d.If the furnace is cold, check for 24 volts at wire 241 attached to the time delay relay (ETD) located in the main control box. If 24 volts is not found, replace the ETD relay.

e.If 24 volts is found at wire 241, remove the wires attached to the (ETD) and with a VOM, check for continuity across contacts 1 and 2. If none is found, the (ETD) is open and must be replaced. If there is continuity, re-attach the wires.With the draft motor running, check for 24 volts at terminal 4 of (RW1-2) and (RW2-1). If 24 volts is not present, the centrifu- gal switch (CS) has not closed or has gone bad. Check the line voltage to the unit - if it is correct, replace the draft motor. If line voltage is low, call the power company.

f.Check for 24V at terminal 2 of (RW1-2 and RW2-1). If 24V is not present, check for 24V at (RW1 and RW2) relay coils. If these relays are pulled in, then check for a loose connection at terminal 2 and termi- nal 4 of each relay. If no problem is found, then replace (RW1 and/or RW2) as required.

g.If 24 volts is present at the ignitor controls, check all control wiring at the ignitor controls and the high ten- sion wire to the ignitors. Check that the ground wires from the ignitor controls, the gas valves and pilot burners are all intact and making good electrical connection. Check to make sure that the ceramic insulator on the pilot ignitors or sensors is not bro- ken or cracked, if all are intact, replace the ignition control IC1 or IC2.

5.The draft motor runs and the sparker sparks at the pilot burner but the pilot does not ignite and a gas odor is not detected at the draft motor outlet.

a.Check to make sure gas is being supplied to the unit. Make sure that the gas pressure to the unit is within the proper limits as described in the POST START CHECK LIST and that the pilot adjust screw is allowing some flow of gas as described in PILOT CHECKOUT.

b.Check all wiring between the ignitor control and the gas valve. Check to make sure the ground connec- tions are intact.

c.If the wiring is intact, check for 24 volts across termi- nals PV and COMMON on the ignitor control. If 24 volts is not present, replace the ignitor control.

d.If 24 volts is present, remove the pilot burner and remove the pilot orifice from the pilot burner. The ori- fice is removed in the direction opposite the flow of gas. Inspect the orifice for obstruction. If it is clear, replace the main gas valve.

6.The sparker sparks at the pilot burner but the pilot does not ignite and a gas odor is detected at the draft motor outlet.

a.Adjust the pilot adjust screw on the gas valve as described in PILOT CHECKOUT.

b.Check the supply pressure as described in POST START CHECK LIST. Make adjustments as neces- sary.

c.Check the pilot orifice for obstruction as described in para. 5d. Clean as needed but the problem should not be the gas valve.

7.The pilot burner ignites but the sparker continues to spark and the main burners do not ignite.

a.Make the same checks and adjustment as described in para. 6.

b.Make sure that the pilot burner is not bent or dam- aged.

c.Make sure that the ground connections at the pilot burner, gas valve and ignitor control are intact. Check the high tension wire for good electrical con- nection. If all are intact, replace the ignitor module.

8.The pilot burner lights and the spark stops but the main burners do not light.

a.Check electrical connections between the ignitor control and the gas valve. If intact, check for 24 volts across terminals MV and COMMON terminals. If no voltage detected, replace ignitor control. If voltage is present, replace gas valve.

9.Furnace lights with roll-out or one burner has delayed ignition.

a.Make sure that the pilot burner is aligned properly with the carryover as described in PILOT CHECK- OUT.

b.Make sure that the carry overs on adjoining burners are screwed fast and are level with respect to one another.

10.Main burners light but exhibit erratic flame characteris- tics.

a.Adjust air shutters as described in BURNER AIR SHUTTER ADJUSTMENT.

b.Check the main burner orifices for obstruction and alignment. Removal procedure is described in BURNER INSTRUCTIONS. Clean or replace burner orifices and burners as needed.

Subject to change without notice. Printed in U.S.A.

 

 

 

Copyright © by Unitary Products 2002. All rights reserved.

Supersedes: 035-17233-000 Rev B (0500)

035-17233-000-C-0702

 

 

 

 

 

 

 

Unitary

5005

Norman

 

Products

York

OK

Group

Drive

73069

 

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Energy Tech Laboratories DHG240, DHG180 installation instructions Unitary
Page 27 Page 28

DHG180, DHG240 specifications

Energy Tech Laboratories has made significant strides in the realm of energy efficiency and renewable technologies with the introduction of their innovative models, the DHG240 and DHG180. These advanced devices are designed to optimize energy consumption, minimize environmental impact, and enhance overall energy management.

The DHG240 model stands out with its high-capacity performance, delivering a robust output of 240 kW. This unit is ideal for large facilities and industrial applications, where energy demands are high. One of its main features is its advanced algorithm for energy distribution, which allows for optimal load balancing across various operational units. This ensures that energy is used efficiently, reducing waste and lowering operational costs.

Similarly, the DHG180 is designed for medium-sized operations, providing an output of 180 kW. It offers an effective solution for businesses seeking to improve energy efficiency without the excessive overhead costs typically associated with larger systems. The DHG180 incorporates state-of-the-art monitoring systems that provide real-time data on energy consumption, allowing operators to make informed decisions and adjust settings as needed.

Both models integrate cutting-edge technologies such as smart grid capabilities and renewable energy sources. They are equipped to handle integration with solar panels and wind turbines, enabling facilities to harness clean energy and reduce reliance on fossil fuels. This feature not only contributes to sustainability goals but also provides a buffer against fluctuating energy prices.

The design of both the DHG240 and DHG180 prioritizes durability and reliability. They are constructed from high-quality materials that withstand harsh operational conditions, ensuring a long lifespan and reduced maintenance costs. Furthermore, these systems are compliant with various energy efficiency standards, making them a responsible choice for environmentally conscious businesses.

User-friendliness is another hallmark of these devices. An intuitive interface allows operators to easily monitor and control energy usage, while remote access compatibility enables management from off-site locations. This flexibility is crucial in today’s fast-paced business environment.

In conclusion, Energy Tech Laboratories’ DHG240 and DHG180 models represent the forefront of energy technology. By delivering high performance, integrating renewable solutions, and prioritizing ease of use, these units empower businesses to achieve their energy efficiency goals while promoting sustainability. Whether for large industries or medium-sized enterprises, these systems are engineered to meet the dynamic needs of modern energy management.
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