MTD 248-604A Manuel d'installation télécharger pdf (Page 19)

IM 1083 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ Page 19 of 42

Operating Limits

 At ISO 13256-1 flow rate.

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.

Standard Range Geothermal Range

Units 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

Standard Range Geothermal Range

Units 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

Standard Range Geothermal Range

Units 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

Standard Range Geothermal Range

Units 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

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 ow 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 ow 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.

Table 6: Air Limits - °F (English units)

Table 8: Water - °F (English units)

Table 7: Air Limits - °C (SI units)

Table 9: Water - °C (SI units)

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 41 42

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MTD 248-604A Manuel d'installation Page 19

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