Step 5 Ð Install Flue Hood Ð Flue hood is shipped screwed to the burner compartment access panel. Remove from shipping location and, using screws provided, install ¯ue hood and screen in location shown in Fig. 8.
Step 6 Ð Install Gas Piping Ð Unit is equipped for use with type of gas shown on nameplate. Refer to local build- ing codes, or in the absence of local codes, to ANSI Z223.1- latest year and addendum
For natural gas applications, gas pressure at unit gas con- nection must not be less than 4.0 in. wg (5.0 in. wg in high heat units) or greater than 13.0 in. wg while unit is operat- ing. For liquid propane applications, the gas pressure must not be less than 5.0 in. wg or greater than 13.0 in. wg at the unit connection.
Size gas supply piping for 0.5 in. wg maximum pres- sure drop. Do not use supply pipe smaller than unit gas connection.
LEGEND
NFGC Ð National Fuel Gas Code *Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
STEEL PIPE | X | |
NOMINAL | ||
DIMENSION | ||
DIAMETER | ||
(feet) | ||
(in.) | ||
| ||
1¤2 | 6 | |
3¤4 or 1 | 8 | |
11¤4 or larger | 10 |
Support gas piping as shown in the table in Fig. 9. For example, a
See Fig. 9 for typical pipe guide and locations of external manual gas shutoff valve.
Step 7 Ð Make Electrical Connections
Unit cabinet must have an uninterrupted, unbroken elec- trical ground to minimize the possibility of personal in- jury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for elec- trical ground when installed in accordance with NEC (National Electrical Code), ANSI/NFPA (National Fire Protection Association), latest edition, and local elec- trical codes. Do not use gas piping as an electrical ground. Failure to follow this warning could result in the in- staller being liable for personal injury of others.
Fig. 8 Ð Flue Hood Details
Fig. 9 Ð Gas Piping Guide (With Accessory
FIELD POWER SUPPLY Ð All units except
Refer to unit label diagram for additional information. Pig- tails are provided for ®eld service.
When installing units, provide a disconnect per NEC. Use copper conductors only when splice connectors are used.
All ®eld wiring must comply with NEC and local require- ments. In Canada, electrical connections must be in accor- dance with CSA (Canadian Standards Association) C22.1 Canadian Electrical Code Part One.
Install conduit through side panel openings indicated in Fig. 7. Route power lines through connector to terminal con- nections as shown in Fig. 10.
On
NOTE: If
FIELD CONTROL WIRING Ð Install a
NOTE: For wire runs up to 50 ft, use no. 18 AWG (Ameri- can Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly con- nected to the thermostat and will require a junction box and splice at the thermostat.
8