Watts SAN89 - Manual

IS-N89
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 cor-
rect 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 dur-
ing boiler operation to flush out sediment from the float chamber. This must
be done to insure FULL boiler PROTECTION.
Maximum Steam Pressure 15 lbs.
Standard switch entirely suitable for millivolt service on
self-energized control circuits of gas fired heating
installations.
Fig. 1 Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Flared Connection
Compression
Coupling
Cut tube on Level with
Top of Hex.
Top of Box
Must Be Level
Gauge Glass Cut-offs
No. N89S
No. N89D
Instructions for Installing
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)
IS-N89.qxd 9/15/08 2:18 PM Page 1