Watts SAN89 User Manual
Gauge Glass Cut-offs
No. N89S
No. N89D
Instructions for Installing
No. N89S, N89D - Low water cut-off.
Note: Install carefully and line up so that the top of switch box is reason-
ably level.
1. Remove gauge glass and cocks from boiler.
2. Install the 1⁄2" tee, with long and short nipples, on the float chamber by
inserting the short nipple in the float chamber tapping, in the end opposite
the switch, and screwing up tight with the long nipple pointing in the correct direction, depending on the location of the boiler. Fig. 1 and 2.
3. Insert long nipple into lower gauge glass tapping in boiler. Swing the entire
float chamber until the nipple is made up tight. The cut-off must be level.
Fig. 3.
4. Screw the nipple which is in the tee carrying the tubing connector into the
upper gauge glass tipping and pull up tight. Install compression coupling in
top float chamber tapping. Fig. 4.
5. Hold tube bend in position, Fig. 5, and mark tube on level with top of hex
on compression coupling. Cut off tube at this mark.
6. Slide ring and nut over end of tube. Slide end of tube into compression cou-
pling in float chamber. Tighten both couplings.
7. Install drain valve in bottom float chamber tapping. Fig. 6.
8. Re-install gauge cocks in the end of the tees and replace the gauge glass.
Fig 6.
NOTE: Open the drain valve at least once every month or more often during boiler operation to flush out sediment from the float chamber. This must
be done to insure FULL boiler PROTECTION
Single Switch Assembly (See Page 4)
(Replaces former No. 89S and No. 89A)
"DUAL" (two) Switch Assembly (See Page 3)
(Replaces former No. 89D and No. DT89A)
Maximum Steam Pressure 15 lbs.
.
Fig. 1
IS-N89
Fig. 2
Fig. 3
Flared Connection
Compression
Coupling
Fig. 4
Cut tube on Level with
Top of Hex.
Standard switch entirely suitable for millivolt service on
self-energized control circuits of gas fired heating
installations.
Fig. 5
Top of Box
Must Be Level
Fig. 6
Built-in Cut-offs
No. N93S, N193S, N101S
with Single Switch Assembly. (See Page 4)
No. N93D, N193, N101D
with "DUAL" (Two) Switch Assembly. (See Page 3)
This line of cut-offs was designed for boilers where a 21⁄2" pipe tapping is provided for the low water cut-off
and where space is limited by the boiler jacket. For boilers that do not have this tapping, use WATTS No.
N89S, N89D which is made for gauge glass connection.
Special Notice
Before leaving the job, it is recommended that the installation of the cut-off be checked under actual working conditions;
this will reveal any installation irregularities.
To check, turn on switch to burner and if water in boiler is at or above
the water line, the cut-off will allow the burner to start. Now lower the water line by draining off water from
the boiler; if the cut-off is wired and installed correctly, the burner will shut off when the water level drops to
approximately
3
⁄8" below the normal water line.
Float chamber should be flushed at least once every month or more often to remove any accumulated sediment by
opening drain valve where installed or removing drain plug.
Instructions for Installing
No. N93S, N193S, N93D, N193D
Attach cut-off to the boiler by screwing into the 21⁄2" tapping provided,
make up tight with the "TOP" marking uppermost and the adjacent flat
edge of the square flange is exactly level. Before installing No. N93S,
N93D, be sure that there is a minimum distance of 2
1
⁄4" between the
inside of the boiler shell and any wall or other protrusion inside the boiler. (See Figure 1.) Maximum Steam Pressure 15 lbs.
Fig.1
Insertion
Length
1
2
⁄4"
N93
Only
Marked Top
Level
N93
N193
No. N101S, N101D
Attach cut-off to boiler as in Fig. 2 using a 21⁄2" close or space nipple
to suit installation requirements. Make up tight with float chamber levelled in position shown. Attach drain valve. Maximum Steam Pressure
15 lbs.
No. N50S, N50D, N501S, N501D
Watts Series N50 and N501 are designed with a heavier float and bellows construction for protection of hot water space heating boilers
against emergency low water conditions. Float chamber has 1" female
top and bottom connections, for equalizing pipe connection. (See
Figure 3). Maximum Boiler Pressure 50 lbs. @ 250°F.
For installation of N501, see Figure 2.
Inside Boiler Shell
Boiler
Fig. 2
Supply
Fig. 3
Drain Valve
Cut-off Line
1
2
⁄2" Nipple
Equalizing
No. N50
Drain Plug
N101
N501
Pipe
Equalizing
Pipe
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