TM-9-2320-280-10 HMMWV Operator Manual Download
Page 219 of 405
TM 9-2320-280-10 2-40. ARCTIC OPERATION (A2 VEHICLES) a. General . Arctic winterization kits are for use during extremely cold temperatures from 0°F (-18°C) to -50°F (-46°C). CAUTION • Do not operate arctic heater in ambient temperatures above 0°F (-18°C), or with temperature switch in “HI”position, when temperature is above -25°F (-32°C). Damage to equipment may result. • Close battery box door after 30 minutes of arctic heater operation or when engine is running. Failure to do so may result in damage to batteries. b. Starting Arctic Heater. (1) Set temperature switch (4) on heater control box (1) to “LO" position. (2) Move start switch (3) on heater control box (1) to "START” position and hold for approximately 2 minutes or until heater starts and yellow indicator lamp (2) comes on. NOTE If the start switch is moved from the “START”to “ON" position too quickly, the heater flame will be extinguished and the heater will need restarting. (3) When heater starts, move start switch (3) on heater control box (1) to “ON" position. If heater does not start, move start switch (3) to “OFF" position for 10 seconds and then back to "START” for 60 seconds. Repeat procedure if heater doesn't start. c. Starting Engine With Arctic Heater Assistance. (1) Pull defroster control knob (9) all the way out to ensure hot air is not directed on windshield. (2) Pull exhaust diverter cable knob (6) out to allow heater exhaust to heat the engine oil pan. (3) Open battery box door (8), by sliding away from plenum (7), to heat batteries. (4) Move regulator control lever (5) up to "STANDARD HEAT”position. CAUTION Do not operate arctic heater in ambient temperatures above 0°F (-18°C), or with temperature switch in “HI” position, when temperature is above -25°F (-32°C). Damage to equipment will result. (5) Start arctic heater and set temperature switch (4) on heater control box (1) to “LO” position for temperatures from 0°F (-18°C) to -25°F (-32°C), or “HI” position for temperatures from -25°F (-32°C) to -50°F (-46°C). (6) Operate heater for 30 minutes maximum at -50°F (-46°C); less time may be required for higher ambient temperatures. 2-160