Trane Axiom GET024-036, Installation, Operation And Maintenance Manual, Page: 28 / 40

Operating Pressures
28 WSHP-SVX10H-EN
Water Pressure Drop
The following table 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 18. Water pressure drops (WPD) in feet of head
Unit GPM
Cooling Heating
EWT °F
Ft. Head
Pressure EWT °F
Ft. Head
Pressure
GET*009 1.1 77 1.8 55 2.1
GET*009 2.1 77 5.3 55 6.1
GET*009 2.6 77 7.9 55 9.0
GET*012 1.5 77 3.9 55 5.2
GET*012 2.8 77 11.9 55 15.3
GET*012 3.5 77 17.6 55 22.5
GET*015 1.9 77 3.9 55 4.7
GET*015 3.5 77 11.8 55 13.8
GET*015 4.4 77 17.5 55 20.3
GET*018 2.3 77 3.2 55 3.9
GET*018 4.2 77 9.7 55 11.5
GET*018 5.3 77 14.3 55 17.0
GET*024 3.0 77 2.9 55 3.6
GET*024 5.6 77 8.6 55 10.5
GET*024 7.0 77 12.8 55 15.4
GET*036 4.5 77 4.7 55 5.7
GET*036 8.4 77 14.2 55 16.9
GET*036 10.5 77 21.1 55 24.9
Water Volume
Table 19. Model flow option GPM press drop (feet)
GET*009 Low 1.0 5.5
GET*009 High 1.5 6.6
GET*012 Low 1.5 6.6
GET*012 High 2.0 8.1
GET*015 Low 2.5 10.1
GET*015 High 3.5 15.4
GET*018 Low 3.0 12.6
GET*018 High 4.0 18.7
GET*024 Low 4.0 7.6
GET*024 High 6.0 11.4
GET*036 Low 6.0 11.4
GET*036 High 8.0 16.7
The following table is provided for use in calculating glycol
requirements for the unit.
Table 20. Water volume
Unit
Water Side Volume
Cubic In.
Water Side Volume
Cubic Ft.
Water Side
Volume Gallons
GET*009 18.7 0.011 0.081
GET*012 24.9 0.014 0.108
GET*015 37.2 0.022 0.161
GET*018 40.9 0.024 0.177
GET*024 62.6 0.036 0.271
GET*036 85.0 0.049 0.368
Flow Checks
For the operating temperature drop (heating) and rise
(cooling), refer to
Table 17, p. 26 for the proper water
temperature change. Depending on the unit size, entering
water temperature and water flow rate, the cooling
temperature rise is from 8°F - 16°F. Based on the same criteria
for heating, the temperature drop is from 2°F - 13°F.
Pressure
Using the P/T ports and one 0-60 psi pressure gauge with the
P/T port adapter, measure the pressure difference between
the water-in and water-out connections. Compare the
pressure differential to
Table 18, p. 28 to determine flow.
GET*036 95 7.10 145-167 355-452 11-14 15-19 — — — —
GET*036 95 9.10 145-167 347-441 8-11 15-19 — — — —
Table 17. Operating pressures (continued)
Model
Entering
Water Temp
°F
Water Flow
GPM
Operating Data
Cooling Heating
Suction
Pressure,
PSIG
Discharge
Pressure,
PSIG
Water Temp
Rise °F
Air Temp
Drop °F DB
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Water Temp
Drop °F
Air Temp
Rise °F DB
Table 19. Model flow option GPM press drop (feet)