Mars 39004 User Manual
®
Klixon Fan & Limit Switches
FAN COIL UNIT
HEATING
SIDE
LINE VOLTAGE
OPERATION
GND
LINE HOT
ROOM
THERMOSTAT
COOLING
SIDE
RETURN LINE
MOTORIZED VALVE
SUPPLY LINE
HOT OR COLD WATER
SL-8 CHANGE-OVER
SWITCH
➀
➁
➂
➀
➁
➂
ORANGE COMMON
BLUE HEAT
RED COOL
LOW VOLTAGE
TRANSFORMER
LINE
TO ROOM
THERMOSTAT
TO MOTORIZED
VALVE
LOW VOLTAGE OPERATION
®
MARS SERIES 390
Change-Over Switches for
Fan-Coil Systems
COMPONENT
39004
Leads thru side
39005
Leads thru top
1/2” conduit adapter
The MARS Series 390 change-over switches are used for
summer-winter change-over of electric thermo-stats in hydronic
heating - cooling fan-coil units.
Features:
• Color coded lea ds allow easy installation
• SL-8 thermostat is enclosed in sealed case for
trouble-free operation
• Snap-acting disc type, insures accurate
temperature repeatability
• Can be mounted in any position
• UL and CSA listings available
Installation
The SL-8 change-over switch is located on the main run of the
supply line where it can quickly sense the maximum
temperature of the hot or cold water passing through. If the SL8 switch is exposed to surrounding temperatures, thermal
insulation should be wrapped around the switch case to
maintain desired thermal response.
Specifications:
Pipe size: 5/8 in O.D.
Leads: 12 in. color coded
Switch Action: SPDT
Temperature: 88°F (31°C)—terminals 1 & 2 close, 1 & 3
open 73°F (23°C)—terminals 1 & 3 close, 1 & 2 open
Mounting: mounting clip supplied with each kit
Electrical: terminals 1 & 3 25 amp at 120/240 VAC
Terminals 1 & 2 10 amp at 120 VAC, 5 amp at 240 VAC
MARS KLIXON KLIXON
NO. KIT NO. NO. DESCRIPTION
39004 SL8-5 20425D27-160-356 leads thru
39005 SL8-5A 20425D69-160-287 leads thru top
Cross Reference
C-56
HONEYWELL MARS RODGERS MARS
NO. REPLACEMENT NO. REPLACEMENT
L6076A 39004 752-1 39004
L6076B 39005 752-2 39005
The largest selection of motors, components, and accessories for the HVAC/R Industry
WHITE
side of cup
of cup with 1/2”
conduit adapter
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