Step 7 — Make Electrical Connections
Unit cabinet must have an uninterrupted, unbroken electri- cal ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control com- partment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code), ANSI/NFPA, latest edition, and local electrical codes. Do not use gas piping as an electrical ground. Fail- ure to follow this warning could result in the installer being liable for personal injury of others.
FIELD POWER SUPPLY — All units except
Refer to unit label diagram for additional information. Pig- tails are provided for field wire connections. Use factory- supplied splices or UL (Underwriters’ Laboratories) approved copper/aluminum connector.
When installing units, provide a disconnect per the NEC.
All field wiring must comply with NEC and local requirements.
Install field wiring as follows:
1.Install conduit through side panel openings. For units without electric heat, install conduit between disconnect and control box.
2.Install power lines to terminal connections as shown in Fig. 9.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (see Table 2). On
FIELD CONTROL WIRING — Install a
Route thermostat cable or equivalent single leads of colored wire from subbase terminals through connector on unit to low- voltage connections (shown in Fig. 10).
NOTE: For wire runs up 50 ft, use no. 18 AWG (American 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 connected to
BLOWER
ACCESS
PANEL
Fig. 7 — Flue Hood Details
LEGEND
NFGC — National Fuel Gas Code *Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
STEEL PIPE | X |
NOMINAL DIAMETER | DIMENSIONS |
(in.) | (feet) |
1/ | 6 |
2 |
|
3/ or 1 | 8 |
4 |
|
11/ or larger | 10 |
4 |
|
Fig. 8 — Gas Piping Guide (With Accessory
the thermostat and will require a junction box and splice at the thermostat.
Pass the control wires through the hole provided in the cor- ner post; then feed wires through the raceway built into the corner post to the
HEAT ANTICIPATOR SETTINGS — Set heat anticipator settings at .14 amp for the first stage and .14 amp for second- stage heating, when available.
8