC09-18 Installation, Start-Up And Service Instructions Manual

Table 6 — Water Side Pressure Drop
50PEC UNIT
GPM
SIZE
1.3
1.5
09 2.0
2.5
3.0
1.5
2.0
12 2.5
3.0
4.0
2.5
3.0
15
3.5
4.0
5.0
2.5
3.0
18 4.0
5.0
6.0
Table 7 — Approximate Fluid Volume (gal.)
per 100 ft of Pipe
PIPE DIAMETER (in.)
Copper
1
1.25
1.5
Rubber Hose
1
Polyethylene / IPS SDR11
3
4
1 IPS SDR11
1 1 /
4
1 / IPS SDR11
2
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 8 — Antifreeze Percentages by Volume
ANTIFREEZE
Methanol (%)
100% USP Food Grade
Propylene Glycol (%)
PRESSURE PRESSURE
DROP DROP
(PSIG) (ft wg)
0.98 2.25
1.26 2.91
2.11 4.87
3.16 7.29
4.39 10.13
1.26 2.91
2.11 4.87
3.16 7.29
4.39 10.10
7.36 17.00
1.08 2.50
1.50 3.47
1.98 4.58
2.52 5.82
3.77 8.70
1.08 2.50
1.50 3.47
2.52 5.82
3.77 8.70
5.24 12.10
VOLUME (gal.)
4.1
6.4
9.2
3.9
2.8
4.5
IPS SDR11 8.0
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
NOTE: See Fig. 6 for sequence of operations.

Cooling Mode

Energizing the "O" terminal energizes the unit reversing valve in
the cooling mode. The fan motor starts when the "G" terminal is
energized.
NOTE: The fan motor will take 30 seconds to ramp up to operat-
ing speed and will run at fan only rated air flow as long as there is
no call for compressor or heater operation.
When the thermostat calls for cooling (Y+O) the loop pump or so-
lenoid valve if present is energized and the capacity starts. The fan
ramps up to cooling air flow.
Once the thermostat is satisfied, the compressor shuts down ac-
cordingly and the fan ramps down to either fan only mode or off
over a span of 30 seconds.
NOTE: A fault condition initiating a lockout will de-energize the
compressor irrespective of which stage is engaged.

Heating Mode

The heating (Y) operates in the same manner as cooling, but with
the reversing valve de-energized. Once the thermostat is satisfied,
the compressor shuts down and the fan ramps down either fan
only mode or off.
25
10
15
15

OPERATION