39
VI. Water Piping and Trim
A. Factory Supplied Piping and Trim (continued)
b. Locate 3/4 in. NPT x 12 in. black nipple, 3/4
in. FPT x 1 in. FPT safety relief valve, and 3/4
in. NPT drain valve. Install nipple in top run
of 3/4 in. NPT tee connected to supply in Step
a. Mount safety relief valve onto nipple. Install
drain valve in bottom run of 3/4 in. NPT tee
connected to Supply in Step a.
c. Locate 2 in. x 2 in. x 1/2 in. NPT black tee, one 2
in. NPT x 2-1/2 in. black nipple, and 1/2 in. NPT
temperature and pressure gage. Install nipple
into 2 in. x 2 in. x 3/4 in. NPT tee installed in
Step a. Install 2 in. x 2 in. x 1/2 in. NPT tee onto
nipple, making sure branch is oriented towards
front of boiler. Then, install temperature and
pressure gage onto tee branch.
d. Locate 2 in. x 2 in. x 1 in. NPT black tee and
second 2 in. NPT x 2-1/2 in. black nipple.
Install nipple into 2 in. x 2 in. x 1/2 in. NPT
tee installed in Step c. Install 2 in. x 2 in. x 1
in. NPT tee onto nipple, making sure branch is
oriented upward.
e. Locate flow switch kit. Remove flow switch
and paddles from packaging carton. See Taco
Instruction Sheet for Flow Switch Kit (supplied
with flow switch) for specific details.
f. For APX625, select paddle stamped “3”.
g. For APX725, select paddle stamped “1”.
h. Attach paddle to flow switch stem using supplied
machine screw.
i. Apply pipe dope to flow switch at threaded brass-
bushing end. Then, mount the switch threaded
end with attached paddle into 2 in. x 2 in. x 1 in.
NPT tee branch and tighten such that distance
between bottom of switch housing and top of tee
branch is approximately 1-11/16 in. (43 mm).
Insure switch paddle is positioned perpendicular
to flow direction for best flow sensitivity. Do
not tighten switch by grasping switch enclosure.
Use wrenching flats on bushing only. The
turning radius required for switch mounting is
3 in. (80 mm).
j. For flow switch wiring, refer to Section VIII
“Electrical” of these instructions.
3. Model APX825 (see Figure 19C “Factory
Supplied Piping and Trim Installation -
APX825”)
a. Locate and remove ¾ in. NPT x close black
nipple, ¾ in. NPT x 12 in. black nipple, ¾ in.
NPT black tee, ¾ in. FPT x 1 in. FPT safety
relief valve and ¾ in. NPT drain valve.
Figure 19C: Factory Supplied Piping and Trim Installation - APX825
Summary of Contents for APEX
Page 57: ...57 VIII Electrical continued Figure 26 Ladder Diagram ...
Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
Page 105: ...105 ...
Page 109: ...109 XIII Repair Parts continued APX625 APX725 and APX825 APX825 shown ...
Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
Page 114: ...114 XIII Repair Parts continued APX625 APX725 and APX825 ...
Page 122: ...122 ...
Page 123: ...123 ...
