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LEGEND
1 — 30RA010
2 — 30RA015
3 — 30RA018
Fig. 15A — Heat Exchanger Pressure Drop —
30RA010-030 (English)
30
20
10
5
2
1
2
1
Flow Rate (L/S)
LEGEND
1 — 30RA010
2 — 30RA015
3 — 30RA018
Fig. 15B — Heat Exchanger Pressure Drop —
30RA010-030 (SI)
Minimum Loop Volume — The preferred minimum loop
volume is equal to twice the water flow rate per ton. (For
example, the preferred water volume for 2.4 GPM/ton would
be 2 x 2.4 = 4.8 gallons in the loop per ton of cooling.) In order
to obtain leaving water temperature stability for comfort cool-
ing applications, a minimum of 3 gallons per ton is required on
all other unit sizes. For process cooling applications, where
high stability is critical, the loop volume should be increased to
6 to 10 gallons per ton of cooling.
In order to achieve this volume, it may be necessary to add a
water storage tank to the water loop. (The compression/
expansion tank on the 30RA hydronic package is NOT a
storage tank. If a storage tank is added to the system, it should
be properly vented so that the tank can be completely filled and
all air eliminated. Failure to do so could cause lack of pump
stability and poor system operation.)
NOTE: On systems with a high volume, check the section on
maximum loop volume. A different expansion tank may be
required on systems with very high loop volumes.
Any storage tank that is placed in the water loop should
have internal baffles to allow thorough mixing of the fluid. See
Fig 17.
4 — 30RA022
5 — 30RA025
6 — 30RA030
1
2
3
4
5
6
3
4
5
6
4 — 30RA022
5 — 30RA025
6 — 30RA030
7 — 30RA032, 30RA035
8 — 30RA040
9 — 30RA042, 30RA045
Fig. 16A — Heat Exchanger Pressure Drop —
30RA032-055 (English)
25
20
10
5
5
6
7 — 30RA032, 30RA035
8 — 30RA040
9 — 30RA042, 30RA045
Fig. 16B — Heat Exchanger Pressure Drop —
30RA032-055 (SI)
A properly baffled storage tank is available from the factory
as an accessory. These tanks are designed to physically fit
beneath the corresponding 30RA unit, taking up the same
footprint.
Available volumes are as follows:
•
30RA010-018
•
30RA022-030
•
30RA032-055
Maximum Loop Volume — Since the minimum size of the
expansion tank is dependent upon loop volume, units with the
integrated hydronic kit must not exceed the maximum loop
volume limits below (see Table 6). The limits are dependent on
the maximum and minimum temperatures of the water, the
maximum and minimum pressures seen by the expansion tank,
and the heat transfer fluid. Expansion tank and maximum loop
volume data is as follows.
Volume gal
Acceptance Volume gal
16
LEGEND
10 — 30RA050
11 — 30RA055
9
7
8
Flow Rate (L/S)
LEGEND
10 — 30RA050
11 — 30RA055
110 gallons
152 gallons
305 gallons
30RA010-030
30RA032-055
4.4
10.3
3.2
10.3
7
8
9
10
11
10
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