Mars 33833 User Manual
Sequencers
MARS SERIES 338
33844
33841
Electric Heat Sequencers
he MARS2 heat sequencers are used in a variety of
T
applications, including electric furnaces, baseboard heaters,
heat pump blower control and heating element control. The
sequencers stage electric heat to prevent circuit overload.
These units operate by means of a PTC (positive
temperature coefficient). The PTC is self current limiting,
ensuring stable switching action over a wide range
of voltages.
Features:
• Solid state dependability
• Replaces Honeywell, White Rodgers, and Klixon
• 12.5A to 25A contact ratings
• Quick connect terminals
• Various mounting positions
• Shock & vibration resistant
• Ambient rated from -50ºF to 165ºF
• Full-load rated auxiliary contacts
Single Load Contact Ratings
RESISTIVE
(non-inductive)
VAC WATTS AMPS
120 3000 25 10A 60A 125VA
240 6000 25 5A 30A 125VA
480 6000 12.5 3A 18A 480VA
Combined Load Ratings:
MARS2
30A @ 240VAC - Total: 23A non-inductive + 7FLA / 42LRA inductive
Life at rated current: 10,000 cycles
FULL LOAD
MARS2 TIMINGS-ON TIMINGS-OFF
NO. TIMINGS SWITCHES M1-M2 M3-M4 M5-M6 M7-M8 M9-M10 M1-M2 M3-M4 M5-M6 M7-M8 M9-M10
33841 111-20 ----40-110 ----
33842 11--30 - 90 -- --1-30 --
(1)
33844
33845 12--30 - 90 30 - 90 ---1-30 1-30 -
(1)
33832
(1)
33833
(1)(2)
33848
(1) M1-M2 and M3-M4 are always first switches to turn ON and to turn OFF. All other switches are random ON and random OFF
(2) #33848 - switch contacts designated F1-F2 instead of M1-M2
121-20 1-20 -- -40-110 40 - 110 ---
231-110 1-110 1-110 --1-110 1-110 1-110 -241-110 1-110 1-110 1-110 - 1-110 1-110 1-110 1-110 451-160 1-160 1-160 1-110 1-160 1-160 1-160 1-160 1-160 1-160
MOTOR RATINGS
(inductive)
LOCKED
ROTOR
PILOT DUTY
These contacts switch simultaneously
ON TIME – Elapsed time to make contacts after heater is energized (Min. to Max.)
OFF TIME – Elapsed time to make contacts after heater is de-energized (Min. to Max.)
OFF Timings determined after PTC heater has been electrified for a total of 5 minutes.
M2-16
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