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monitor, gas controller, economizer, thermostat,
DDC control options, and low and high pressure
switches. Controller shall also provide an intuitive
means to adjust the indoor fan speed through a sim-
ple switch and pot adjustment design.
4. The heat exchanger shall be controlled by an inte-
grated gas controller (IGC) microprocessor. See
heat exchanger section of this specification.
5. Unit shall include a minimum of one 8-pin screw
terminal connection board for connection of con-
trol wiring.
B. (23 09 33.13.B.) Safeties:
1. Compressor over-temperature, over-current. High
internal pressure differential.
2. Low pressure switch:
a. Low pressure switch shall use different color
wire than the high pressure switch. The purpose
is to assist the installer and service technician to
correctly wire and or troubleshoot the rooftop
unit.
3. High pressure switch:.
a. High pressure switch shall use different color
wire than the low pressure switch. The purpose
is to assist the installer and service technician to
correctly wire and or troubleshoot the rooftop
unit.
4. Automatic reset, motor thermal overload protector.
5. Heating section shall be provided with the follow-
ing minimum protections:
a. High temperature limit switches.
b. Induced draft motor speed sensor.
c. Flame rollout switch.
d. Flame proving controls.
Part 6 — (23 09 93) Sequence of Operations for HVAC
Controls
6.01 (23 09 93.13) Decentralized, Rooftop Units:
A. (23 09 93.13.A.) INSERT SEQUENCE OF
OPERATION
Part 7 — (23 40 13) Panel Air Filters
7.01 (23 40 13.13) Decentralized, Rooftop Units:
A. (23 40 13.13.A.) Standard filter section:
1. Shall consist of factory installed, low velocity, dis-
posable 2-in. thick fiberglass filters of commer-
cially available sizes.
2. Unit shall use only one filter size. Multiple sizes
are not acceptable.
3. Filters shall be accessible through an access panel
with “no-tool” removal as described in the unit cabi-
net section of this specification (23 81 19.13.G).
Part 8 — (23 81 19) Self-Contained Air Conditioners
8.01 (23 81 19.13) Small-Capacity Self-Contained Air
Conditioners:
A. (23 81 19.13.A.) General:
1. Outdoor, rooftop mounted, electrically controlled,
heating and cooling unit utilizing a fully hermetic
scroll compressor(s) for cooling duty and gas com-
bustion for heating duty.
2. Factory assembled, single-piece heating and cool-
ing rooftop unit. Contained within the unit enclo-
sure shall be all factory wiring, piping, controls,
and special features required prior to field start-up.
3. Unit shall use Puron
®
(R-410A) refrigerant.
4. Unit shall be installed in accordance with the man-
ufacturer’s instructions.
5. Unit must be selected and installed in compliance
with local, state, and federal codes.
B. (23 81 19.13.B.) Quality Assurance:
1. Unit meets ASHRAE 90.1 minimum efficiency
requirements.
2. Unit shall be rated in accordance with AHRI Stan-
dards 210/240 (04-06 sizes) or 340/360 (07 size).
3. Unit shall be designed to conform to ASHRAE 15.
4. Unit shall be UL-tested and certified in accordance
with ANSI Z21.47 Standards and UL-listed and
certified under Canadian standards as a total pack-
age for safety requirements.
5. Insulation and adhesive shall meet NFPA 90A
requirements for flame spread and smoke
generation.
6. Unit casing shall be capable of withstanding
500 hour salt spray exposure per ASTM B117
(scribed specimen).
7. Unit shall be designed in accordance with ISO
9001, and shall be manufactured in a facility regis-
tered by ISO 9001:2015.
8. Roof curb shall be designed to conform to NRCA
Standards.
9. Unit shall be subjected to a completely automated
run test on the assembly line. The data for each unit
will be stored at the factory, and must be available
upon request.
10. Unit shall be designed in accordance with UL Stan-
dard 1995, including tested to withstand rain.
11. Unit shall be constructed to prevent intrusion of
snow and tested to prevent snow intrusion into the
control box up to 40 mph.
12. Unit shake tested to assurance level 1, ASTM
D4169 to ensure shipping reliability.
C. (23 81 19.13.C.) Delivery, Storage, and Handling:
1. Unit shall be stored and handled per manufac-
turer’s recommendations.
2. Lifted by crane requires either shipping top panel
or spreader bars.
Guide specifications (cont)
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