14
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Guidance and manufacturer’s declaration – electromagnetic immunity
The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model
775 warming should assure that it is used in such an environment.
Immunity Test
IEC 60601 test level
Compliance
level
Electromagnetic environment ‑ guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2,5 GHz
3 Vrms
3 V/m
Portable and mobile RF communications equipment should be used no closer to
any part of the Model 775 warming unit, including cables, than the recommended
separation distance calculated from the equation applicable to the frequency of
the transmitter.
Recommended separation distance
d = 1.2
d = 1.2
80 MHz to 800 MHz
d = 2.3 800 MHz to 2,5 GHz
where P is the maximum output power rating of the transmitter in watts (W) according
to the transmitter manufacturer and d is the recommended separation distance in
meters (m).
Field strengths from fixed RF transmitters, as determined by an electromagnetic site
survey
a
, should be less than the compliance level in each frequency range.
b
Interference may occur in the vicinity of equipment marked with the following symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects
and people.
a
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and
FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF
transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Model 775 warming unit
is used exceeds the applicable RF compliance level above, the Model 775 warming unit should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as re-orienting or relocating the Model 775 warming unit.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications equipment and the Model 775 warming unit
The Model 775 warming unit is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or
the user of the Model 775 warming unit can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the Model 775 warming unit as recommended below, according to the maximum output power of the
communications equipment.
Rated maximum output power of
transmitter W
Separation distance according to frequency of transmitter m
150 kHz to 80 MHz
d = 1.2
80 MHz to 800MHz
d = 1.2
800 MHz to 2,5 GHz
d = 2.3
0,01
0.12
0.12
0.23
0,1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance
d
in meters (m) can be estimated using the
equation applicable to the frequency of the transmitter, where
P
is the maximum output power rating of the transmitter in watts (W) according to the
transmitter manufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects
and people.
15
GB / 34-8718-8817-7
Physical Characteristics
DIMENSIONS
13” high x 13” deep x 14” wide (33 cm high x 33 cm deep x 36 cm wide)
WEIGHT
16 lb (7.3kg)
RELATIVE NOISE LEVEL
53 dBA (High fan setting)
48 dBA (Low fan setting)
HOSE
Flexible, compatible with the Model 241 blood/fluid warming set.
Length: 80” (203 cm)
UNIT INTAKE FILTER
MERV 14*
* See Frequently Asked Questions on Filtration (p. 58)
RECOMMENDED FILTER CHANGE
Every 12 months or 500 hours of use
MOUNTING
Can be clamped to an IV pole, placed on a hard surface, bed rail mount, or
mounted to the rolling cart accessory.
Temperature Characteristics
RECOMMENDED OPERATING ENVIRONMENT
TEMPERATURE:
15°C-25°C
HUMIDITY:
Max relative humidity 80% (up to 31°C) decreasing linearly to 50% relative
humidity at 40°C.
ALTITUDE:
Max 2,000m
TEMPERATURE CONTROL
Electronically controlled.
HEAT GENERATED
High fan setting:
1600 BTU/hr (average), 470 W (average)
Low fan setting:
1330 BTU/hr (average), 390 W (average)
OPERATING TEMPERATURES
Average temperatures at the end of the hose:
HIGH:
43° ± 1.5°C (109.4° ± 2.7°F)
MED:
38° ± 1.5°C (100.4° ± 2.7°F)
LOW:
32° ± 1.5°C (89.6° ± 2.7°F)
TIME TO REACH OPERATING TEMPERATURE
2 - 5 minutes (dependent on blanket model)
Time required for the contact surface temperature to heat up from 23 ± 2°C
to 37°C (73 ± 2°F to 99°F).
STORAGE/TRANSPORT TEMPERATURE
-20°C to 45°C (-4°F to 113°F)
Store all components in a cool, dry place when not in use.
SAFETY SYSTEM
THERMOSTAT
Independent electronic circuit; thermal cutoff shuts the heater
OFF to ensure hose end air remains below 46°C to 56°C; back-up
over-temperature detection at hose inlet.
ALARM SYSTEM
Over-temperature (46°C to 56°C): red
Over‑temp
indicator light flashes,
alarm sounds, heater and blower shut down, operating indicator lights
turn OFF, and the user can no longer adjust the warming unit using the
control panel.
FAULT:
Fault
indicator light flashes, alarm sounds.
OVERCURRENT PROTECTION
Dual input fused lines.
Electrical Characteristics
HEATING ELEMENT
1400 W Resistive
LEAKAGE CURRENT
Meets UL 60601-1 and IEC 60601-1 requirements.
BLOWER MOTOR
OPERATING SPEED:
4,700 rpm (high fan setting)
4,100 rpm (low fan setting)
AIRFLOW:
Up to 48 cfm or 23 L/s
POWER CONSUMPTION
Peak: 1550 W
Average: 800 W
POWER CORD
15 ft., SJT, 3 cond., 13 A
15 ft., SJT, 3 cond., 15 A
4.6 m, HAR, 3 cond., 10 A
DEVICE RATINGS
110-120 VAC, 50/60 Hz, 11.7 A, or
220-240 VAC, 50/60 Hz, 7.2 A, or
100 VAC, 50/60 Hz, 15 A
FUSES
TYPE:
Fast acting ceramic fuses, 250 VAC
AMP RATING:
12 A (110 - 120 VAC)
8 A (220 - 240 VAC)
15 A (100 VAC)
OPERATING SPEED:
F (Fast Acting)
BREAKING CAPACITY:
15 A, 12 A: 750 A @ 250 Vac
15 A, 12 A: 10,000 A @ 125 Vac
8 A: 200 A @ 250 Vac
8 A: 10,000 A @ 125 Vac
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