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4 for access hole location by number. †Fittings are listed in order from header or tee stub connection out to access hole in corner support post. 16 Table 3 — Fitting Requirements (cont) UNIT ACCESS HOLE NO.* CONNECTION TYPE CIRCUIT FITTINGS REQUIRED† (in.) 40RMS 028, 034 5 Supply Lower 21.8 Long Radius Elbow 21.8 Nipple, 31.2 L 21.8 Long Radius Elbow 6 Return Lower 21.8 Long Radius Elbow 21.8 Nipple, 3 L 21.8 Long Radius Elbow 7 Return Upper 21.8 Long Radius Elbow 21.8 Nipple, 67.8 L 21.8 Long Radius Elbow 8 Supply Upper 21.8 Long Radius Elbow 21.8 Nipple, 117.8 L 21.8 Long Radius Elbow 40RM 034 1 Suction Lower 13.8 Street Elbow 13.8 Nipple, 3 L 13.8 Long Radius Elbow 2 Liquid Lower 5.8 Street Elbow 5.8 Nipple, 73.4 L 5.8 Long Radius Elbow 3 Liquid Upper 5.8 Street Elbow 5.8 Nipple, 181.2 L 5.8 Long Radius Elbow 4 Suction Upper 13.8 Nipple, 43.16 L 13.8 Long Radius Elbow 13.8 Nipple, 191.4 L 13.8 Long Radius Elbow *See Fig. 4 for access hole location by number. †Fittings are listed in order from header or tee stub connection out to access hole in corner support post. Chilled Water Piping — See Tables 1C and 1F for To size, design, and install chilled water piping, consult chilled water connection sizes. For ease in brazing, it is rec- the Carrier System Design manual. See Fig. 9 for an exommended that all internal solder joints be made before unit ample of a typical installation. Recommended fittings are listed is placed in final position. in Table 3. To access 40RMS coil vents and drains, remove the unit and 40RMQ refrigerant piping; additional field-fabricated ac- Knockouts are provided in the unit corner posts for 40RM side panel over the coil header. Vent and drain plugs are on cess holes are required for 40RMS chilled water piping. See the top and bottom of header, respectively. See the Service Fig. 4, which lists recommended knockouts and access holes section for information on preventing coil freeze-up during to use for each 40RMS unit size. winter. Fig.9—Typical 40RMS Chilled Water Piping 17 Condensate Drain — Install a trapped condensate drain line to unit connection as shown in Fig. 10. The unit drain connection is a PVC stub. See Fig. 11. Some areas may require an adapter to connect to either galvanized steel or copper pipe. For these applications, install a field-supplied threaded PVC adapter. NOTE: A trap must be installed in the condensate drain line to ensure that the static pressure of fans is balanced with the water column in the drain line and that condensate can drain completely from pan. Without a trap, air can be drawn up drain line until water level in condensate pan becomes equal to static pressure created by fans, preventing complete drainage. Conditions will worsen as filters become dirty. Install clean-out plugs in trap. Pitch drain line downward to an open floor drain or sump. Provide service clearance around drain line to permit removal of unit panels. Observe all local sanitary codes. As shipped, the unit’s condensate drain pan is NOT sloped towards the drain connection. The pan slope must be changed to pitch towards the side of the unit with the drain connection. See Fig. 11. Loosen the 2 screws next to the drain NOTE:Dimensionsin[]areinmillimeters. Fig.10—CondensateDrains outlet at both ends of the unit, push drain pan down in the slots near the drain connection, and up in the slots on the opposite end. Retighten screws. The pan should have a pitch of at least 1.4-in. over its length toward the drain connection. Fan Motors and Drives — Motor and drive packages are factory installed in all units. The standard motor and drive packages consist of the following items: 1 — fan motor 1 — adjustable motor pulley 1 — fan pulley 1 —fan belt (40RM007-016, 40RMQ008-016, 40RMS 008-016 units) 2 —matched fan belts (40RM024-034, 40RMS024-034 units) For instructions on changing fan rotation, changing drive speeds and adjusting drives, see Pulley and Drive Adjustment in the Service section. Fig. 11 — Drain Pan Slope Adjustment 18 Power Supply and Wiring — Check the unit data plate to ensure that available power supply matches electrical characteristics of the unit. Provide a disconnect switch of size required to provide adequate fan motor starting current. See Tables 4 - 6 for unit electrical data. Install disconnect switch and power wiring in accordance with all applicable local codes. See Fig. 12-14 and the unit label diagram. For units with motor sizes less than 5 Hp (3.7 kW), connect power wiring to unit with no. 10 ring terminal. For units with motor sizes of 5 Hp (3.7 kW) or more, connect power wiring with 1.4-in. ring terminal. The 40RM, 40RMQ and 40RMS size 007-016 units (except 40RM016 withYC orWDoption) that have motors wired for 460-v, 3-ph, 60 Hz operation can be field-converted to 230-v, 3-ph, 60 Hz operation. Rewire the motor according to the diagram plate on the motor. After reconfiguring the motor, place the sticker specifying 230-v operation (supplied in installation packet) ...
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