Chapter 2 Mechanical Installation 19
DataMate 3000 Series Air Conditioner User Manual
6. Use a marking pen to draw a line lengthwise from the coupling union nut to the
bulkhead. Tighten the nuts an additional quarter turn with two wrenches. The
misalignment of the lines shows how much the coupling has been tightened. The
final quarter turn is necessary to ensure that the joint does not leak. Two wrenches
must be used to cooperate each other during connection, because one wrench can
damage the coupling copper lines easily.
If a torque wrench is used, the torque values in Table 2-4 are recommended:
Table 2-4 Recommended torque value for quick connect fittings
Coupling size
kgf/cm
2
#6 0.7~0.8
#10 #11
2.5~3.2
2.7 Checklist For Mechanical Installation
1. Proper clearances for service access have been maintained around the system.
2. Equipment is vertical and mounting fasteners are tight.
3. Piping is completed to refrigerant loop. The valves of the quick connects have
been fully opened.
4. Condensate pump is installed (if required).
5. Drain line is connected.
6. Water supply line is connected to humidifier (if required).
7. All piping connections are tight.
8. Foreign materials have been removed from in and around all system installed
(shipping materials, construction materials, tools, and so on)
9. Fans and blowers rotate freely without unusual noise.
After the inspection, read the next chapter to make electrical connections.
