Product Overview

• For commercial and industrial low or
high pressure steam boilers
• Maintains consistent water level
regardless of pressure
• Water column with integral tappings for
gauge glass and tri-cock installations
• For boilers of any steaming capacity
• No. 5 Switch included
• Magnetic repulsion eliminates need for
bellows
• Optional features
– Manual reset
• 7B switch (135ohm proportional control
signal) to maintain constant boiler water
level
• 1" NPT connections
• Maximum pressure 150 psi (10.5 kg/cm
2
)
S
ERIES
193
Series 193
Low Water Cut-Off/Pump Controllers
Model S T U V W X
193 6
3
⁄
4
(171.4) 17
1
⁄
2
(445) 20
1
⁄
2
(521) 3
1
⁄
2
(89) 3
1
⁄
2
(89) 6 (152)
193-A 6
3
⁄
4
(171.4) 17
1
⁄
2
(445) 20
1
⁄
2
(521) 3
1
⁄
2
(89) 3
1
⁄
2
(89) 6 (152)
193-B 6
3
⁄
4
(171.4) 17
1
⁄
2
(445) 20
1
⁄
2
(521) 3
1
⁄
2
(89) 3
1
⁄
2
(89) 6 (152)
193-D 6
3
⁄
4
(171.4) 17
1
⁄
2
(445) 20
1
⁄
2
(521) 3
1
⁄
2
(89) 3
1
⁄
2
(89) 6 (152)
193-G 6
3
⁄
4
(171.4) 17
1
⁄
2
(445) 20
1
⁄
2
(521) 3
1
⁄
2
(89) 3
1
⁄
2
(89) 6 (152)
Model L M N P Q R
193 12
3
⁄
4
(324) – 10
13
⁄
16
(274) 13 (330) – 2
7
⁄
8
(73)
193-A – 11
1
⁄
2
(292) 10
13
⁄
16
(274) 13 (330) 2
1
⁄
4
(57) –
193-B 12
3
⁄
4 (324) – 10
13
⁄
16 (274) 13 (330) – 2
7
⁄
8 (73)
193-D – 11
1
⁄
2
(292) 10
13
⁄
16
(274) 13 (330) 2
1
⁄
4
(57) –
193-G – 11
1
⁄
2
(292) 10
13
⁄
16
(274) 13 (330) 2
1
⁄
4
(57) –
Model A B C D E F G H J K
NPT NPT NPT NPT NPT NPT NPT NPT NPT NPT
193 1
1
⁄
2
1
⁄
2
1
⁄
2
– –
1
⁄
2
1
⁄
2
1
⁄
2
3
⁄
4
193-A 1
1
⁄
2
1
⁄
2
1
⁄
2
1
⁄
2
1
⁄
2
– –
1
⁄
2
3
⁄
4
193-B 1
1
⁄
4
3
⁄
4
3
⁄
4
3
⁄
4
– –
3
⁄
4
3
⁄
4
1
⁄
2
3
⁄
4
193-D 1
1
⁄
2
1
1
⁄
2
1
1
⁄
2
– –
1
⁄
2
3
⁄
4
193-G 1
1
⁄
2
–
1
⁄
2
1
1
⁄
2
– –
1
⁄
2
3
⁄
4
Dimensions, in. (mm)
O r dering Info r m a t i o n
Model Part Weight
Number Number Description lbs. (kg)
1 9 3 1 6 3 4 0 0 Combination low water cut-off/ 52.5 (23.8)
pump controller w/No. 5 switch
1 9 3 - A 1 6 3 5 0 0 193 w/alternate tappings 52.5 (23.8)
1 9 3 - A - 7 B 1 6 4 5 0 0 193-A w/No. 7B switch 52.5 (23.8)
1 9 3 - A - 7 B M 1 6 4 6 0 0 193-A-7B w/manual reset 52.5 (23.8)
1 9 3 - A - M 1 6 4 2 0 0 193-A w/manual reset 52.5 (23.8)
1 9 3 - B 1 6 3 6 0 0 193 w/alternate tappings 52.5 (23.8)
1 9 3 - B - M 1 6 4 3 0 0 193-B w/manual reset 52.5 (23.8)
1 9 3 - B - 7 B 1 6 4 7 0 0 193-B w/No. 7B switch 52.5 (23.8)
1 9 3 - D 1 6 3 9 0 0 193 w/alternate tappings 52.5 (23.8)
1 9 3 - D - 7 B 1 6 3 9 0 3 193-D w/No. 7B switch 52.5 (23.8)
1 9 3 - M 1 6 4 1 0 0 193 w/manual reset 52.5 (23.8)
1 9 3 - 7 B 1 6 4 4 0 0 193 w/No. 7B switch 52.5 (23.8)
1 9 3 - 7 B M 1 6 4 5 2 5 193-7B w/manual reset 52.5 (23.8)
1 9 3 - D - M 1 6 3 9 0 2 193-D w/manual reset 52.5 (23.8)
1 9 3 - G 1 6 4 7 6 0 193 w/alternate tappings 52.5 (23.8)
Electrical Ratings
345 VA at 120 or 240 VAC
51
Boiler Controls
McDonnell & Miller
L o w Water Cut-Offs – Mech a n i c a l
Combination Low Water Cut-Off/Pump Contro l l e r s for Steam Boilers
06. HotWtrLwco 50-61• 3/6/07 12:44 PM Page 51