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d. For gas-fired unit heater models UBX, UBXC, UBZ, UDX, UDXC, UDZ, and UEZ (see
(1) At rear of heater, remove and save screws from edge of cabinet bottom.
(2) For model UBX, UBXC, UBZ, UDX, UDXC, and UDZ unit sizes 150–400 and all UEZ models, align relay
assembly (1) as shown and use bracket as template to drill hole in edge of cabinet bottom as shown.
(3) Secure relay assembly (1) and cable clamp (3) as shown using existing screws for model UBX, UBXC,
UBZ, UDX, UDXC, and UDZ unit sizes 30–125 or one existing screw and one screw (2) from kit for model
UBX, UBXC, UBZ, UDX, UDXC, and UDZ unit sizes 150–400 and all UEZ models.
3
1
UBX, UBXC, UBZ, UDX, UDXC, UDZ
(30–125)
Figure 6. Relay Installation—Models UBX, UBXC, UBZ, UDX, UDXC, UDZ, and UEZ (Refer to
4. Determine control wiring configuration. Do not exceed length and distance listed in
Size
(AWG)
12
14
18
*
For complete circuit.
OPT-CL31,32 (02-25) 1042699-E
EXISTING
SCREWS
Table 3. Control Wiring Specifications
Maximum Length
DRILL
1
UBX, UBXC, UBZ, UDX, UDXC, UDZ (150–400)
UEZ (55–310)
*
Feet (Meters)
2100 (640)
1300 (457)
500 (152)
Figure
6):
3
Table
Table
3.
Maximum Distance
1050 (320)
650 (198)
250 (76)
2
2)
5
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