TYPICAL SUSPENSION METHODS
Various means of suspending the heater can be used. See the following drawings for typical examples.
1. Use only noncombustible materials for suspending hangers and brackets.
2. A minimum No. 2 chain with a working load limit of 115 lbs. is required.
3. Turnbuckles can be used with chains to allow leveling of the heater. All “S” hooks and eye bolts must be manually crimped closed by the installer.
4. When using rigid means for heater suspension (rod, flat bar, etc.) provide sufficient lengths or swing joints to compensate for expansion. See Figures b and c.
5. Heaters subject to vibration must be provided with vibration isolating hangers.
6. Heaters must not be supported by gas or electric supply lines and must be suspended from a permanent structure with adequate load capacity. Space-Ray recommends that the tube sections be suspended using chains with turnbuckles. This will allow slight adjustments after assembly and heater expansion/ contraction during operation. If a “trapeze” method is used for tube support/hanger brackets (shown below), the minimum chain length for the two connecting chains is 36” to minimize any vibration that might be generated by the draft inducer assembly. If these chains must be less than 36”, then do not use the trapeze method and, instead, use individual chains on each tube support/hanger bracket.
During field assembly of the heater, the recommended procedure is as follows:
1. Put the suspension in place (according to Section 7.0) using proper suspension method.
2. Lift the tube section and suspend it into place. When lifting, caution should be used to avoid damaging the assembly. Make sure that the long axis of heater is level.
3. Assembly the reflectors onto the tube section. Leave 3” space between the tube flange and the first reflector for later mounting of control box and draft inducer.
4. Place the flanges of the control end reflector flush with the end of the first reflector. Secure by sliding speed clips onto reflector edges. Evenly space 6 speed clips on sides and top of reflectors to provide a snug fit. Place foot end reflector on the opposite end of the reflector and secure as above.
5. Attach the control box to the right-hand control tube flange and secure with 1/4-20 locknuts. 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. A flue restrictor plate is attached to the draft inducer weld studs. DO NOT DISCARD RESTRICTOR PLATE DO NOT DISCARD RESTRICTOR PLATE DO NOT DISCARD RESTRICTOR PLATE and 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 and the air switch probe in the control box. 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. Refer also to the wiring diagram in Section.
9. Reflectors should overlap 3” in the middle and must be secured by sliding speed clips on the reflector edges. One speed clip is required for each side of the reflector. 10. Fasten the first reflector to the tube support/hanger bracket with (2) #10 sheet metal screws according to Detail “A”. Mount the sliding reflector clamps (#42769010) per Reflector Clamp Installation (Detail “B”) on all tube support/hanger brackets. Make sure the reflector can slide under the clamp during heater operation.
Contact Person: Ms. Juliet Zhu