M20-000009 - mechanical - Laserfiche WebLink

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Specification for WSHP SmartSource ALL J. Geothermal (extended range) Operation — Manufacturer shall guarantee "extended range" heat pump units to start and operate continuously in an ambient of 40° F, with entering air and water at 40° F, with both air and water at the flow rates used in the ARI/ISO rating test. A geothermal extended range option shall be made up of a TXV metering device and wrapped condenser coil. Closed cell insulation shall be added to the internal water lines and on suction side refrigerant tubing including refrigerant to water heat exchanger. K. Air Section - The air section of the unit shall be isolated from the compressor and control section with an insulated divider panel to minimize the transmission of compressor noise and to permit operational service testing with the compressor compartment cover removed. L. Filter and Filter Racks — All units shall be provided with a 2" thick, disposable type fiberglass filter installed in a factory mounted four-sided 2" filter frame arranged for side removal. M. Supply and return, condenser water connections — shall be FPT fittings, brazed copper water tubes and securely flush mounted to the cabinet corner post allowing for connection to a flexible hose without the use of a back-up wrench. Condensate drain connection shall not be less than %" FPT fitting securely flush mounted to the corner post. Supply, return, and condensate drain shall be connected to loop and drain piping as detail on mechanical drawings. Piping connections at the unit which require brazing or soldering by the installer (which may damage the unit) shall not be allowed. N. Stainless Steel Drain Pan — Unit shall utilize corrosion resistant closed -cell insulated stainless steel drain pans. A stub out connection shall be provided. The drain pan shall be designed to ensure no pooling of condensate water per ASHRAE 62.2. The unit will be supplied with solid-state electronic condensate overflow protection as standard. Mechanical float switches will not be accepted. 0. Sound Package — Available as a factory installed option, units shall utilize sound attenuating compressor blankets with high technology sound attenuating material that is strategically applied within the air handling compartment casings to further reduce sound transmitted by the unit while in operation. P. Coaxial Coil Supply Liquid Auto Flow Regulator - This factory -installed option includes the addition of an automatic flow control valve to set and limit the GPM through the unit. The valve shall have a "replaceable cartridge" capability. The valve shall be rated for 600 psig. (Note: This option will not be available with Internal Water Pump option.). Q. Control System (Microtech III Unit Controller) - 1. The unit control board shall be the main component of the system and shall contain the required inputs/outputs to operate a water source heat pump with a single speed fan. 2. Unit controller inputs/outputs: The Microtech III controller will be microprocessor -based and have capabilities, performance, and memory sufficient to execute the various functions detailed in this specification. This document will not specify a type, a manufacturer, or a family of microcontrollers to be considered for use. However, at a minimum, the following features are deemed essential: a. Analog Inputs: (Condensate Overflow, Brownout Detection, Suction -Line Temp Sensor, Timed Override Switch, Set point Adjust, Fan Mode — (Heat/Cool/Auto) b. Condensate Overflow. The presence of excessive condensate in the condensate drain pan is detected by a condensate sensor, which consists of a metal terminal ring mounted just below the top of the condensate pan. The analog input dedicated to condensate sensing must be capable of detecting the conductivity of water between the ring terminal and chassis ground. The conductivity trip point is 2.5 micro-ohms. c. Brownout Detection. This analog input will measure the 24VAC input voltage applied to the controller as a means of indirectly monitoring line voltage applied to the unit. The 24VAC input, once rectified, filtered, and fed to an appropriate voltage divider, will be applied to the analog input as a DC voltage level proportional to the input voltage. At a minimum, the measurable range will be between 70 and 120% of the corresponding unit nameplate voltage. Due to the tolerances involved with the various components associated with this approach, calibration will occur during factory test when exactly 100% nameplate voltage is applied to the unit while in cooling mode. The digitized value of the resultant DC voltage applied to the analog input during the calibration period will be saved within the controller (in non-volatile memory) and used as a reference Job Number: LL2OFE Page Prepared Date: 10/8/2020 Job Name: Brackets Point House 31 of 35 www.DaikinApplied.com