ELECTRICAL

6. ELECTRICAL

Install all electrical wiring in accordance with the National Electrical Code, ANSI/NFPA 70, and local requirements.

c)An example of this wiring using a Honeywell R845A relay is shown in Figure 6.2

NOTICE

This unit when installed must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the current edition of the National Electrical Code, ANSI/NFPA 70.

A.WIRING

1.Refer to Figures 6.1 for connecting the power supply to the boiler.

Figure 6.1: Wiring Connections to Boiler Junction Box

2.Connect boiler to a 110 volt, single phase, 60 hertz electrical supply line with a fused disconnect switch. The boiler is fused for a load of 6.3 amperes.

3.The boiler electrical connection is located on the left side of the boiler in the junction box which houses the service switch.

4.Wire the burner service switch in the hot line to the boiler as shown in Figure 6.1.

5.Make sure to maintain correct polarity on the incoming power supply wires. If polarity is reversed, the boiler control will not sense the main burner flame.

6.Connect the ground wire from the incoming power supply to the green ground screw in the junction box. Also, the boiler ground should be connected to this screw.

7.Figure 6.1 shows connections to system circulator.

a)The maximum current load for the circulator circuit is 4.0 amperes.

b)For loads greater than 4.0 amps, isolate the circulator using a switching relay.

Figure 6.2: Wiring Circulator with R845A Switching Relay

8.The thermostat connections are shown in Figure 6.1 or 6.2. The setting for the thermostat anticipator is

0.56amps.

9.The boiler control board and factory wiring are shown in figure 6.3.

B.SEQUENCE OF OPERATION

1.System Power-Up:

a) When power is first applied to the boiler, the control will initially run through a self-diagnostic routine. The interface unit shows the system supply temperature.

b) Next, it will power the combustion air fan for a 10 second purge cycle.

c) Finally the combustion air shuts down and if there is no call for heat the control board enters a standby mode.

2.Heating Cycle:

a) When the thermostat calls for heat (closing the contact between the two gray [TT] wires) and the boiler control senses a supply temperature lower than the set point by more than the differential, the boiler initiates a heating cycle.

b) The control then powers the combustion air fan at the speed prescribed for the particular boiler model and performs a 6 second pre-purge of the combustion chamber.

c) 0.5 second before the pre-purge is complete power is applied to the spark igniter.

d) Once the pre-purge cycle is complete, the fan speed decreases to the programmed ignition speed.

26

Page 28
Image 28
PB Heat Gas Boiler manual Electrical, Wiring, Sequence of Operation

Gas Boiler specifications

PB Heat Gas Boilers are renowned for their efficiency, reliability, and advanced technology, making them a popular choice for residential heating needs. With a range of models available, these boilers cater to various heating requirements while maintaining high performance and energy efficiency.

One of the standout features of PB Heat Gas Boilers is their exceptional efficiency ratings. Most models are designed to achieve AFUE (Annual Fuel Utilization Efficiency) ratings of over 90%, ensuring minimal energy waste and lower utility bills for homeowners. This high efficiency not only translates to cost savings but also contributes to a reduced carbon footprint, making PB Heat boilers a sustainable choice for environmentally conscious consumers.

PB Heat utilizes cutting-edge technologies to enhance the performance of their gas boilers. One such technology is the dual-stage gas valve, which allows for better modulation of gas flow, enabling the boiler to adapt to varying heating demands. This feature ensures consistent comfort while minimizing unnecessary energy consumption. Additionally, many PB Heat models come equipped with smart controls that can be easily integrated with home automation systems, giving homeowners the ability to monitor and adjust their heating remotely for maximum convenience and efficiency.

Durability and ease of maintenance are also key characteristics of PB Heat Gas Boilers. Constructed from high-quality materials, these boilers are designed to withstand the rigors of day-to-day operation. Features such as a corrosion-resistant heat exchanger contribute to the longevity of the unit, while easily accessible components simplify routine maintenance tasks, reducing downtime and service costs.

PB Heat Gas Boilers are available in various configurations, including wall-mounted and floor-standing models, catering to different space and installation requirements. This versatility allows homeowners to choose a solution that best fits their living environment while ensuring optimal heating performance.

In conclusion, PB Heat Gas Boilers represent a blend of advanced technology, energy efficiency, and robust construction. With their high efficiency ratings, smart control options, and durable design, these boilers provide reliable heating solutions for homes of all sizes. Choosing a PB Heat Gas Boiler means investing in a product that not only delivers comfort but also aligns with energy-saving and sustainability goals.