WSHP-PRC001-EN
41
Selection
Procedure
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
.
Differences in test conditions for ARI-ISO versus ARI 320/330 are listed below.
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
Convert
GPM to liters per second.
PressDrop = FtHd x 2990
Convert
feet of water to pascals
Pump Penalty = Flow x PressDrop / 300
Note:
300 is a constant
SP-2: ISO fan wattage adjustment calculation
ISO Fan Wattage Adjustment (CFM, SP)
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
Convert
CFM to liters per second.
ESP = SP x 249
Convert
inches of water to pascals
Fan Watt Adjustment = Flow x ESP / 300
Note:
300 is a constant
Test Conditions
ARI 320
ISO WLHP
(water loop heat pump)
ARI 330
ISO GLHP
(ground loop heat pump)
Cooling Capacity
F
F
F
F
Entering-Air (Dry Bulb)
80
80.6
80
80.6
Entering-Air (Wet Bulb)
67
66.2
67
66.2
Entering Water
85
86
77
77
Leaving Water
95
Note 2
Note 2
Note 2
Fluid Flow Rate
Note 1
Note 3
Note 3
Note 3
Heating Capacity
Entering-Air (Dry Bulb)
70
68
70
68
Entering Water
70
68
32
32
Fluid Flow Rate
Note 1
Note 3
Note 3
Note 3
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.
Summary of Contents for Axiom GEH006
Page 107: ...WSHP PRC001 EN 107 Control Wiring Basic 24V 1 PH 208V 60HZ 1PH ...
Page 108: ...108 WSHP PRC001 EN Control Wiring Deluxe 24V 3 PH 208V 60HZ 3PH ...
Page 109: ...WSHP PRC001 EN 109 Control Wiring Tracer ZN510 1PH 208V 60HZ 1PH ...
Page 110: ...110 WSHP PRC001 EN Dimensional Data Tracer ZN524 3PH 460V 60HZ 3PH ...
Page 123: ...WSHP PRC001 EN 123 Dimensional Data Front Return Back Supply 12 1 2 15 Ton ...
Page 124: ...124 WSHP PRC001 EN Dimensional Data Back Return Front Supply 12 1 2 15 Ton ...
Page 125: ...WSHP PRC001 EN 125 Dimensional Data Front Return Top Supply 12 1 2 15 Ton ...
Page 126: ...126 WSHP PRC001 EN Dimensional Data Back Return Top Supply 12 1 2 15 Ton ...