271015-UUM-A-0407

ON

W2 SIGNAL

 

OFF

HIGH INDUCER

ON

 

 

 

 

 

 

HIGH STAGE PRESSURE

OFF

 

 

 

ON

SWITCH AND 2ND STAGE

 

 

 

MAIN VALVE

OFF

CIRCULATOR HIGH

ON

 

 

 

HEAT SPEED

OFF

 

 

CALL HIGH HEAT AFTER LOW

2ND STAGE

HEAT IS ESTABLISHED

 

 

 

HIGH

HEAT

OFF DELAY 30 SEC.

 

CLOSED

 

 

 

 

 

 

 

 

 

 

HIGH LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPEN

 

 

 

 

 

 

 

 

 

 

W1 SIGNAL

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

LOW

ON

 

 

 

 

 

 

 

 

 

 

INDUCER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

LOW STAGE

CLOSED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRESSURE

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH

OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HSI

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

1ST STAGE

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAIN VALVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FLAME

PRESENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SENSE

ABSENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW CIRCULATOR

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT SPEED

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HSI

 

INTER-

HSI

HEAT FAN

 

BURN

 

 

 

 

WARM

 

PURGE

WARM

DELAY ON

 

TIME

 

 

 

 

UP

 

60 SEC.

UP

30 SEC.

 

 

 

 

 

LOW PRESSURE

17 SEC.

 

 

 

27 SEC.

 

 

 

 

 

1ST STAGE

 

 

 

 

 

 

 

 

 

 

SWITCH CLOSE

 

 

 

 

 

 

 

 

 

POST

 

RECOGNITION

 

 

IGNITION

 

 

 

 

 

PURGE

 

 

 

 

 

 

 

 

 

 

 

15 SEC.

 

 

 

 

 

 

DEACTIVATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IGNITION

 

PERIOD

 

 

 

 

 

 

 

 

3 SEC.

 

 

 

 

 

HEAT FAN DELAY OFF

 

ACTIVATION

 

 

 

 

 

 

 

TRIAL FOR

 

 

 

 

 

 

PERIOD

IGNITION

SELECTABLE

60,90,120,180 SEC.

4 SEC.

7 SEC.

 

 

 

NOTE:

1.THIS DIAGRAM SHOWS TWO IGNITION ATTEMPTS

2.TIMING LENGTHS ARE NOT TO SCALE

FIGURE 7: Furnace Control Event Schedule

Unitary Products Group

9

Page 9
Image 9
York LL8V*DH, PV8*DH, FC8V*DH, FL8V*DH, LC8V*DH service manual Furnace Control Event Schedule

LL8V*DH, LC8V*DH, FL8V*DH, FC8V*DH, PV8*DH specifications

The York FL8V*DH, LC8V*DH, PV8*DH, LL8V*DH, and FC8V*DH series represent a range of advanced heating and cooling solutions tailored to meet the needs of both residential and commercial applications. These units are engineered with cutting-edge technologies that enhance energy efficiency, performance, and user comfort, making them a top choice for HVAC needs.

One of the standout features of these systems is their high-efficiency design, which often exceeds industry standards. The FL8V*DH, for example, boasts an impressive SEER (Seasonal Energy Efficiency Ratio) rating, allowing users to save on energy costs while ensuring optimal heating and cooling comfort. The innovative design minimizes energy consumption without compromising performance, which is critical in today’s eco-conscious market.

Another hallmark of these series is their use of advanced refrigerant technology. Utilizing environmentally friendly refrigerants, such as R-410A, these units deliver excellent heat transfer while reducing the overall carbon footprint. This focus on sustainability ensures that customers can feel good about their choice, contributing positively to the environment.

The technology behind these models extends to their variable-speed blower motors, which provide precise airflow and temperature control. This flexibility allows adjustments based on real-time demand, enhancing comfort and reducing energy usage. The use of smart thermostats with these systems enables users to program schedules, monitor usage, and optimize settings remotely, further improving efficiency.

In terms of durability and reliability, the York series is built from high-quality materials designed to withstand the test of time. Robust construction minimizes maintenance needs, resulting in lower long-term ownership costs. Additionally, many units feature quiet operation technologies, ensuring minimal noise disturbance, which is particularly important in residential settings.

Moreover, installation and servicing of the York FL8V*DH, LC8V*DH, PV8*DH, LL8V*DH, and FC8V*DH systems are made simpler through their user-friendly designs. Easy access points for maintenance staff help to reduce downtime and enhance system longevity.

Overall, the York FL8V*DH, LC8V*DH, PV8*DH, LL8V*DH, and FC8V*DH units stand out due to their efficiency, innovative technology, durability, and user-friendly design, marking them as exceptional choices in the HVAC market. These systems not only provide comfort but also align with energy-saving initiatives, making them a wise investment for the future.