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36 — Economizer with Return/Exhaust Fan Outdoor-Air Hood Installation (48Z6,Z8075-105 Units) 34 Install Economizer Hoods (48ZT,ZW Units) — The economizer uses a total of 4 outdoor intake hoods, 2 on each side of the unit. See Fig. 37. Two small hoods (one perside) are factory-installed and are pivoted inside the unit chassis for shipment. Two large hoods are shipped in packageslocated inside the unit. The large hoods (1 on each side) requirefield assembly and mounting. INSTALL SMALL HOODS — To install the small economizer hoods, perform the following procedure: 1. Remove the 10 screws holding each of the small economizer hood shipping covers in place. 2. Pivot hoods outward. (There are a total of 2 hoods.) 3. Apply seal strip to vertical flange of hood sides. 4. Install 15 screws (4 each side, 7 across top) around theoutside of each hood. Screws are in the fastener packagetaped to the basepan inside the fan section. 5. Apply a bead of RTV or similar sealant to corner of economizer hood at pivot point to prevent water leaks. (SeeFig. 30.) INSTALL LARGE HOODS — Large hoods are shipped disassembled in the economizer section of the unit behind the large economizer hood shipping cover. See Fig. 38 for assembly details for large economizer hoods. To install the largeeconomizer hoods, perform the following procedure: 1. Remove the 17 screws holding each of the large economizer hood shipping covers in place. 2. Remove the packages containing the disassembled largeeconomizer hoods (total of 2 packages). Each package PE VFD EXHAUST AIR LARGE ECONOMIZER HOOD LOCATION AUXILIARY CONTROL BOX POWER EXHAUST ACCESS DOOR SMALL ECONOMIZER HOOD LOCATION LEGEND PE VFD — Power Exhaust Variable Frequency Drive Fig. 37 — Economizer Hood Location — 48ZT,ZW Units contains the following: left hood side, right hood side, hood top, hood front, top filter flange, side filter flanges(4), bottom support, front support, filters (6), filter clips(9), seal strip, fasteners. 3. Place seal strip on backside of bottom support along entire length of support, covering 6 clearance holes. 4. Attach bottom support piece to unit. Be sure seal strip isbetween bottom support and panel on unit. 5. Place seal strip on 3/4-in. flange on both the left and righthood side. 6. Attach the side filter flanges to the left and right hoodsides, 2 on each hood side. 7. Attach left and right hood sides to unit. Be sure seal stripis between hood side and unit. 8. Place seal strip on 3/4-in. flange on hood top. 9. Attach top filter flange to hood top. 10. Attach top hood to unit and to hood sides. Be sure sealstrip is between hood top and unit. 11. Attach front support between left and right hood sides. 12. Place seal strip on all filter flanges. 13. Attach filter clips to front and bottom supports. 14. Install filters and filter clips. Filters are held in place withfilter clips. 15. Attach hood front to hood top and sides. 16. Apply RTV or similar sealant to 6 places shown inFig. 38. ACCESS DOOR 35 36 Field Wire Routing UNIT SIZES 030-050 — Field wiring can be brought into the unit through the basepan and roof curb or through the corner post in the side of the unit next to the control box. A 31/2-in. NPT coupling for field power and a 3/4-in. NPT coupling for 24 v control wiring are provided in the basepan. There are two 45/8-in. knockouts in the corner post for field power wiring. If field power wiring is brought through the roof curb, route wiring out through one of the 45/8-in. knockouts to the fieldsupplied disconnect and then back into the unit through the other knockout. See Fig. 39 for recommended disconnect location. If power wiring is brought through the side of the unit, route wiring from field-supplied disconnect through top 45/8-in. knockouts into unit. If control wiring is to be brought in through the side of the unit, a 7/8-in. diameter hole must be drilled in the corner post next to the control box. UNIT SIZES 055-105 — Field wiring is brought into the unit through the bottom of the control box. Wiring can be brought through the roof curb through field-supplied watertight connections. See Fig. 40 and 41. A 45/32-in. hole for field power wiring and a 7/8-in. hole for 24 v control wiring are provided in the bottom of the control box. Field-supplied couplings must be used when routing wiring into the control box. See Fig. 40 and 41 for recommended disconnect location. Field Electrical Connections POWER WIRING — Units are factory wired for the voltage shown on the unit nameplate. The main terminal block is suitable for use with aluminum or copper wires. Maximum wire size varies according to disconnect size. Units Without Factory-Installed Disconnect — When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (MOCP [Maximum Overcurrent Protection] of unit is on the informative plate). All field wiring must comply with NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. S...

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