gized by a 120 VAC signal from S-1 on the ignition module for approximately 30 seconds. (The hot surface igniter must draw greater than 3.1 amps while being energized or ignition lockout will occur after three tries.)

43.Once the ignition module determines that the hot surface igniter has heated up and operating prop- erly, a 24 VAC signal is output from pin GV on the module.

44.24 VAC signal is received at gas valve 1 thus ener- gizing it.

45.The stage 1 LED on the status display board is now illuminated.

46.The coil of relay K-2 is now energized with the N.O. contacts closing downstream of the stage 2 and stage 3 connections.

47.The gas coming through the burners should ignite from the heat of the hot surface igniter and the flame should carry over from one burner to the other burners of stage 1. The remote sensor is now trying to sense the flame. If the flame is not sensed within 4 seconds, the ignition module will shut down gas valve 1 and retry the hot surface igniter. During ignition retry, the heater must per- form a 15-second pre-purge and an approximately 30-second igniter warm-up before opening gas valve 1 again. The standard ignition module will attempt ignition a maximum of three times prior to ignition lockout.

48.If the ignition module locks out, a signal will be sent to the Universal Diagnostics Board to indicate an ignition fault.

49.When power is sent to gas valve 1 it is also sent to time delay relay 1 (TD-1) which starts a 5-second countdown.

50.After the 5-second countdown from TD-1, 24 VAC is waiting at pin 3 of the stage 2 connections on the CPW board.

51.After closure of the stage 2 contacts Gas valve 2 is energized.

52.The stage 2 LED on the status display board is now illuminated.

53.Power is applied to pin 5 of the stage 3 connec- tions on the CPW board.

54.After closure of the stage 3 contacts, power is applied to TD-2.

55.After a 5 second countdown TD-2 contacts close.

56.Gas valve 3 then receives 24 VAC and is ener- gized.

57.The stage 3 LED on the status display board is now illuminated (end of sequence for 992B).

58.Power is applied to pin 7 of the stage 4 connec- tions on the CPW board.

59.After closure of the stage 4 contacts, power is applied to TD-3 (1262B only).

60.After a 5-second countdown TD-3 contacts close.

61.Gas valve 4 (solenoid valve located in the front air plenum) then receives 24 VAC and is energized.

62.The stage 4 LED on the status display board is now illuminated.

63.The heater is now operating at full fire.

Models 1532B – 1802B

1.The black (hot) wire lead goes directly to the main power switch. This black toggle switch is located at the middle front of the control compartment.

2.When the main power switch is placed in the “ON” position, 120 VAC is applied to the 120 VAC termi- nal block on the circuit board and the 120/24 VAC transformer is powered.

3.120 VAC is waiting at the N.O. contacts of the Economaster II pump delay.

4.Terminals L1 and F1 of the ignition module are powered with 120VAC.

5.120 VAC power is also applied to the control power connector on the circuit board.

6.120 VAC power is waiting at the N.O. contacts of K-3 relay to energize the heater blowers.

7.The 120/24 VAC transformer outputs 24 VAC.

8.24 VAC is sent to pin L1 of the low water cut-off (optional) and the red power light is energized.

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Raypak 992B manual Models 1532B 1802B
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992B specifications

The Raypak 992B is a highly regarded commercial boiler known for its efficiency and reliability in heating applications. Designed for a range of installations, it is particularly favored in schools, hotels, and various commercial settings where dependable heating is crucial. One of the standout features of the Raypak 992B is its impressive thermal efficiency rating, often exceeding 90%. This efficiency translates into lower energy costs and reduced environmental impact, making it a smart choice for eco-conscious businesses.

The Raypak 992B comes equipped with advanced technologies that enhance performance and ease of use. Among these technologies is the high-precision digital control system, which allows for accurate temperature regulation and monitoring. This feature ensures optimal performance and minimizes energy waste, further contributing to the unit's cost-effectiveness. The boiler also utilizes a modulating burner system, enabling it to adjust flame size based on real-time heating demands. This adaptability not only enhances efficiency but also improves overall comfort within a facility.

Another significant characteristic of the Raypak 992B is its robust construction. Built with durable materials designed to withstand demanding operating conditions, this boiler is engineered for long-lasting performance. Its compact design is an added benefit, facilitating installation in areas with limited space. The unit is also equipped with a stainless steel heat exchanger, which provides superior resistance to corrosion and enhances heat transfer efficiency.

Safety features are also paramount in the design of the Raypak 992B. The boiler includes multiple safety controls and alarms to prevent overheating and maintain safe operating conditions. This diligence in safety ensures peace of mind for operators and reduces the risk of unexpected downtime.

In summary, the Raypak 992B stands out as a top choice for commercial heating solutions, combining high efficiency, advanced technology, and rugged construction. Its features cater to a wide range of heating needs while prioritizing safety and economy. With its impressive performance capabilities, the Raypak 992B continues to be a reliable partner for facilities seeking optimal heating solutions.
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