Armstrong World Industries 182, 243, 302, 242, 122, 123, 203, 183 manual 5 Gas Supply Piping

SRM-HW/HWC 8/99

Service Reference Manual INSTALLATION

6-11

A manual shutoff valve must be located outside the unit. The use of a union located upstream of the controls is recommended, between the controls and the manual shutoff valve. This will facilitate removal of controls and manifold. See Figure 6-5 for recommended placement of the union.

Provide a drip leg in the supply piping located exterior to the unit. Piping must be tight and non-hardening. Pipe compound resistant to propane must be used.

Manual Shutoff Valve w/ 1/8" NPT plugged tapping, accessible for

test gauge connection (field-supplied)

Ground Joint Union (field-supplied)

Drip Leg (field-supplied)

Access Panels to

Controls and Burners

Access Panel To Filter

FIGURE 6-5 Gas Supply Piping

Electrical Connections

All wiring must be done in accordance with the National Electrical Code, ANSI/NFPA No. 70 (latest edition); Canadian Electrical Code Part 1, CSA C22.1 (latest edition); or local codes, where they prevail. Any alteration of internal wiring will void certification and warranty.

The rating plate indicates the operating voltage, phase, ampacity, maxi- mum fuse size and minimum voltage. Units must never be installed where voltage exceeds 10% over the voltage indicated on the rating plate.

Units are factory wired for a 230 volt power supply. If power supply is 208 volts, it will be necessary to change a wire connec- tion on unit transformer from 240 volt terminal to 208 volt termi- nal as shown on the wiring diagram.

Failure of the compressor as a result of operation on improper voltage voids the compressor replacement warranty.

A separate electric line with wire having a temperature rating of 60°C should be run directly from the main supply panel to the leads in the unit. Refer to the rating plate located on the unit for proper fuse or breaker size. Make sure the unit is electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/ NFPA No. 70 (latest edition) for installations in the U.S. or the Canadian Electrical Code Part 1, CSA C22.1 (latest edition) for installations in Canada.