To Next PageTo Next Page
Need help?Do you have a question about the Carrier Aquazone 50PTH024 and is the answer not in the manual?
The provided document is an installation, start-up, and service manual for the Aquazone™ 50PTH, PTV 024-070 Two-Stage Water Source Heat Pumps with Puron® Refrigerant (R-410A).
Here's a description of the device based on the manual:
The Aquazone™ 50PTH, PTV 024-070 units are two-stage water source heat pumps designed for indoor installation. They utilize Puron® (R-410A) refrigerant and are equipped with an Electronic Commutated Motor (ECM) for constant airflow. These units are designed to provide both cooling and heating functions, with advanced control features for optimal performance and energy efficiency.
The heat pump operates in two primary modes: cooling and heating. In cooling mode, it uses a two-stage compression system to maintain the desired cooling setpoint. To enhance dehumidification and reduce noise, the fan operates at the lowest possible speed, increasing as needed to meet load conditions or if the supply air temperature (SAT) approaches the minimum SAT limit (50°F default). If the SAT continues to fall 5 degrees below the minimum limit, all cooling stages are disabled. The reversing valve remains in the cooling position until the opposite mode is required.
In heating mode, the unit also uses two-stage compression to maintain the desired heating setpoint. Similar to cooling, the fan operates at the lowest speed, increasing if the SAT approaches the maximum SAT limit (110°F default). If the SAT continues to rise 5°F above the maximum limit, all heating stages are disabled. The reversing valve remains in the heating position until the opposite mode is required.
Optional features include hot gas reheat for dehumidification, a two-way water flow control valve, and boilerless heat functionality. The hot gas reheat activates cooling and the hot gas reheat outputs when space humidity exceeds the setpoint and the unit is not actively heating or cooling, operating the fan at medium speed. The two-way water flow control valve regulates water flow through the unit during cooling, heating, or dehumidification calls and is disabled otherwise. Boilerless heat, available with Deluxe D controls, disables the compressor and enables auxiliary heat when the entering water temperature falls below a setpoint, and vice-versa. A pump/valve relay is also available to enable/disable field-installed flow control valves or circulator pumps during cooling, heating, or dehumidification.
The units are available in various sizes (024-070) with different physical dimensions, electrical characteristics, and performance data. For instance, a 50PTH 024 unit has a width of 25.1 inches, depth of 64.1 inches, and height of 19.7 inches. Electrical specifications vary by model and phase (single or three-phase), with supply voltages typically 208/230V or 460V. Control voltage is 24 VAC. Water flow rates are between 1.5 and 3.0 GPM per nominal cooling ton. The refrigerant used is Puron® (R-410A).
The Unit Protection Module (UPM) monitors safeties such as high-pressure switch, low-pressure switch, water-side freeze protection sensor (default trip at 26°F, adjustable to 15°F), air coil freeze protection sensor (default trip at 26°F), and condensate overflow protection sensor. The UPM also incorporates anti-short cycle timers (5-minute delay on break), random start delays (270-300 seconds), low-pressure bypass timers (120 seconds), and brownout/surge protection (shuts down if voltage falls below 18 VAC).
General