ECONOMIZER DAMPER MOTOR — On units so equipped,
the economizer motor is located in the mixing box section.
Access to it is through the doors labeled FILTER SECTION
on the sides of the unit.
ELECTRIC HEATER CONTROL BOX (50 Series Units Only)
— Access to the electric heater control box is through the
door on the right side of the unit next to the condenser sec-
tion. See Fig. 16 and 17.
The electric heater control box contains:
• power terminal block HTB, HTB1, HTB2 (not used on all
voltages)
• fuse blocks FB1, FB2, etc.
• fuses FU (3 per fuse block)
• heater contactors HC1, HC1A, etc.
• plug No. 20 (PL20)
HEATER BOX (50 Series Units Only) —Access to the heater
box is through the door on the left side (sizes 034 and 044)
or right side (sizes 054-074) of the unit next to the con-
denser section. See Fig. 16 and 17. See Fig. 42 for heater
box contents.
NOTE: High heat consists of sections 1 and 2.
Low heat consists of section 1 only.
Fig. 37 — Gas Section Detail, 48 Series 034 and
044 Units
NOTE: High heat consists of sections 1-3.
Low heat consists of section 1 and 2 only.
Fig. 38 — Gas Section Detail, 48 Series 054-074 Units
Fig. 39 — Burner Section Detail (48 Series Units Only)
Fig. 40 — Flue Box Assembly, 48 Series Units Only
(Shown with Burner Assembly)
Fig. 41 — Combustion Blower Removal
44
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