157
Electrical
Features:
• Automatic & manual reset*.
• Corrosion resistant.
• Environmentally sealed (water tight switched).
• Non-position-sensitive.
• Low/high pressure cycling.
• Condenser fan cycling.
• Variety of fixed pressure settings.
• Complete with 1/4 inch SAE female flare fitting
with valve core depressor.
• 18 inch leads (longer lead lengths available).
*Note: Automatic reset controls may be used to replace manual reset controls.
Electrical Connection
The miniature pressure controls are supplied with 12
inch, 18 AWG stranded leads, stripped 1/2 inch. RML
and RMF are blue – RMH are black.
Pressure Connections
1/4 inch, SAE female flare fitting with valve core
depressor.
Fittings
All RML, RMF and RMH controls are individually
packaged and equipped with a 1/4" SAE female flare
fitting. For application requiring a pressure connector
other than 1/4" female flare, use an appropriate adapter
or connector.
Example: 02-C31004 – 1/4" SAE male flare to 1/4" tube adapter
02-C31482 – 1/4" SAE male flare to 1/8" MPT connector
Settings
All RML, RMF and RMH controls will have pressures
stamped on the control. Normally, the OEM’s pressure
is stamped on the control.
Manual Reset
Automatic reset controls may be used to replace
manual resets.
Electrical Ratings
Electrical ratings must not be exceeded and all
electrical connections must comply with local approval
authorities.
Temperature
Operating Ambient -20° to 150°F (-28° to 65°C).
Refrigerant
-35° to 275°F (-37° to 135°C).
Automatic Reset Pressure Controls
Miniature pressure controls are fixed setting controls
used on refrigeration, air conditioning, or heat pump
systems using R12, R22, or R502 refrigerants. Both
low (suction) and high (discharge or head pressure)
sensing controls are available.
These single function controls, single pole, single
throw (SPST) switches may be used in a variety of
applications: direct control of single speed fan motors
or compressors; in conjunction with a contactor for pilot
duty; or to control electronic management systems.
The RMF Miniature Pressure control will cycle a single
speed condenser fan when the predetermined head
pressure (cut in) is reached. When the head pressure
is reduced to a predetermined pressure (cut out), the
fan will shut off. (Normally open switch). CSA & UL
approved.
Automatic Reset Miniature Pressure Controls
Pressure Control Switches
Part #
Application
Setting
(psig)
Cross Reference
Cut
Out
Cut
In
25-RML-520
Low
Pressure
Cut Out
5 20
33329, PS-LP05-20, PC002.
25-RML-1025
10 25
33330, PS-LP10-25, 3100-050.
25-RML-1535
15 35
33333.
25-RML-1555L
15 55
Long Lead (30").
25-RML-2045
20 45
25-RML-2580
25 80
33362, 33363, 33336, PS-LP25-80,
3100-051.
25-RML-3560
35 60
PC001.
25-RML-4080
40 80
33364, PS-LP40-80, 3100-052.
25-RML-4560
45 60
33339.
25-RML-90120F
90 120
25-RMF-75120
Condenser
Fan Cycling
75 120
25-RMF-110170
110 170
25-RMF-150225
150 225
25-RMF-190275
190 275
33341.
25-RMF-300400
300 400
25-RMH-250180
High
Pressure
Cut Out
250 180
33350.
25-RMH-300200
300 200
33310, 33355, PS-HP300-200.
25-RMH-325225
325 225
33313.
25-RMH-350250
350 250
33316, 33356, PS-HP350-250,
3100-150, PC150.
25-RMH-375275
375 275
33319.
25-RMH-400300
400 300
33322, 33357, 33358, PS-HP400-
300, 3100-151, PC151.
25-RMH-425325
425 325
33325, 33359, PC100.
VAC FLA LRA PD VA
24 -
-
48
120 10 40 375
240 5 20 375
277 -
-
37
29-RML-2045
Illustrated
Pressure Controls
