Manual Selection Procedure - Trane GEH 006 Manual

New Performance Ratings
All performance data in this catalog is rated to the new ARI-ISO 13256-1 standard . The following information should be
used in gaining a clearer understanding of the differences on the new ARI-ISO standard versus the ARI 320/330 standards
of today.
The ARI-ISO 13256-1 standard includes adjustment to include pump wattage and fan wattage. For these new calculations,
review SP-1 for ISO pump penalty adjustment calculation and SP-2 for fan wattage adjustment calculation.
SP-1: ISO pump penalty adjustment calculation
ISO Pump Penalty (GPM, Feet of pressure drop)
1. Calculate the pump penalty for the ISO standard
2. Calculations must be done in SI (International Standard) units
Note: GPM = Gallons per minute, the actual flow of water.
FtHd = The measured water side pressure drop in feet of head
Flow = GPM x 0.0631
PressDrop = FtHd x 2990
Pump Penalty = Flow x PressDrop / 300
SP-2: ISO fan wattage adjustment calculation
1. Calculate the fan watt factor for the ISO standard
2. Subtract watts from total watts
3. Calculations must be done in SI (International Standard) units
Note: CFM = Cubic feet per minute of air-flow
SP = External static pressure in inches of water glass
Flow = CFM x 0.472
ESP = SP x 249
Fan Watt Adjustment = Flow x ESP / 300
Differences in test conditions for ARI-ISO versus ARI 320/330 are listed below.
Test Conditions
Cooling Capacity
Entering-Air (Dry Bulb)
Entering-Air (Wet Bulb)
Entering Water
Leaving Water
Fluid Flow Rate
Heating Capacity
Entering-Air (Dry Bulb)
Entering Water
Fluid Flow Rate
Note 1: Flow rate is set by standard rating, cooling test.
Note 2: As determined by the flow rate to be specified by the manufacturer.
Note 3: Flow rate specified by the manufacturer.
WSHP-PRC001-EN
Selection
Procedure
Convert GPM to liters per second.
Convert feet of water to pascals
Note: 300 is a constant
ISO Fan Wattage Adjustment (CFM, SP)
Convert CFM to liters per second.
Convert inches of water to pascals
Note: 300 is a constant
ARI 320 ISO WLHP
(water loop heat pump)
F
80
67
85
95
Note 1
70
70
Note 1
ARI 330
F F
80.6 80
66.2 67
86 77
Note 2 Note 2
Note 3 Note 3
68 70
68 32
Note 3 Note 3
ISO GLHP
(ground loop heat pump)
F
80.6
66.2
77
Note 2
Note 3
68
32
Note 3
41