McDonnell Miller - Series 42

For residential, commercial, and industrial low and medium pressure steam boiler with a separate water column.

Monel bellows provides corrosion resistance.
Single pole, single throw mercury switches.
Optional features - quick hook-up fittings, gauge glass connector, & BSPT threads.
Maximum pressure 50 psi

Replacement Heads
Model Number	Part Number	Description	Weight lbs.	Price
42S-HD	129500	Replacement Head for 42-HD	7.5	$Call
Ordering Information
Model Number	Part Number	Description	Weight lbs.	Price
42	129300	Combination low water cut-off pump controller (OBSOLETE - USE 42-S)	15.5	$570.00
42-A	129700	42 w/ quick hook-up fittings	21.3	$Call
42-J	129400	42 w/ BSPT threads	15.5	$Call
42-N	129800	42 w/ glass connector	21.3	$Call
Replacement Parts (View parts breakdown here)
Model Number	Part Number	Description	Weight lbs.	Price
SA150-125	348300	Switch, 2 wire (REPLACE THE HEAD THAT HAS THE SNAP TYPE SWITCH )	0.3	$Call
SA42-125	341300	Switch, 2 wire	0.3	$Call
CO-12	302600	Head gasket (6 pack)	0.1	$38.10
MA-159	328300	Quick hook-up fittings	6.0	$390.00
SA259-24	351800*	Upper quick hook-up	1.7	$98.00
SA159-24	349500*	Lower quick hook-up	1.7	$101.00
SA159-17	349400*	Black "Y" assembly	2.3	$73.00

Electrical Ratings
Voltage	Pump Curcuit Rating		Pilot duty
Voltage	Full Load	Locked Rotor	Pilot duty
120 VAC	7.4	44.4	125 VA at 120 or 240 VAC
240 VAC	3.7	22.2	125 VA at 120 or 240 VAC
Alarm Circuit Rating
Voltage				Amps
120 VAC				1
240 VAC				1/2
Dimensions
Model	A	B	C	D	E	F		G
42	12 1/4	2 9/16	1	8 7/8	3 11/16	3 1/8		1/2
42-A	12 1/4	2 9/16	1	7 1/4 - 16 11/16	2 3/4	3 1/8		1/2
42-N	12 1/4	2 9/16	1	8 7/8	3 11/16	3 1/8		1/2
Model	H	J	K	L	M	N	P	Q	R	S	T
42-N	2 9/16	2 9/16	1 3/4	3 11/16	1 13/16	1 1/16	1 1/16	1 1/2	3/8	1/4	2 5/8

McDonnell Miller Series 42 Drawings

Contact Us Directly:

Toll Free: 1-800-780-3776
Int'l Phone: 770-957-9599
Int'l Fax: 770-957-9563
E-Mail: Email Your Request

Mailing Address: Power Plus International
143 McDonough Parkway
McDonough, GA 30253