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What are the operational conditions for an InRoom (Stulz) Unit

Published date: 18 July 2020


This document will describe what are the operational conditions for an InRoom (Stulz) Unit

Product line:
ACPDX21-86, ACPCW40-150

Environment :
All Serial Numbers 



The InRoom precision air conditioning units operate within the following ranges:


Room Conditions:

Between 18°C (64°F), 40% Relative Humidity (R.H.), and 27°C (81°F), 55% R.H.

Outdoor ambient conditions: Lower limit: -10°C (14°F) Upper limit: Depending on selected condenser


460V / 3ph / 60 Hz

208-230V / 3ph / 60 Hz

Voltage tolerance: +/- 10%

Voltage imbalance: <3%

Frequency:60 Hz +/- 1%

Chilled water-/cooling water pipes:

Maximum water head pressure: 10 bar (145 psi)

Maximum equivalent length of piping between the cooling unit and the air cooled condenser: 60 m (200 ft)

Maximum level difference between the condenser and the cooling unit: 5 m (16 ft) when the condenser is below the cooling unit


Storage conditions:

Temperature: -20 - +42°C (-4 - +107.6°F)

Humidity: (% R. H.): 5 - 95

Atmospheric pressure: 70 - 110 kPa (10 - 16 psi)


Design Conditions

Return air conditions for evaporator capacity (DX): 24°C (75°F) 50% R. H.

Return air conditions for cooling capacity (CW): 24°C (75°F) 50% R.H.

Entering water temperature (EWT) for CW coil: 7°C (44.6°F)

Leaving water temperature (LWT) for CW coil: 12°C (53.6°F)

Condensing temperature: 45°C (113°F)

Maximum condensing temperature: 60°C (140°F)

Cooling fluid (DX): 30% Glycol

Fluid inlet temperature (G): 30°C (86°F)

Fluid outlet temperature (G): 40°C (104°F)

Chilled water medium (CW): 0% Glycol

Data is valid for: 460V / 3ph /60 Hz

Downflow units with an external static pressure: 20 Pa (0.08 in w g)

Upflow units with an external static pressure: 50 Pa (0.20 in w g)



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