HWM-H-IOM (10/14)
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Figure 12 shows minimum antifreeze solution flow rates for various mixtures of propylene glycol
and water
.
Compressor Unit
Size/Capacity
(BTUH)
HWM
Model
Minimum Propylene Glycol/Water Solution Flow
Rates, GPM
20% PG
30% PG
40% PG
50% PG
-018 (18,000)
-1836
3.1
3.2
3.3
3.5
-024 (24,000)
-1836
4.1
4.3
4.4
4.6
-030 (30,000)
-1836
5.2
5.4
5.6
5.8
-036 (36,000)
-1836
6.2
6.4
6.7
7.0
-042 (42,000)
-4248
7.2
7.5
7.8
8.1
-048 (48,000)
-4248
8.2
8.6
8.9
9.3
-054 (54,000)
-5472
9.3
9.7
10.0
10.5
-060 (60,000)
-5472
10.3
10.7
11.1
11.6
-072 (72,000)
-5472
12.4
12.8
13.3
13.9
Figure 12. Minimum Heat Exchanger Propylene Glycol/Water Solution Flow Rates
To test the solution flow through the hydronic water module, average three solution flow rate
readings when the HWM is in continuous operation as shown in Figure 4.
Check the flow rate against the appropriate rates in Figures 11 or 12.
If flow rate is less than the appropriate minimum shown in Figures 11 or 12,
and the strainer
mesh is clean
, the heat exchanger is to be cleaned by setting the system up as noted in
Figure 13.
IMPORTANT!
Be sure the isolation valves are tightly shut before cleaning the heat
exchanger.
