Torque Specifications - Bolts; Torque Specifications - Split System Electrical Panels; Drive Belt Installation; Belt Clearance - Carrier Transport Air Conditioning Installation Procedures Manual

6.2.1 Torque Specifications - Bolts

Always torque to the specifications noted on each
mount kit installation instructions. The torque values
listed in Figure 6-2 and Figure 6-3 are based on the use
of lubricated threads.
Torque
(Ft-Lb
Bolt Size
Dia. mm Cast Iron
Grade 8.8
6 7
7 10
8 18
10 30
12 55
14 85
16 130

Figure 6-1 Metric Torque Specs

Commercial Grade Head Markings
Metric Bolts
8.8
Grade 8.8 Grade 10.9

Figure 6-2 Metric Bolt Markings

Torque
Bolt Size (Ft-Lb)
Dia. mm Cast Iron
Grade 2
1/4-20 5
5/16-18 10
3/8-16 18
7/16-14 30
7/16-20 32
1/2-13 45
1/2-20 50
5/8-11 82
5/8-18 93

Figure 6-3 U.S.S. Torque Specs

Commercial Grade Head Markings
U.S. Customary Bolts
Grade 5
Grade 2

Figure 6-4 U.S.S. Bolt Markings

T--311
Torque Torque
(Ft-Lb (Ft-Lb
Cast Iron Cast Iron
Grade 10.9 Grade 12.9
9 9
13 18
23 27
45 50
75 95
120 145
175 210
10.9
12.9
Grade 12.9
Torque Torque
(Ft-Lb (Ft-Lb
Cast Iron Cast Iron
Grade 5 Grade 8
7 11
15 22
30 40
45 65
50 70
70 95
75 110
135 190
155 215
Grade 8
6.2.2 Torque Specifications - Split System ELectri-
cal Panels
a. Circuit Breaker (Plastic) - 24 Inch-Pounds - max
Breaker Mounting Screws - 15 Inch-Pounds
b. Terminal Strip (Plastic) - 25 Inch Pounds - max
Terminal Strip Mounting Screws - 25 Inch Pounds

6.3 DRIVE BELT INSTALLATION

6.3.1 Introduction
There are several factors that have major effects on
compressor and alternator drive belt(s) life expectancy
and reliability. Belt alignment and proper tension being
the most critical and controllable by the installer and
end-user. Improper alignment and/or tension will cause
premature failure of drive belts, driven components as
well as a possible safety issue. When improperly
installed and/or maintained, drive belts can cause
significant damage to equipment as well as service
personnel. This document will act as a guideline for
proper installation instruction as well as continuous
maintenance guidelines which when followed insures
years of trouble free service. The following are the
biggest factors that effect belt life and system
dependability.
A. Belt Alignment
B. Belt Tension
1. Over Tensioned
2. Under Tensioned
C. Belt Clearance
D. Temperature-Heat
E. Fluids
F. Maintenance Procedures
This document acts as a guide only. This document will
not replace proper
experience required for Carrier A/C Certification. As
always, take special caution when working with running
engines and drive belts. Safety glasses or goggles must
be worn at all times. Loose clothing is also extremely
dangerous around moving pulleys and belts.
For questions or concerns not covered here, please feel
free to contact the Carrier Transport Air Conditioning
Technical Service Hot Line (1--800-450-2211).

6.3.2 Belt Clearance

A certain belt clearance needs to be provided for belt
span vibration when installing compressors and
alternator belts. Figure 6-5 shows the recommended
clearance guidelines for preliminary layout work. Due to
the large number of variables, actual testing is required
to determine whether the clearances are acceptable.
6--2
installation training and/or
Change 07/09