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UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K
Field-removal of heat exchanger tube support—unit sizes 030–125 (optional): in some cases, the heat
exchanger tubes may have shifted during shipment, causing vibration noise against the support during unit
operation. The primary function of the heat exchanger tube support is to support the heat exchanger tubes during
shipment. This support can be removed without affecting the operation of the unit. It is recommended that the
support be removed prior to installing the unit as follows:
a. Remove discharge air louvers, taking care not to lose springs.
b. Remove and discard two screws that secure heat exchanger support located on top of unit.
c. Remove heat exchanger support through discharge opening and discard support.
Reinstall discharge air louvers.
Check to see if there are any field-installed options (refer to Table 9) that need to be assembled/installed prior
to unit installation. Ensure that all options ordered are at the installation site.
Table 9. Field-Installed Options
Option Description
CC1 Vent cap
CC2 Vertical vent/combustion air inlet terminal kit
CC6 Horizontal through-wall vent
CC21 SST vent cap
CD1 Vertical louvers to provide wider throw pattern
CD2 Downturn nozzle, 25- to 65-degree variable air deflection range
CD3 Downturn nozzle, 50- to 90-degree variable air deflection range
CD4 Downturn nozzle, 25- to 65-degree variable air deflection range with vertical louvers
CD5 Downturn nozzle, 50- to 90-degree variable air deflection range with vertical louvers
CE1 Manual shutoff valve, natural gas or propane
CD9 Duct flange
CD10 Inlet blower and belt guard
CD11 Polytube adapter
CD12 Inlet blower guard
CG1 Stepdown transformer, 208V/115V
CG2 Stepdown transformer, 230V/115V
CG4 Stepdown transformer, 460V/115V
CK8 Adapts 3/8-inch hangers for two-point suspension from 1-inch threaded pipe
CK10 Adapts 3/8-inch hangers for four-point suspension from 1-inch threaded pipe
CK22 Angle brackets for low ceiling mounting (does not include hanger rods)
CL1 Single-stage thermostat
CL22 Two-stage thermostat
CL31, CL32
Multiple fan control: option CL31 includes components for one control unit and one additional unit—
option CL32 includes components for each additional non-control unit
CM1 Locking cover for CL1 thermostat
CM1B Locking cover for CL22 thermostat
CM3 Bracket assembly for mounting thermostat on unit
DJ20 High-elevation conversion
DL2 Propane conversion
Heater Suspension
⚠ WARNING ⚠
• Before suspending the heater, check the supporting structure to be used to verify that it has
sufficient load-carrying capacity to support the weight (refer to Weights section) of the unit.
• The heater must be level for proper operation. DO NOT place or add additional weight to a
suspended heater.
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