MCC EM-1 - Torque Specifications - Refrigerant Fittings; Torque Specifications - Bolts; Electrical Control Panel - Torque Values

4-- 11© 2012 Mobile Climate Control T-299 Rev. 08/2012
Table 4-6 STANDARD TORQUE REQUIREMENTS
SIZE TUBE O.D. * FLARE
O-RING
THREAD **
STEEL TUBING ALUM. TUBING
4 1/4 inch (.250) 11-13 ft./lbs. 30-35 ft./lbs. 5-7 ft./lbs. 7/16
5 3/8 inch (.375) 15-17 ft./lbs. 30-35 ft./lbs. 8-10 ft./lbs 9/16
6 3/8 inch (.375) 18-20 ft./lbs. 30-35 ft./lbs. 11-13 ft./lbs 5/8
8 1/2 inch (.500) 36-39 ft./lbs. 30-35 ft./lbs. 15-20 ft./lbs 3/4
10 5/8 inch (.625) 52-57 ft./lbs. 30-35 ft./lbs. 21-27 ft./lbs 7/8
12 3/4 inch (.750) 71-79 ft./lbs. 30-35 ft./lbs. 28-33 ft./lbs 1-1/16
* The tube O.D. is measured at the point it passes through the nut. ** Thread pitch may vary.
4.10 TORQUE SPECIFICATIONS - REFRIGERANT
FITTINGS
All refrigerant hose fitting connections must be
torqued to the specifications listed in Table 4-6.
NOTE
No matter what typ e of lubricant (oil) usedin
the system, always use mineral oil to lubricate
the O-Rings and fittings. PAG oils will
absorb moisture and become very acidic and
corrosive. Mineral oil absorbs moisture at a
much lower rate than PAG oils.
4.11 TORQUE SPECIFICATIONS - BOLTS
The torque values listed in Table 4-7 and Table 4-8
are are based on the use of lubricated threads.
Table 4-7 Metric Torque Specs
Bolt Size
Dia. mm
Torque
(Ft-Lb
Cast Iron
Grade 8.8
Torque
(Ft-Lb
Cast Iron
Grade 10.9
Torque
(Ft-Lb
Cast Iron
Grade 12.9
6
7
8
10
12
14
16
7
10
18
30
55
85
130
9
13
23
45
75
120
175
9
18
27
50
95
145
210
8.8 10.9
12.9
Commercial Grade Head Markings
Metric Bolts
Grade 8.8 Grade 10.9
Grade 12.9
Figure 4-3 Metric Bolt Markings
Table 4-8 U.S. Torque Specs
Bolt Size
Dia. mm
Torque
(Ft-Lb)
Cast Iron
Grade 2
Torque
(Ft-Lb
Cast Iron
Grade 5
Torque
(Ft-Lb
Cast Iron
Grade 8
1/4-20
5/16-18
3/8-16
7/16-14
7/16-20
1/2-13
1/2-20
5/8-11
5/8-18
5
10
18
30
32
45
50
82
93
7
15
30
45
50
70
75
135
155
11
22
40
65
70
95
110
190
215
Commercial Grade Head Markings
U.S. Customary Bolts
Grade 5
Grade 8
Grade 2
Figure 4-4 U.S. Bolt Markings
4.11.1 Electrical Control Panel - Torque Values
Torque values for all Split-System electrical panels
are as follows.
1. Torque value for wire connections at the plastic
circuit breakers are: 24 In-Lbs max.
2. Plastic Breaker mounting screw torque is:15
In-Lbs.
3. Torque value for wire connections at the plastic
terminal strip are: 25 In-Lbs max.
4. Terminal Strip m ounting screws are: 25 In-Lbs
max.