Submittal Sheet

Commercial Tankless

Rack System

For Technical Information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

TANKLESS COMMERCIAL RACK SYSTEMS

The Tankless Commercial Rack System model # __________ shall be factory assembled pre-plumbed system and includes A. O. Smith CT-199

Condensing Tankless Water Heaters. The Commercial Rack System shall include 2 inch copper water supply lines, 2 foot long ¾ inch ﬂexible

stainless steel water lines to the heaters, 1 ½ inch schedule 40 gas supply pipe with 3 foot long ¾ inch CSST ﬂexible gas lines to the heaters,

and isolation valves with 150 psi pressure relief valves for each heater. The rack shall be assembled as a wall mount design.

The fully modulating, on-demand, condensing gas ﬁred tankless water heater(s) shall be A. O. Smith Tankless Water Heater model CT-199,

having a maximum input rating of 199,000 Btu/h and available in NG or LP. The heater shall have ¾ in. male NPT water and gas connections.

The inlet gas supply pressures shall be 4.0 in. WC (min.) up to 10.5 in. WC (max.) for NG and 8.0 in. WC (min.) up to 14 in. WC (max.) for LP.

The indoor heater(s) shall incorporate an integrated temperature controller that will provide diagnostic information, fault history, and heater set

temperature. The outdoor heater(s) shall be factory supplied with a temperature remote, 9009069005, that can be installed up to 400 ft. from

the heater using 20 gauge (minimum) control wire. The temperature remote shall provide diagnostic information, fault history, and additional

temperature settings. The heater(s) shall operate using 120 V / 60 Hz power source. The indoor heater(s) will incorporate a factory installed

power cord.

The indoor heater(s) shall be vented with 3” or 4” diameter schedule 40 PVC, CPVC, ABS, or Category IV vent pipe with a length not to exceed

70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent, terminating horizontally or vertically. The intake pipe may use material such as

PVC, ABS, aluminum, or Category IV pipe and cannot exceed 70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent. The indoor heaters

shall be able to be common vented with schedule 40 PVC pipe with a length not exceed 100 ft. (equivalent) using up to10 inch pipe. Proper

sizing is provided in the heater’s installation manual. The outdoor heater(s) shall be constructed with an integral exhaust vent on the front of the

heater.

The water heater(s) shall use a commercial grade copper, ﬁn tube primary heat exchanger with quick release brass or bronze waterways. The

secondary heat exchanger shall be constructed from stainless steel 316L. The heater(s) shall be controlled by an onboard solid-state printed

circuit board which uses the following factory installed components: thermistors to monitor water temperature and exhaust temperature; a ﬂow

sensor to measure ﬂow rate; a ﬂame sensor to monitor combustion; an air-fuel ratio rod to measure and adjust air inputs in order to maintain

optimal combustion efﬁciency. The heater also consists of inline fusing and surge absorbers for electrical surge protection, an electronic spark

igniter, aluminized stainless steel burners, hi-limit temperature switches to monitor water and exhaust temperatures, modulating gas valve,

dual freeze protection that will automatically ﬁre the heater (indoor model only) and use heating blocks to protect the heat exchanger, and an

overheat cutoff fuse.

The heaters can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the onboard solid-

state printed circuit board and does not require external controls. The linking control wire shall be supplied with the heater. The heaters can use

a Multi-Unit controller, 9008300005, to manifold 5-20 heaters. The Easy-Link and Multi-Unit Controller shall modulate the system for the most

efﬁcient performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every 12 hours of operation time or 100 starts for

balanced duty/cycle operation.

The heater models are design certiﬁed by CSA according to ANSI Z21.10.3-2013, approved for sale in the United States, ENERGY STAR

qualiﬁed, has a minimum energy factor of 96%, meets the energy efﬁciency requirements of the U. S. Department of Energy and ASHRAE 90.1,

complies with SCAQMD Rule 1146.2 and other air quality districts with similar requirements for low NOx emissions of 14 ng/J or 20 ppm, and

shall be certiﬁed to NSF 5 Standards.

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AOSCG14002

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