S-Series Technical Manual 73 Cambridge Engineering, Inc.
Overview
Energy efficient, Genuine Cambridge
®
direct
gas-fired heating equipment can comply with the
requirements of ANSI/ASHRAE/IESNA Standard
90.1-2010. Compliance is shown on the Cambridge
heater nameplate.
Purpose of ASHRAE Standard 90.1
ASHRAE Standard 90.1 provides minimum require-
ments for the energy efficient design and construc-
tion of new commercial buildings in the United
States. The standard covers the entire building,
setting minimum equipment efficiency levels for
components that may be used, rather than setting
standards for component manufacturing. The provi-
sions of this standard do not apply to single family
houses, low rise residential buildings and buildings
(or portions of buildings) that use energy primarily
for industrial, manufacturing or commercial pro-
cesses.
Compliance Requirements:
The following are required for Cambridge heaters to
comply with Standard 90.1:
• Controls (Section 6.4.3)
Total airflow of all heaters less than 10,000 cfm
- The Cambridge TSS Controller will meet the
standard. A properly configured building DDC
system with the necessary programming for zone
control, automatic shutdown and setback can also
meet the standard.
Total airflow of all heaters exceeds 10,000 cfm
- The Cambridge TSS Controller with optimum
start control will meet the standard. A properly
configured building DDC system with the neces-
sary programming for zone control, automatic
shutdown, setback and optimum start can also
meet the standard.
Units intended to operate continuously - No spe-
cial controls are required to meet the standard.
• Damper (Section 6.4.3.4.3)
A damper is required on each heater. The
Cambridge Motorized Discharge Damper (MDD)
will meet the standard.
• Labeling (Section 6.4.1.5.1)
The heater must be labeled to indicate that it
complies with the requirements of the standard.
The nameplate of Cambridge heaters includes the
required labeling.
• Efficiency (Section 6.4.1.3)
Direct gas-fired heating equipment has no
minimum efficiency requirement. However
Cambridge certifies that its equipment has a
100% combustion efficiency (Ec) and a 92%
thermal efficiency (Et).
ANSI/ASHRAE/IESNA STANDARD 90.1
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