IM 1083-3
18 www.DaikinApplied.com
Additional Information For Initial
Start-up
Standard Range Units
Units are designed to start-up in an ambient of 50°F (10°C),
with entering air at 50°F (10°C), with entering water at 70°F
(21°C), with both air and water flow rates used in the ISO
13256-1 rating test, for initial start-up in winter.
Note: This is not a normal or continuous operating condition.
It is assumed that such a start-up is for the purpose
of bringing the building space temperature up to
occupancy temperature setpoint.
Geothermal Range Units
Geothermal heat pump unit ventilators are designed to start-up
in an ambient of 40°F (5°C), with entering air at 40°F (5°C),
with entering water at 25°F (-4°C), with both air and water at
flow rates used in the ISO 13256-1 rating test, for initial start-up
in winter.
Note: This is not a normal or continuous operating condition.
It is assumed that such a start-up is for the purpose
of bringing the building space temperature up to
occupancy temperature setpoint.
Operating Limits
Table 5: Air limits - °F (English units)
Standard Range
Units
Geothermal Range
Units
Cooling
Heating
Cooling
Heating
Min . Ambient Air
50
°
F
50
°
F
40
°
F
40
°
F
Normal Ambient Air
80
°
F
70
°
F
80
°
F
70
°
F
Max Ambient Air
100
°
F
85
°
F
100
°
F
85
°
F
Min . Entering Air
1, 2
50
°
F
50
°
F
50
°
F
40
°
F
Normal Entering Air db/wb
80/67
°
F
70
°
F
80/67
°
F
70
°
F
Max Entering Air db/wb
1, 2
100/83
°
F
80
°
F
100/83
°
F
80
°
F
Table 6: Air limits - °C (SI units)
Standard Range
Units
Geothermal Range
Units
Cooling
Heating
Cooling
Heating
Min . Ambient Air
10
°
C
10
°
C
5
°
C
5
°
C
Normal Ambient Air
27
°
C
21
°
C
27
°
C
21
°
C
Max Ambient Air
38
°
C
29
°
C
38
°
C
29
°
C
Min . Entering Air
1, 2
10
°
C
10
°
C
10
°
C
5
°
C
Normal Entering Air db/wb
27/19
°
C
21
°
C
27/19
°
C
21
°
C
Max Entering Air db/wb
1, 2
38/28
°
C
27
°
C
38/28
°
C
27
°
C
Table 7: Water - °F (English units)
Standard Range
Units
Geothermal Range
Units
Cooling
Heating
Cooling
Heating
Min . Entering Water
1, 2
55°F
55°F
30°F
20°F
Normal Entering Water
85°F
70°F
77°F
40°F
Max Entering Water
110°F
90°F
110°F
90°F
Table 8: Water - °C (SI units)
Standard Range
Units
Geothermal Range
Units
Cooling
Heating
Cooling
Heating
Min . Entering Water
1, 2
13°C
13°C
-1°C
-6°C
Normal Entering Water
29°C
21°C
25°C
4°C
Max Entering Water
43°C
32°C
43°C
32°C
Notes:
1
At ISO 13256-1 flow rate.
2
Maximum and minimum values may not be combined. If one value
is at maximum or minimum, the other two conditions may not
exceed the normal condition for standard units. Extended range
units may combine any two maximum or minimum conditions, but
not more than two, with all other conditions being normal conditions.
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