Trane TR250 Service & Installation Manual page 10

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FDXLHAK1930 (sold separately) may be necessary.
3. If installing indoors, select the appropriate high-altitude indoor vent pressure switch from the indoor
adapter kit or from the FDXLVPS1931 kit. Each switch has a label which identifi es which model(s) and
altitude range(s) it is designed for.
4. If connected, turn pump, main gas valve, and heater power off.
5. Remove heater front access door.
6. Remove the 4 #10 hex head screws that fasten the blower air inlet plate to the blower, and remove the
blower air plate and discard. Save the 4 screws as they will be needed to install the new plate.
See Figure 26 (page 47).
7. Install the appropriate blower plate from the kit using the 4 screws. It may be helpful to drive the screws
in and out of the plate outside of the heater fi rst to "thread" the holes before installing it in the heater.
8. If the installation is confi gured for indoor venting, a special high-altitude vent pressure switch must be
installed. Follow the instructions for vent kit installation (page 14), but use the appropriate blower air
inlet plate and vent pressure switch for your altitude.
9. Re-install heater front door.
10. If connected, turn pump, main gas valve, and heater power back on.
11. Activate heater and check for proper function.
Table 1 lists the maximum altitudes each model is designed for with: a) no modifi cations, b) the included
conversion plate installed, and c) the accessory conversion kit FDXLHAK1930 installed (sold separately).
Heater
Fuel
Model
No Modifi ca-
tions to Heater
TR250NA NAT
TR250LP LP
TR400NA NAT
TR400LP LP
* All indoor installations at altitudes above 2,000 ft also require a special vent pressure switch to be installed in ad-
dition to the blower air inlet plate. The special vent pressure switch is included with the appropriate indoor vent kit
(UHXNEGVT1xxx or UHXPOSHZ1xxx), or the high-altitude vent pressure switch kit FDXLVPS1931.
Outdoor Installation
Included Con-
version Plate
Installed on
Heater
5,400 ft 10,100 ft
2,000 ft 7,700 ft
10,100 ft N/A
2,000 ft 7,7000 ft
TABLE 1
Maximum Installation Altitude
Conversion kit
FDXLHAK1930 No Modifi ca-
Installed on tions to Heater
Heater
N/A 2,000 ft
10,100 ft 2,000 ft
N/A 10,100 ft
10,100 ft 2,000 ft
Indoor Installation*
Included Con- Conversion kit
version Plate FDXLHAK1930
Installed on Installed on
Heater Heater
10,100 ft
7,700 ft 10,100 ft
N/A
7,700 ft 10,100 ft
N/A
N/A