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DocuSign Envelope ID: 9826C043- 4C32- 49CD- A4CC- DC28ABAB7CE7 <br />SECTION 239500 — MULTI - INDOOR VRV SYSTEM <br />5. A dedicated hot gas pipe shall be required to ensure optimum heating operation perfor- <br />mance. <br />a. Two -pipe, heat recovery systems utilizing a lower temperature mixed liquid /gas re- <br />frigerant to perform heat recovery are not acceptable due to reduced heating capa- <br />bilities. <br />6. The Daikin condensing unit shall be interconnected to indoor unit models FXFQ, FXHQ, <br />FXUQ, FXEQ, FXMQ, FXLQ, FXNQ, FXTQ, FXDQ, FXZQ, FXAQ and FXMQ_MF, and <br />shall range in capacity from 7,500 Btu /h to 96,000 Btu /h in accordance with Daikin's en- <br />gineering data book detailing each available indoor unit. <br />a. The indoor units shall be connected to the condensing unit utilizing Daikin's <br />REFNET'' specified piping joints and headers to ensure correct refrigerant flow and <br />balancing. T style joints are not acceptable for a variable refrigerant system. <br />7. Operation of the system shall permit either individual cooling or heating of each indoor <br />unit simultaneously or all of the indoor units associated with each branch of the cool /heat <br />selector box (BSQ_T / BS_Q54T). Each indoor unit or group of indoor units shall be able <br />to provide set temperature independently via a local remote controller, an Intelligent Con- <br />troller, an Intelligent Manager or a BMS interface. <br />8. Branch selector boxes: <br />a. The branch selector boxes shall have the capacity to control up to 290 MBH (cooling) <br />downstream of the branch selector box. <br />b. Each branch of the branch selector box shall consist of three electronic expansion <br />valves, refrigerant control piping and electronics to facilitate communications between <br />the box and main processor and between the box and indoor units. <br />c. The branch selector box shall control the operational mode of the subordinate indoor <br />units. The use of three EEV's ensures continuous heating during defrost (multiple <br />condenser systems), no heating impact during changeover and reduced sound lev- <br />els. <br />d. The use of solenoid valves for changeover and pressure equalization shall not be ac- <br />ceptable due to refrigerant noise. <br />9. The REYQ_TA condensing unit model numbers and the associated number of connecta- <br />ble indoor units per REYQ_TA condensing unit is indicated in the following table. Each <br />indoor unit or group of indoor units shall be independently controlled. <br />MODEL NUMBER <br />NOMINAL CAPACITY (Tons) <br />MAXIMUM NUMBER OF <br />INDOOR UNITS <br />REYQ72TAYD* <br />6 <br />12 <br />REYQ96TAYD* <br />8 <br />16 <br />REYQ120TAYD* <br />10 <br />20 <br />REYQ144TAYD* <br />12 <br />25 <br />REYQ168TAYD* <br />14 <br />29 <br />REYQ192TAYD* <br />16 <br />33 <br />Reece, Noland & McElrath, Inc. 239500-15 Orange County Board of Elections <br />Orange Co., NC 05/04/18 <br />