RBI Dominator Series Operations Instructions download pdf (Page 26)

DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONSPage 26

6. If the second ignition attempt is unsuccessful the

gas valves will lockout, but the blower, pump and

power venter will remain on. To reset the boiler/water

heater, take one of the following steps:

• Adjust the high limit down below the point at which

the blower shuts down, then reset the limit to its

normal setting.

• Remove power from the boiler/water heater, wait

30 seconds and re-establish power to the unit.

7. On CSD-1 applications the blower and power venter

will shut down and the boiler/water heater will lock

out. The unit must be manually reset.

Main Burner:

1. Once the pilot is proved the MV terminal on (FSM)

is energized sending 24V ac to the main gas valve.

2. The main gas valve opens via action of K1.

3. The main burner indicator light illuminates. The PV

terminal remains energized and the pilot indicator

remains on.

Normal Operation

• Staging will be controlled from the staging controller.

• The front control panel separately monitors limit, gas

pressure, water ﬂ ow and airﬂ ow.

• If staging changes during operation, the blower,

pressure switches and gas valves will be switched or

turned off as required.

• Stage 1 will operate ﬁ rst and last.

NOTE: For a change from stage 1 to 2, a 10 second

DOM time delay is provided in the pressure switch

switching circuit (TDR2). The time delay provides a

hold state that allows the blower to reach full speed

and close the high ﬁ re pressure switch before it is

energized to conﬁ rm proper air ﬂ ow.

Demand Satisﬁ ed:

1. Stage switch 1 opens, TDR1 de-energizes.

2. Power is removed from ignition module, blower and

power venter.

3. All indicator lights turn off except for the power

indicator light.

4. Staging controller initiates a pump purge for 20 or

more seconds, depending on the inlet/outlet

temperatures and ΔT setting in the controller. The

pump then shuts off.

Staging Control Alarms:

1. Staging control alarms are visible on the controller's

LCD screen. See the staging control documentation

for details.

2. A powered alarm contact (2A max @ 24 VAC) is

available to provide an audio or visual indication of

faults related only to the staging control's operation.

This contact is wired to the junction box for optional

remote indication. Refer to the 2 stage connection

diagram for tie-ins.

High Limit, Low Water Flow, Low Gas Pressure,

High Gas Pressure, Power Venter Interlock Faults

1. All gas valves, the blower and power venter will be

off if either alarm is tripped.

2. The manual reset high limit can be reset through a

knockout accessible in the left side jacket panel.

3. Condition indicators are visible on the control panel.

Low Air (Blocked Flue/Air Inlet)

• One of two pressure switches will monitor blower

airﬂ ow.

• Air monitoring will begin at prepurge. If a low air

condition is present, power will not be supplied to the

ignition module. The blower will remain on and the low

air indicator will remain on for as long as stage 1

remains energized.

• A low air indicator is visible on the control panel.

OPERATION SEQUENCE, 4 STAGE

D1050 THROUGH D2100

Note: Refer to the included connection and wiring

diagrams for further control system information.

POWER ON:

Demand for Heat:

1. BTC staging control starts pump and begins 50

second delay before energizing Stage 1.

2. Stage switch 1 closes.

3. System checks primary limit and other interlocks.

Will not start if either switch is open.

Prepurge:

1. TDR1 energizes starting a 40 second prepurge

cycle.

2. K4 energizes the low speed side of both blowers. If

the side-wall vent option is used the power venter

is energized, closing the power venter interlock. The

power vent indicator light illuminates.

3. The low air indicator lights will remain lit until the

blowers comes up to speed. The indicator lights will

turn off and prepurge indicator light will illuminate

when the pressure switches make.

4. At the end of the prepurge cycle TDR1 times out

and the TDR1 N.O. contacts close sending 24V ac

to the ignition control.

5. The prepurge indicator light shuts off.

6. K2 will switch the pilot valve, left main valve and

blower to high ﬁ re or low ﬁ re, depending on the

staging.

7. K3 will switch the right main valve and blower to high

ﬁ re or low ﬁ re, depending on the staging.

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RBI Dominator Series Operations Instructions Page 26

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