Reznor UBX Manual

Revision: UBX-UBZ-UDX-UDZ-HX (02-22) 1037154-0
HEAT EXCHANGER GASKET KIT INSTALLATION
FOR UNIT HEATERS
Supersedes: — (Original Version)
MODELS UBX, UBZ, UDX, AND UDZ
Table 1. Heat Exchanger Gasket Kit Components
Item
No.*Component Size
Unit Size
030, 045 060, 075 100, 125 150, 175, 200 225, 250 300, 350, 400
Kit PN
1036360 1036361 1036362 201670 201671 201672
Component PN (Quantity)
1Top/bottom header
panel gasket
5/8 × 21-3/8 1033925 (2) 1033925 (2) 1033925 (2) —
1 × 35-23/64 — 194533 (2) 194533 (2) 194533 (2)
2Front/rear heater
panel gasket
5/8 × 12-5/8 1033922 (2) —
—5/8 × 15-5/8 — 1033923 (2) —
5/8 × 23-5/8 — 1033924 (2)
1 × 20-3/16
—
195986 (2) —
1 × 26-3/16 — 195987 (2) —
1 × 34-3/16 — 195988 (2)
3Tube support
gasket
1 × 89-7/32 201424 (1) —
1 × 95-7/32 — 201425 (1) —
1 × 103-7/32 — 201426 (1)
*See Figure 1.
INSTALLATION
⚠ DANGER ⚠
• Improper installation could result in death, serious injury, and /or property damage.The qualified
agency performing this work assumes responsibility for this installation.
• Proper installation and sealing of the heat exchanger to the heater is necessary for reliable and
safe operation. Failure to properly install could result in property damage, personal injury, and/
or death.
• The replacement heat exchanger should be installed by a qualified service agency in compliance
with all codes and requirements of authorities having jurisdiction.
NOTE: Unit sizes 030–125 require the installation of four (4) gasket strips. Unit sizes 150–400 re-
quire the installation of five (5) gasket strips.
Install the heat exchanger gasket kit as follows (item numbers refer to Figure 1):
•To prevent damage during shipping or storage, gasket kits for replacement heat exchangers are shipped in a
parts bag.
•Gasket kits should be attached to the replacement heat exchanger at the time of installation.
•All gaskets are self-adhesive and are cut to size.
•Refer to the installation manual provided with the heater for important safety information.
•Ensure that all components listed in Table 1 are available before beginning installation.

Specifications and illustrations subject to change without notice or incurring obligations.
Latest version of this manual is available at www.reznorhvac.com.
©2022 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.
UBX-UBZ-UDX-UDZ-HX (02-22) 1037154-0
INSTALLATION—CONTINUED
Figure 1. Heat Exchanger Gasket Locations (Refer to Table 1)
1. Install header panel gaskets:
NOTE: The header panel gaskets are sealing gaskets and must cover the full length of the surface.
a. Position top/bottom (1) and front/rear (2) gaskets on outer edges of header panel and align holes—ignore
large holes in bottom gasket.
b. To apply gasket(s), start at end and gradually peel backing from gasket as it is adhered. Repeat with each strip.
2. Install tube support gasket (unit sizes 150–400):
NOTE: The tube support gasket is required to prevent vibration but is not a sealing gasket.
a. Position tube supprt gasket (3) across top, rear, and bottom of tube support.
b. To apply gasket, start at end and gradually peel backing from gasket as it is adhered.
3. Complete replacement heat exchanger installation (refer to installation manual provided with heater):
a. Inspect and clean cabinet, burner, and vent system.
a. Replace any components that are not structurally sound.
4. When installation of replacement heat exchanger is complete, start up heater (refer to installation manual
provided with heater):
a. Follow instructions on lighting instruction plate to restart heater.
b. CHECK ALL SAFETY FEATURES FOR PROPER OPERATION.
UNIT SIZES 030–125 UNIT SIZES 150–400
1
1
2
2
2
3
1
1
2