740
Example Service Module: General Characteristics
This would give a reasonable latitude to the planning of functions
requiring special exhaust in service modules attached to this common
stack of service bays.
3. The plumbing risers are grouped at one end of the mechanical room,
with those services not required for this module valved and capped off
for future availability. Drainage pipes drop vertically through the stack
of service bays at their point of entry to the bay on either side of the
module.
4. The electrical room houses all the equipment for normal, emergency
and critical circuits. It is assumed in this module that critical distribution
is only required for the HVC equipment. The transformers to provide
the 277/120 volt service would be of the order of 75 KVA, and having
the capacity to serve more than one service module, would not appear
in every electrical room as shown here.
741.3.2
Main Distribution
The main distribution in the service zone at the S3 subzone level has been
laid out to allow the most direct connections to equipment and risers in the
service bay. The layout was also influenced by the constraints on
penetrations through the shear wall between the service bay and service
zone. The maintenance access is at either side of the module where
branch distribution runs would be least dense.
The HVC subsystem is assumed to be a single-duct terminal-reheat
system with a supply duct on each side of the central girder. The branch
connections to each supply duct would be as far as possible from the
same side of the duct to simplify the run of HVC plumbing to the terminal-
reheat units. The exhaust system is shown as ducted to illustrate how it
can be handled even though a plenum return could have been used. The
only special exhaust required for this module is the toilet exhaust.
741.3.3
Branch Distribution
Figure 740-3 shows the proposed locations of the branch distribution of
the services in each hanger space at the S2 and S4 subzone levels. In
practice, this organization would need detailed consideration to optimize
the locations and space assigned to each service to accommodate all
routing conditions.
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