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If gas valve is subjected to pressure greater than0.5 psig, it must be replaced. Optional Staged Gas Control — The 48Z030-105 large rooftop units may be ordered with an optional factory- installed staged gas control system that monitors heating operation of the rooftop. The control system is composed of severalcomponents as listed in sections below. Table 17 shows 48ZSeries staged gas implementation. Refer to the Unit Controls and Troubleshooting book for information on configuring staged gas control. Fig. 56 — Front View of CompressorMounting Rail Assembly — Size 105 Units COMPRESSOR MOUNTING FOOT NUT COMPRESSOR MOUNTING RAIL Fig. 57 — Rear View of Compressor Mounting Rail Assembly — Size 105 Units NOTE: All dimensions are in inches (mm). Fig. 55 — Compressor Mounting (Sizes 030-090) 55 *NPT plug is field supplied. NOTE: Follow all local codes. Fig. 58 — Gas Piping Details Installing Flue/Inlet Hoods — The flue and inlet hoods are shipped in a package taped to the basepan in the fansection. The flue (outlet) hoods are pre-assembled. The flue deflector and inlet hoods require assembly. The hoods are located on the heating section access panel asshown in Fig. 59 (sizes 030-050) or Fig. 60 (sizes 055-105). See Table 18 for a list of parts used to assemble each hood andquantities of each hood type used with each unit. 1. Remove shipping block-offs and shipping tape from allopenings in the access panel. 2. Attach flue outlet hoods (see Fig. 61) to access panel using screws provided. Hoods are placed over each combustion outlet. 3. Install flue deflector baffle inside flue deflector hood. See Fig 62 for sizes 030-050 and 075-105 (V-type deflector). See Fig. 63 for sizes 055-105 (curve-type deflector). Install flue deflector hood assembly over each flue outlethood (installed in Step 2). Observe the offset mountinghole locations in the deflector hood flanges when attaching hood to panel (see Fig. 64). Holes in the mountingflange must be at the bottom when attached. 4. Inlet hoods are shipped unassembled and must be assembled on the access panel (see Fig. 65). Flanges of thehood top and sides should be placed on the inside of theaccess panel openings. Install hood top and sides withscrews provided. Attach speed clips to screen and insertscreen into bottom opening of hood. Secure with 3screws. On large inlet hoods, attach viewport cover overopening in hood (see Fig. 66). Secure with two screws. Supply-Air Thermistors (Staged Gas Units Only) — Supply-air thermistors are a field-installed, factory- provided component. Three supply-air thermistors are shippedwith staged gas units inside the heating section. Thermistorwires must be connected to SGC in the heating section. SeeTable 19. The supply-air thermistors should be located in thesupply duct with the following criteria: • downstream of the heat exchanger cells • equally spaced as far as possible from the heat exchanger cells • a duct location where none of the supply air thermistorsare within sight of the heat exchanger cells • a duct location with good mixed supply air portion of theunit. Table 17 — 48Z Series Staged Gas Implementation NO. OF STAGES MODEL NUMBER POSITION POINT HEAT SIZE 3 5 6,7,8 10 HTSTGTYP CAPMXSTG LIMTHIHT LIMTLOHT 2 stages Z H, K, W, Y 030 035 040 050 ALL Default=0 Default=45 Default=170 F Default=160 F Low 5 stages Z J, L, X, Z 030 035 040 050 ALL Default=1 Default=20 Default=170 F Default=160 F High H, K, W, Y 055 060 070 ALL Default=1 Default=20 Default=135 F Default=125 F Low H, K 075 090 105 -,A,B,C,D,E Default=1 Default=20 Default=135 F Default=125 F G,H,J,K,L,M Default=1 Default=20 Default=130 F Default=120 F 9 stages Z J, L, X, Z 055 060 070 ALL Default=3 Default=15 Default=135 F Default=125 F High J, L 075 090 105 -,A,B,C,D,E Default=3 Default=15 Default=135 F Default=125 F G,H,J,K,L,M Default=3 Default=15 Default=130 F Default=120 F LEGEND CAPMXSTG — Maximum Capacity per Changes HTSTGTYP — Heat Stage Type LIMTHIHT — Limit Switch Thermistor High Temperature LIMTLOHT — Limit Switch Thermistor Low Temperature 56 INLET HOOD FLUE HOOD AND FLUE DEFLECTOR HOOD (48 SERIES HIGH-HEAT ONLY) INLET HOOD FLUE HOOD AND DEFLECTOR HOOD INLET HOOD Fig. 59 — Flue/Inlet Hood Locations, 030-060 Units DEFLECTOR FLUE AND LOCATION HIGH-HEAT FLUE HOOD FLUE HOOD AND FLUE DEFLECTOR HOOD LARGE INLET HOOD FLUE AND FLUE SMALL DEFLECTOR INLET HOOD HOOD LOCATION (HIGH-HEAT ONLY) LARGE INLET HOOD ( ONLY) Fig. 60 — Flue/Inlet Hood Locations, 055-105 Units PUSH BAFFLE DOWN SO THESE 2 HOLES ALIGN FLUE DEFLECTOR BAFFLE FLUE DEFLECTOR HOOD TOP (WHEN INSTALLED) Fig. 62 — Flue Deflector Baffle, 030-050 and 075-105 Units (V-Type) FLUE DEFLECTOR HOOD FLUE DEFLECTOR BAFFLE (BOTH HOODS) Fig. 63 — Flue Deflector Baffle, 055-105 Units (Curve-Type) OBSERVE OFFSET MOUNTING HOLE LOCATIONS WHEN INSTALLING FLUE DEFLECTOR HOODS. Fig. 61 — Flue Outlet Hood Fig. 64 — Mounting Deflector Hoods 57 ACCESS PANEL COVER VIEW PORT COVER Fig. 66 — Inlet Hood View Port Cover Installation (055-105...

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