035-18265-001-A-0202

TROUBLESHOOTING

NOTE: Before troubleshooting, familiarize yourself with the startup and checkout procedure.

START

. Turn gas supply

off

. Set thermostat to

SV9501

is powered

(24 VAC nominal)

 

 

Check

 

 

. Line voltage power

 

 

. Low voltage

NO

 

transformer

 

. Main limit

 

 

 

 

 

 

(Auto reset)

 

 

. Rollout limit

 

 

(Manual reset)

 

 

. Auxilary limit

 

 

(Manual reset)

 

 

. Thermostat

 

 

. Wiring

 

 

. Air proving switch on

 

 

combustion air

 

 

blower system

 

 

. Vent damper (if used)

 

 

is open and end switch

 

 

made

 

 

 

INSET

HSI

TERMINALS

Igniter warms up

and glows red

Pilot valves opens

YES

Turn gas on.

Pilot burner lights?

YES

Main valve opens?

YES

System OK

 

 

 

 

 

Unplug pilot burner cable,

 

 

 

 

 

measure voltage at

 

 

 

 

 

 

NO

 

 

 

SV9501 HSI

 

 

 

 

 

terminals (24 VAC

 

 

 

 

 

 

 

 

 

 

nominal, see inset)

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

Replace igniter/flame rod as-

 

 

 

 

 

sembly

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

Replace SV9501

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measure voltage to SV9501.

 

 

 

 

 

 

NO

 

 

Voltage must be at least 19.5

 

 

 

 

 

VAC.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

Replace igniter/flame rod as-

 

 

 

 

 

sembly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace igniter/flame rod as-

 

 

 

 

 

sembly and retain.

 

 

 

 

 

Restart troubleshooting se-

 

NO

 

 

 

 

quence.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Does main valve open?

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

Discard old igniter/flame rod

 

 

 

 

 

assembly

 

 

 

 

 

 

NO

 

Replace

 

SV9501

 

 

 

 

 

Check

 

 

transformer

NO

 

 

line volt

 

 

supply

 

 

 

 

 

 

 

Replace

 

 

SV9501

 

 

save old

NO

 

igniter/

 

flame rod as-

 

 

 

 

 

 

sembly for

 

 

service

 

 

 

16

Unitary Products Group

Page 16
Image 16
York D2NA060, D1NA018 installation instructions Troubleshooting, Start, Inset HSI Terminals, Yes

D1NA018, D2NA060 specifications

The York D1NA018 and D2NA060 are advanced rooftop air conditioning units that combine efficiency, reliability, and innovative technologies to provide optimal climate control for commercial buildings. These units are designed to deliver robust performance while ensuring ease of installation and maintenance.

The D1NA018 is a compact model with a nominal cooling capacity of 1.5 tons, making it an ideal choice for smaller commercial spaces or applications where space is limited. In contrast, the D2NA060 offers a higher cooling capacity of 5 tons, catering to larger areas or environments that require more substantial cooling solutions. Both units are built with high-quality materials that enhance their durability and extend their operational life.

One of the key features of both models is their energy efficiency. They utilize advanced scroll compressor technology that ensures a quieter operation while optimizing energy consumption. The units are designed to achieve high Seasonal Energy Efficiency Ratios (SEER), which makes them compliant with modern energy regulations. This not only reduces operational costs but also minimizes the environmental impact.

Additionally, the York D1NA018 and D2NA060 come equipped with enhanced airflow technologies. They feature multi-speed blowers that can adapt to varying load conditions, ensuring consistent temperature control throughout the indoor space. The airflow systems are designed to provide even distribution, enhancing comfort for occupants.

These units are also equipped with user-friendly control options. The integrated digital controls allow for precise temperature management and programming, further increasing efficiency. Building managers can easily monitor and control the units, leading to improved operational convenience.

Another standout characteristic is their ease of installation. The compact design and lightweight construction of the D1NA018 simplify rooftop installations. The D2NA060, while larger, maintains a straightforward installation process, ensuring minimal disruption to building operations.

In terms of maintenance, the York D1NA018 and D2NA060 incorporate features that facilitate routine service and upkeep. Access panels are strategically placed, allowing technicians to reach components quickly and perform necessary maintenance checks with ease.

Overall, the York D1NA018 and D2NA060 represent a blend of efficiency, innovation, and practicality, making them suitable choices for a wide range of commercial applications. Their advanced technologies provide reliable climate control while reducing energy consumption, making them a preferred option for businesses seeking sustainable solutions.