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Operating Limits
Table 6: Air Limits - °F (English units)
Cooling
Min. Ambient Air
Normal Ambient Air
Max Ambient Air
100°F
Min. Entering Air
1,2
Normal Entering Air db/wb
80/67°F
Max Entering Air db/wb
100/83°F
1,2
Table 7: Air Limits - °C (SI units)
Cooling
Min. Ambient Air
Normal Ambient Air
Max Ambient Air
Min. Entering Air
1,2
Normal Entering Air db/wb
27/19°C
Max Entering Air db/wb
38/28°C
1,2
Table 8: Water - °F (English units)
Standard Range
Cooling
Min. Entering Water
1,2
Normal Entering Water
110°F
Max Entering Water
Table 9: Water - °C (SI units)
Standard Range
Cooling
Min. Entering Water
13°C
1,2
Normal Entering Water
29°C
Max Entering Water
43°C
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.
IM 1083
Standard Range
Geothermal Range
Units
Units
Heating
Cooling
50°F
50°F
40°F
80°F
70°F
80°F
85°F
100°F
50°F
50°F
50°F
70°F
80/67°F
80°F
100/83°F
Standard Range
Geothermal Range
Units
Units
Heating
Cooling
10°C
10°C
5°C
27°C
21°C
27°C
38°C
29°C
38°C
10°C
10°C
10°C
21°C
27/19°C
27°C
38/28°C
Geothermal Range
Units
Units
Heating
Cooling
Heating
55°F
55°F
30°F
85°F
70°F
77°F
90°F
110°F
Geothermal Range
Units
Units
Heating
Cooling
Heating
13°C
-1°C
21°C
25°C
32°C
43°C
Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ
Additional Information For Initial
Start-up
Standard Range units
Units are designed to start-up in an ambient of 50°F (10°C), with
Heating
entering air at 50°F (10°C), with entering water at 70°F (21°C), with
40°F
both air and water flow rates used in the ISO 13256-1 rating test, for
70°F
initial start-up in winter.
85°F
40°F
Note: This is not a normal or continuous operating
70°F
80°F
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
Heating
Geothermal heat pump unit ventilators are designed to start-up in an
5°C
21°C
ambient of 40°F (5°C), with entering air at 40°F (5°C), with entering
29°C
water at 25°F (-4°C), with both air and water at flow rates used in the
5°C
ISO 13256-1 rating test, for initial start-up in winter.
21°C
27°C
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.
20°F
40°F
90°F
-6°C
4°C
32°C
Page 19 of 42
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