Bradford-White Corp Comprehensive Guide to BJVS Residential Gas-Fired Hydronic Boilers

Brute Mini Hydronic Boiler Page 17

Figure 9a. Wiring Diagram, Spark Ignition System (BJVS 50 & 75).

5.When using a or field supplied power venter, the proving switch must be connected in series with the hi-limit.

6.Check the boiler wiring and pump for correct voltage, frequency and phase. If the pump circuit is other than 115V, be sure there is an appropriate transformer or relay installed. The pump relay is suitable for pumps of ¾ HP or less.

7.For systems with multiple zone pumps or valves, see Figure 10.

A means of disconnecting the electrical supply must be provided within sight of the boiler. The pump and boiler must be wired as shown to insure that the pump is running whenever the boiler is firing.

	110V								110V
	Hot								Neutral
			Zone		Space Heating
					Pump
			Pump	(Field Supplied)
			Relay
		1	3
			115V
			24V
Fuse
			Thermostat					Zone
		Boiler	Field			Boiler		Pump
Zone		Terminal	Supplied		Terminal			Relay
Pump	4	R				W		R
Relay
		Boiler	Optional		High
Zone		Terminal	Aquastat		Limit
Pump	6	A
Relay
						Vent
					Damper
					Receptacle
		Power			Ignition Control
		Venter				MV/			24V
Jumper		Receptacle
			24V		PV	PV	MV	GND GND
				6	3	2	1	4	5
		Blocked	Roll-Out
		Vent	Safety						SPARK
			Switch
		Safety
		Switch
					PV	MV/	MV
						PV

Gas Valve HW VR8304

Remote Flame Sensor High Altitude (Optional)

Figure 9b. Schematic, Spark Ignition System (BJVS 50 & 75).