NuTone IM-440 Series - Manual (Page 7)

7
CONNECTING THE
POWER TRANSFORMERS
1. Refer to Figure 14. The transformers’ primary leads
should already be connected to the 120 volt AC house
supply wiring. Be sure power is off before connecting
transformers to master unit.
2. Locate the two (2) sets of red/wht transformer leads on
the lower left corner of the master unit. Connect one pair
of low voltage leads to each transformer located in the
bottom of the rough-in.
INSTALLATION (Continued)
IMPORTANT WARNING!
THE POWER TRANSFORMER CONTAINS AN
INTERNAL FUSE.
DO NOT SHORT THE LOW VOLTAGE CONNECTING
SCREWS OF THE TRANSFORMER OR THE
TRANSFORMER WILL BE DESTROYED!
CAUTION
BE SURE THE AC POWER IS OFF BEFORE
CONNECTING THE POWER TRANSFORMERS. DO
NOT TURN AC POWER ON TO TRANSFORMERS
UNTIL ALL WIRING AT THE REMOTE AND MASTER
STATIONS IS COMPLETE!
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FIGURE 14
FIGURE 15
MOUNTING THE TRANSFORMER COVER
IMPORTANT: The transformer cover must be installed
for proper operation of the intercom.
1. Refer to Figure 15. Remove the left front and right rear
screws from the transformer enclosure. Set screws aside
for later installation.
2. Position the transformer cover (with insulator positioned
towards transformers) over the transformer enclosure so
holes in cover align with holes in enclosure.
3. Fasten cover with two (2) screws previously removed.