KKK-A-1822 E
conditioning systems that can be made to collectively operate using re-circulated air and outside
ambient air and shall be capable of maintaining interior temperature of 20° C to 26° C (68° F to
78° F) when operated between -18° C to 35° C (0° F to 95° F) outside ambient temperature.
Ambulance shall be tested in accordance with AMD Standard 012.The air systems shall be high
volume capacity with low velocity delivery for minimum draft circulation while providing a positive
pressure within each closed compartment (positive pressure may be attained through the fresh
air ventilation system either apart from or as an integral part of the heating/air conditioning system).
Environmental system components shall be readily accessible for servicing at the installed
location(s). Connecting hoses for heating and the air conditioning system shall be supported by
rubber insulated metal clamping devices at least every 30 cm (12 in.). The driver and patient
compartment environments shall not in any way be dependent upon each other.
3.13.2
DRIVER'S COMPARTMENT ENVIRONMENTAL EQUIPMENT.
The driver's compartment shall be furnished with the chassis manufacturer's hot water,
fresh air, high capacity, heater, defroster, and air conditioning system. The patient
compartment heater shall be installed in a manner that does not adversely affect the chassis
manufacturer's FMVSS 103 performance certification for windshield defrosting.
3.13.3
PATIENT COMPARTMENT ENVIRONMENTAL EQUIPMENT.
The patient compartment shall be heated, ventilated, and air conditioned in accordance
with the criteria specified herein. During the performance testing (see 4.4.2) of the heating
and air conditioning systems, the use of fans or blowers, within the test chamber, is only
permitted to provide air circulation to help maintain the required ambient test temperature.
The use of these fans or blowers to direct air through the vehicle's radiator and/or
condenser(s) is not permitted.
3.13.4 HEATING CRITERIA.
The heating system(s) shall have sufficient capacity to simultaneously raise the temperature
at the midpoints, in each compartment, to a minimum dry bulb temperature of 20° C (68°
F), at all twelve test points (9 patient compartment and 3 cab) within 30 minutes. Test
conditions: the ambulance (with doors open) shall be cold soaked for three hours in an
ambient temperature of (0° F), then the engine started and allowed to run at the high-idle
setting (see 3.7.6) while the transmission is in park or neutral. Three verification readings
shall be made (start, middle, and final) by nine equally spaced test thermocouples in the
patient compartment, and three in the cab compartment. Heating equipment may be in the
recirculating mode and all compartment openings, including partition doors/windows and
exhaust vents, shall be closed. Heater(s) furnished shall comply to applicable Motor Carrier
Safety Regulation 393.77. Heater(s) shall, to the maximum extent possible, be connected
to the chassis manufacturers furnished interconnection points. When interconnection points
are not furnished, chassis manufacturers unused engine water pump supply ports shall be
utilized. All added heater hose shall meet or exceed chassis manufacturers requirements
and when specified (see 6.2-fff), silicone hoses shall be furnished.
3.13.5 AIR CONDITIONING CRITERIA.
The air conditioning system(s) shall have sufficient capacity to simultaneously lower the temperature
at the midpoints in each compartment to a maximum dry bulb temperature of 26° C (78° F), at
all twelve (9 patient compartment plus 3 cab) test points within 30 minutes. Test conditions: the
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