Lochinvar 5 operation manual Sync How it works, Blowers

The SYNC - How it works...

1.Access cover - front

Provides access to the gas train and the heat exchanger.

2.Air intake adapter

Allows for the connection of the PVC air intake pipe to the boiler.

3.Air pressure switches

The air pressure switches detect blocked flue/vent conditions.

4.Air shrouds (1.0 Model only)

The air shrouds control air and gas flow into the burners.

5.Automatic air vents

Designed to remove trapped air from the heat exchanger coils.

6.Blowers

The blowers pull in air and gas through the venturis (item 35). Air and gas mix inside the blowers and are pushed into the burners, where they burn inside the combustion chamber.

7.Boiler drain port

Location from which the heat exchangers can be drained.

8.Boiler inlet temperature sensors

These sensors monitor system return water temperature. If selected as the controlling sensor, the control module adjusts the boiler firing rate so the inlet temperature matches the set point.

9.Boiler outlet temperature sensors

These sensors monitor boiler outlet water temperature. If selected as the controlling sensor, the control module adjusts boiler firing rate so the outlet temperature matches the set point.

10.Burners (not shown)

Made with metal fiber and stainless steel construction, the burners use pre-mixed air and gas and provide a wide range of firing rates.

11.Condensate drain connection

Connects the condensate drain line to a 1/2" PVC union.

12.Control modules

The control modules respond to internal and external signals and control the blowers, gas valves, and pumps to meet the heating demand.

13.Electronic display

Digital controls with touch screen technology and full color display.

14.Flame inspection windows

The quartz glass windows provide a view of the burner surfaces and flames.

15.Flame sensors

Used by the control module to detect the presence of burner flame.

16.Flap valves

Prevents recirculation of flue products when only one burner is running.

17.Flue gas sensors

These sensors monitor the flue gas exit temperature. The control modules will modulate and shut down the boiler if the flue gas temperature gets too hot. This protects the flue pipe from overheating.

18.Flue pipe adapter

Allows for the connection of the PVC vent pipe system to the boiler.

19.Gas connection pipe

Threaded 1½" pipe connection. This pipe should be connected to the incoming gas supply for the purpose of delivering gas to the boiler.

20.Gas shutoff valves (inside unit)

Manual valves used to isolate the gas valves from the burners.

21.Gas shutoff valve (outside unit)

Manual valve used to isolate the gas valve from the gas supply.

4

Installation & Operation Manual

22.Gas valves

The gas valves sense the negative pressure created by the blowers, allowing gas to flow only if the gas valves are powered and combustion air is flowing.

23.Heat exchanger access covers

Allows access to the combustion side of the heat exchanger coils.

24.High gas pressure switches

Switches provided to detect excessive gas pressure.

25.High limits

Devices used to monitor the outlet water temperature. If the temperature exceeds its setting, they will break the control circuit, shutting the boiler down.

26.Ignition electrodes

Provides direct spark for igniting the burners.

27.Line voltage junction box

The junction box contains the connection points for the line voltage power and all pumps.

28.Line voltage wiring connections (knockouts)

Conduit connection points for the high voltage junction box.

29.Low gas pressure switch

Switch provided to detect low gas pressure.

30.Low voltage connection board

The connection board is used to connect external low voltage devices.

31.Low voltage wiring connections (knockouts)

Conduit connection points for the low voltage connection board.

32.Low water cutoff device (LWCO)

Device used to ensure adequate water is supplied to the boiler and in the event of inadequate water levels, will ensure the boiler will shut down.

33.Power switch

Turns 120 VAC ON/OFF to the boiler.

34.Pump relay boards

The pump relay boards are used to connect the boiler, system and Hot Water Generator (HW) pumps.

35.Relief valve

Protects the heat exchangers from an over pressure condition. The relief valve will be set at 50 PSI.

36.Reset switch

Reset switch for the low water cutoff. Hold for 10 seconds to reset.

37.Stainless steel heat exchangers

Allows system water to flow through specially designed coils for maximum heat transfer, while providing protection against flue gas corrosion. The coils are encased in a jacket that contains the combustion process.

38.Temperature and pressure gauge

Monitors the outlet temperature of the boiler as well as the system water pressure.

39.Test switch

Test switch for the low water cutoff. Hold for 10 seconds to test.

40.Top panel

Removable panel to gain access to the internal components.

41.Venturis

The venturis control air and gas flow into the burners.

42.Water inlets

Two 2" NPT water connections that return water from the system to the heat exchangers.

43.Water outlets

A 3" NPT water connection that supplies hot water to the system.

44.O-temp switch (located underneath access cover)

An electrical switch designed to shut down boiler operation in the event the outer back of the heat exchanger, directly above the flue connection does not exceed 604°F (318°C). This is a one time switch and could warrant a heat exchanger replacement. Check the integrity of the rear refractory at the back of the upper coil if the switch opens.