Bryant 581B D. Field Duct Connections, Ð Location of Coil Area Not To Be Drilled

Liquid Propane

Units are shipped for use with natural gas, but may be ®eld- converted for use with liquid propane with accessory LP (liq- uid propane) kit.

All LP gas equipment must conform to NFPA safety standards.

LP gas pressure at the unit must not be less than 5 in. wg or greater than 13 in. wg under full load. Maintaining proper gas pressure depends on:

1.Vaporization rate. (Vaporization rate is determined by the temperature of the LP and the level of LP in the tank.)

2.Proper pressure regulation. (Two-stage regulation is more cost effective and efficient.)

3.Pressure drop in lines between regulators and between the second-stage regulator and the appliance. Pipe size is determined by the length of the pipe run and the to- tal load of all appliances.

Contact your LP gas supplier or regulator manufacturer for further details regarding tank sizing, recommended regula- tor settings, and pipe sizing.

Special pipe compound must be used when assembling pip- ing for liquid propane gas as white lead or commercial com- pounds will be easily dissolved. Use a shellac-based compound suitable for use with LP.

D. Field Duct Connections

NOTE: The design and installation of the duct system must be in accordance with the standards of the NFPA for the in- stallation of nonresidence-type air-conditioning and ventilat- ing systems, NFPA No. 90A or residence-type, NFPA No. 90B; and/or local codes and ordinances.

Adhere to the following criteria when selecting, sizing, and installing the duct system:

1.Remove appropriate panels from unit to obtain either a horizontal or vertical application. If units are installed for horizontal applications, remove vertical duct covers, save screws, and install covers on vertical duct openings.

2.Select and size ductwork, supply-air registers, and return- air grilles according to ASHRAE (American Society of Heating, Refrigeration and Air Conditioning Engi- neers) recommendations.

Fig. 12 Ð Location of Coil Area Not To Be Drilled

CAUTION: When the duct system fastening holes are being drilled into the side of the unit for duct ¯anges, be careful not to puncture the coil or coil tubes. See Fig. 12.

3.Use ¯exible transition between rigid ductwork and unit to prevent transmission of vibration. The transition may be screwed or bolted to duct ¯anges. Use suitable gas- kets to ensure weather- and airtight seal.

4.When horizontal return is used, install external, ®eld- supplied air ®lters in return-air ductwork where they are easily accessible for service. Recommended ®lter sizes are shown in Table 1.

5.For horizontal applications, be sure ductwork does not cover nameplate.

6.Size all ductwork for maximum required air¯ow (either heating or cooling) for unit being installed. Avoid abrupt duct size increases or decreases.

7.Adequately insulate and weatherproof all ductwork lo- cated outdoors. Insulate ducts passing through uncon- ditioned space, and use vapor barrier in accordance with latest issue of SMACNA (Sheet Metal and Air Condi- tioning Contractors National Association) and ACCA (Air Conditioning Contractors of America) minimum instal- lation standards for heating and air-conditioning sys- tems. Secure all ducts to building structure.

8.Flash, weatherproof, and vibration isolate all openings in building structure in accordance with local codes and good building practices.

E.Electrical Connections

WARNING: The unit cabinet must have an uninter- rupted, unbroken electrical ground to minimize the pos- sibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire con- nected to the unit ground lug in the control compart- ment or conduit approved for electrical ground when installed in accordance with the NEC (National Elec- trical Code); ANSI/NFPA, latest edition, (in Canada, Canadian Electrical Code CSA [Canadian Standards As- sociation] C22.1); and local electrical codes. Do not use gas piping as an electrical ground. Failure to adhere to this warning could result in personal injury.

CAUTION: Failure to follow these precautions could result in damage to the unit being installed:

Field Power Supply (Fig. 13-15)

1.Make all electrical connections in accordance with NEC ANSI/NFPA, latest edition, and local electrical codes gov- erning such wiring. In Canada, all electrical connec- tions must be in accordance with CSA standard C22.1 Canadian Electrical Code Part 1 and applicable local codes. Refer to unit wiring diagram.

2.Use only copper conductor for connections between ®eld- supplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE. Maximum wire size is no. 2 AWG (American Wire Gage).

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