BCBC CLIENT COMFORT SYSTEM (CCS) - DESIGN MANUAL

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INTRODUCTION

0.5   DETERMINING PRIMARY SYSTEM CONTROL TYPE

0.5.1  Selection of Primary Control System Type

BCBC uses DDC wherever economically feasible because experience has shown DDC is the only consistently successful route to comfortable conditions and effective operation.

Very few BCBC buildings have permanently staffed, on-site CCS operator stations. BCBC's operators primarily access CCSs by modem from their office or from laptop computers.

0.5.2  When BCBC Considers Alternatives to DDC

BCBC considers alternatives to DDC in the following circumstances.

• Very small properties such as store front offices
• Properties on short term lease

The reasons for these exclusions are:

• the threshold cost of a small DDC installation generates a high cost per occupant per annum when the property is very small and/or the occupancy is of short duration.
• the HVAC systems installed usually offer little opportunity for improvement through DDC.

0.5.3  Hard Wired Control Systems

BCBC uses hard wired control systems in three basic situations.

1. For very small projects if there is a significant cost premium to use a DDC system.
2. For non-critical elements on CCS projects if there is a significant cost premium to use the DDC. eg. A unit heater which would require a new or expanded DDC panel.
3. For critical safety interlocks.

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