Operating Pressures
Water Pressure Drop
Table 7 should be used to define feet of head/pressure drop. Note: To calculate feet of head, when using gauges that read in PSIG, multiply PSI by 2.31.
Table 7: Water pressure drops (WPD) in feet of head
Unit Size |
|
| Cooling |
| Heating | ||
| GPM | EWT |
| Ft. Head | EWT |
| Ft. Head |
|
| F |
| Pressure | F |
| Pressure |
| 1.5 |
|
| 5.1 |
|
| 5.8 |
009 |
| 77 |
|
| 55 |
|
|
2.3 |
| 9.3 |
| 10.6 | |||
| 2.7 |
|
| 12.4 |
|
| 14.0 |
| 2.5 |
|
| 10.2 |
|
| 8.5 |
012 | 3.1 | 77 |
| 14.6 | 55 |
| 16.6 |
| 3.7 |
|
| 19.6 |
|
| 22.0 |
| 2.3 |
|
| 6.2 |
|
| 7.4 |
015 |
| 77 |
|
| 55 |
|
|
3.5 |
| 12.3 |
| 14.1 | |||
| 4.2 |
|
| 16.8 |
|
| 18.8 |
| 2.9 |
|
| 2.4 |
|
| 3.1 |
018 | 4.5 | 77 |
| 4.9 | 55 |
| 5.9 |
| 5.4 |
|
| 6.6 |
|
| 7.7 |
| 3.9 |
|
| 5.0 |
|
| 6.2 |
024 |
| 77 |
|
| 55 |
|
|
6.0 |
| 9.9 |
| 11.8 | |||
| 7.2 |
|
| 13.2 |
|
| 14.5 |
| 5.9 |
|
| 4.9 |
|
| 5.5 |
036 | 9.0 | 77 |
| 9.8 | 55 |
| 11.0 |
| 10.8 |
|
| 13.3 |
|
| 14.7 |
Water Volume
Table 8 is provided for use in calculating glycol requirements for the unit.
Table 8: Water volume
Unit | Water Side | Water Side | Water Side |
Model | Volume | Volume | Volume |
GET | Cubic In. | Cubic Ft. | Gallons |
009 | 17.0 | 0.010 | 0.074 |
|
|
|
|
012 | 17.0 | 0.010 | 0.074 |
015 | 36.0 | 0.021 | 0.156 |
|
|
|
|
018 | 48.0 | 0.028 | 0.208 |
024 | 55.0 | 0.032 | 0.238 |
|
|
|
|
036 | 71.0 | 0.041 | 0.307 |
|
|
|
|
Flow Checks
For the operating temperature drop (heating) and rise (cooling), refer to Table OP1 and OP2 for the proper water tempera- ture change. Depending on the unit size, entering water temperature and water flow rate, the cooling temperature rise is from
Pressure
Using the P/T ports and one
Start-up Checklist and Log
Use the form on page 24 to log system and unit temperatures during
!WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety pre- cautions when exposed to live electrical components could result in death or serious injury.
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