Carrier FMU5X - Page 4

FMU5X, FMU5Z: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
For Conversion to Horizontal Return:
1. Remove the back panel from the casing assembly.
2. Using the dimples on the back of the casing as a guide, pre-cut the
insulation and remove to prevent damage that may occur while
cutting the new return opening.
3. Cut the return opening into the sheet metal using the dimples as a
guide.
4. Reinstall the back panel on to the casing.
5. Field fabricate and mount a cover panel to completely seal bottom
return opening of the fan coil.
After Mounting Unit, Install Refrigeration Tubing as Follows:
1. Route tubing to connection points.
2. Remove plugs from liquid and vapor lines.
3. Wrap the TXV with a wet rag to prevent overheating.
4. Shield casing insulation with sheet metal in the area you will be
brazing.
5. Braze connections using either silver bearing or non-silver bearing
brazing material. Do not use soft solder (materials which melt
below 800°F / 427°C). Consult local code requirements. Always
flow nitrogen through the system refrigerant lines while brazing.
Pressurize system and leak test. Repeat procedure until leak free.
A170308
Fig. 2 – Dimensional Drawing
Table 5 – Dimensional Data
Model Size
Dimensions- inches [mm]
Unit Operating Weight
lbs (kg)
ABCD
18
37-1/4 [946] 34-11/16 [881] 30 [762] 6-1/2 [165] 6-1/2 [165]
24
37-1/4 [946] 34-11/16 [881] 30 [762] 6-1/2 [165] 6-1/2 [165]
30
49-1/4 [1251] 46-11/16 [1186] 42 [1067] 6-1/2 [165] 6-1/2 [165]
36
49-1/4 [1251] 46-11/16 [1186] 42 [1067] 6-1/2 [165] 6-1/2 [165]