990-4618A-001 InRow™ Chilled Water Air Conditioners Technical Specifications 59
P. TEMPERATURE AND HUMIDITY SENSORS
1. Internal Sensors
a. Internal Temperature Sensors: Thermister temperature sensors shall be mounted behind the
front and rear doors to provide control inputs based on supply and return air temperature.
Sensor accuracy shall be within +/- 1 degree F accuracy.
b. Internal Humidity Sensors: Humidity sensors shall be mounted behind both the front and rear
doors and shall provide control input based on humidity in supply air. Humidifier sensor shall
be +/- 3% RH accuracy full scale.
2. Remote Temperature Sensors
a. ACRC100 Series
1. One remote temperature sensor shall be shipped with the unit for placement in the
field to provide control input based on rack inlet temperature.
b. ACRC/ACRP500 Series
1. Three remote rack inlet temperature sensors shall be shipped with the unit for
placement in the field to provide control input based on rack inlet temperature.
3. Water Temperature Sensors: Internal supply and return chilled water temperature sensors shall be
installed into sealed wells. Wells are filled with thermal conducting heat transfer grease to provide
accurate temperature sensors.
Q. SELECTABLE TOP OR BOTTOM PIPING
1. Pipe connections for field connection from either the top or bottom of the unit. Unit connections
shall be made internal to the unit.
2. ACRC100 Series Pipe adapter: The unit shall include two pipe adapters that convert a 25.4 mm
(1 in) NPT male to a 25.4 mm (1 in) BSPT female (manufactured in accordance with BS21). Pipe
adapters shall ship loose with the unit for field installation where applicable.
3. ACRC500/ACRP500 Series Pipe adapter: The unit shall include two pipe adapters that convert a
38.1 mm (1 1/2 in) NPT to a 38.1 mm (1 1/2 in) BSPT (manufactured in accordance with BS21).
Pipe adapters shall ship loose with the unit for field installation where applicable.
R. FLOW METER
1. The flow meter shall be factory piped inside the unit and connected to microprocessor controls to
provide water flow rate through the unit. The microprocessor controller shall also use this
information to provide total unit capacity out of the unit while in operation.
2. The flow meter shall be a glass filled nylon construction vortex-sensing meter, compatible with
glycol/water solutions up to 50% with accuracy of 2.5% FS @ 10–200 LPM (2.6–53 GPM).
S. PIPING
1. The unit shall be piped in accordance with the highest commercial quality procedures. All PEX-
AL-PEX pipe forming for ACRC100 series units shall be tool bent with the proper bend radii to
prevent flattening in the curve. The chilled water piping shall be insulated with closed cell
elastomer insulation. All piping connections should be made at the rear of the unit for top or
bottom accessibility. ACRC/ACRP500 series units are hard-piped directly into a chiller without a
centralized distribution unit and interconnecting piping.
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