| Tweet |
Custom Search
|
|
|
||
 TB 740-97-4
(c) Humidistat. A hair-type humidistat will be set to maintain a 40 percent relative humidity, plus or minus 5 percent, within the
dehumidified areas. The humidistat will be installed in the engineroom approximately 3 feet above the floor plate level and 3 feet
from the moist-air duct openings. It will be securely fastened to a bracket attached to the pump engine or other convenient structure.
The manufacturer's instructions will be followed in making the electrical connections. The humidistat will be connected to the
dehumidification machine by means of No. 18, two-conductor, rubber covered cable with suitable terminal connectors. The cable will
run from the humidistat, through the fidley portlight cover, to the dehumidification machine.
(d) Sensing elements. Humidity sensing elements will be installed, one each, in the engineroom, the crew quarters and the
lazarette. The sensing elements will be installed as follows:
1. Crew quarters. The galley intake vent will be covered with a blank fabricated from No. 18 gauge sheet metal, or -inch
exterior grade plywood. The blank will be provided with an opening to receive the moist-air return duct. The sensing element will be
mounted in the side of the duct just above the connection to compartment opening. The sensing element will run down inside the
duct and will be supported clear of the ends of the duct in a manner to secure it against motion and contact with metal or other
conducting surfaces.
2. Engineroom. The lube oil tank vent opening will be covered with a blank fabricated from No. 18 gauge galvanized sheet
metal, or -inch exterior grade plywood. The blank will be provided with bolt holes to match existing bolts and with a hole for
mounting the sensing element contact. The union in the lube oil fill line will be broken, and the sensing element will pass through the
fill line into the engineroom as far as the cable permits. The element will be secured to prevent motion and contact with metal or
other conducting surfaces.
3. Lazarette. The tiller access cover plate shall be removed and covered with a blank fabricated from No. 18 gauge
galvanized sheet metal, or -inch exterior grade plywood. The blank will be provided with a hole for passage of the sensing element
cable. The sensing element contact will be mounted in such a manner that it does not fit flush with the deck. The sensing element
will pass downward, through the blank as far as the cable permits and will be secured against motion and contact with metal or other
conducting surfaces.
Change 2
S-3
|
||
|
||
