Ltu 40-75 Series - Heater Assembly - Space-Ray LTU SERIES Installation And Operation Instructions Manual

5.0) LTU 40-75 SERIES — HEATER ASSEMBLY
1. Loosen the reflector clamps on the tube support/hanger brackets as shown on the next page. Do not relocate the tube
support/hanger brackets, especially at the control box end of the heater.
2. Slide the end of the main reflector back to the first tube support/hanger bracket.
3. Place the flanges of the control end reflector flush with the end of the main body reflector. Secure by sliding speed clips
onto reflector edges. Evenly space speed clips on sides and top of reflectors to provide a snug fit. Place foot end
reflector (not shown) on the opposite end of the body reflector and secure as above.
4. Attach the control box to the right-hand control tube flange and secure with 1/4-20 locknuts. See below.
5. The control box must be mounted with the perforated fresh air plate on top, facing the ceiling.
6. Attach the draft inducer assembly to the left-hand draft inducer tube flange and secure with 1/4-20 locknuts. See below
A flue restrictor plate is attached to the draft inducer weld studs. Make sure this remains in place while the draft inducer
is being attached to the heater body.
7. Slip the plastic vacuum air tube over the 1/4" O.D. aluminum tube end of the draft inducer. See below. The air tube
should be shortened to prevent a downward sag which could allow condensation build-up in the tube.
8. Insert motor lead wires through the strain relief bushing of the control box and connect to L1 and L2 of terminal block.
See below. Refer also to the wiring diagram in Section 18.
9. Slide the body reflector back toward the control box. Make sure that there is a two-inch gap between the control box and
the main reflector.
10. Reflectors should overlap 1" to 3" and must be secured by sliding speed clips on the reflector edges. One speed clip is
required for each side of the reflector. Tighten the reflector clamps once the reflectors are secured with speed clips. DO
NOT OVER TIGHTEN the reflector clamp in the middle of the first body section. Make sure that the reflector can slide
under the clamp during heater operation.
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Form #43155260
Mar–05