Amazon V
Part 3 - S
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2.1.3 Master and slave unitpositioning
In systems withmultipleoutdoor units, the units should be placed in order from largest capacity unit to smallest capacity
unit. The largest capacity unit must be placed on the first branch, and be set as the master unit, while the others should be
set as slave units. Refer to the V6Service Manual, Part 4 for details of how to set units as master/slave.
The example in Figure 3-2.4 illustrates the placing of units in a 48HP combination:
▪ Place the 22HP unit on the first branch and set it as the master unit.
▪ Place the 16HP and 10HP units on the next branches and set them as slave units.
Figure 3-2.4: Positioning of master and slave units
Outdoor units
(48HP)
A (22HP)
B (16HP)
C (10HP)
Indoor
unit A
Indoor
unit B
Indoor
unit C
First outdoor
branch joint
2.1.4 Base structures
Outdoor unit base structure design should take account of the following considerations:
▪
A solid base
prevents excess vibration and noise.
Outdoor unit bases should be constructedon solid ground or on
structures of sufficient strength to support the units’ weight.
▪ Bases should be at least 200mm high to provide sufficientaccess for installation of piping.
▪
Either steel or concrete bases may be suitable.
▪ A typical concrete base design is shown in Figure 3-2.5. A typical concrete specification is 1 part cement, 2 parts sand
and 4 parts crushed stone with Φ10mm steel reinforcing bar. The edges of the base should be chamfered.
▪ To ensure that all contact points are equally secure, bases should be completely level.Base design should ensure that
the pointson the units’ bases designed for weight-bearing support are fully supported.Bolt spacings should be as per
Figure 3-2.6 and Table 3-2.1.
▪ A drainage ditch should be provided to allow drainage of condensate that may form on the heat exchangers when the
units are running in heating mode. The drainage should ensure that condensate is directed away from roadways and
footpaths, especially in locations where the climate is such that condensate may freeze.
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