Controlled Power

Proven draft control for gas and solid fuel

Set once, right for the application-specific chimney. The installer dials in draft inducer speed at commissioning, so it runs only as hard, and only as loud, as that chimney needs. The end user gets simple on and off from a wall switch, a remote, or a home automation contact.

WBC
WBC-DUO
GBC
GBC-DUO

Size a system Documents and drawings

Proves draft: Before the appliance runs
Gas: Interlocked with the gas control
Alarm: Audible and visual, built in
Wiring: Factory-wired, Molex
Power: Plugs into a 120V outlet

How it works

A fan speed control is not a draft control.

A speed control sets how fast a fan spins. It cannot tell whether the chimney is actually drafting, and it cannot stop the appliance when it is not. Code requires both, and every X-VENTISO controller does both.

01
Commission once
The installer sets draft inducer speed for that specific chimney.
02
Call
A wall switch, remote, or automation contact turns the system on.
03
Prove draft
Gas: pressure-proven with the stack probe and tubing in the box. Solid fuel and grease: proven by draft inducer operation.
04
Run or alarm
Gas: the burner can fire only with draft proven. Solid fuel and grease: audible and visual alarm if draft fails.

Install photo coming soon: controller and MUC mounted at the appliance

Quiet

Set to the chimney, not to full speed.

A draft inducer with no speed control runs flat out. With Controlled Power, the installer sets draft inducer speed on the MUC at commissioning to what that specific chimney needs. Most installs are commissioned at 38 V, where XV Series draft inducers tested 23 to 34 dB below full speed.

The rest of the system carries it the rest of the way. The draft inducer discharges 45° upward, away from the building. The vibration dampener keeps motor vibration at the top of the chimney. On gas installs, the WSPRDraft flue silencer absorbs the noise that travels down the flue.

Need it quieter still? Meridian modulates continuously and slows down whenever conditions allow.

Tested sound data MeridianSound and Silencing

Models

Choose by fuel and flue count.

Solid fuel and grease
WBC
Proves draft by draft inducer operation, with no sensor in the stack to foul in grease or creosote. Built-in audible and visual alarm, as NFPA 211 requires on solid fuel. Pairs with the automatic solid fuel damper.
Solid fuel and grease, two flues
WBC-DUO
Two draft inducers on two flues from one controller, with the same features as WBC.
Gas
GBC
Proves draft before the burner can fire. Stack probe and tubing in the box. For full BAS integration on gas, specify Meridian.
Gas, two flues
GBC-DUO
Two draft inducers on two flues from one controller, with the same features as GBC.

One appliance, up to four flues: XV-MULTICTRL (sold separately) links two controllers of the same fuel type to one MUC. A DUO plus a single covers three flues; two DUOs cover four. Unusual layout? Call 800.642.2920 →

DUO

Two flues. One controller. Acting as one.

Large single-face fireplaces, see-through, double-sided, and custom multi-sided units, and ovens and commercial appliances with two flues. A second flue usually means a second draft inducer, a second control, and two systems the installer has to make agree.

WBC-DUO and GBC-DUO run both draft inducers from one controller, as one system.

One controller
One MUC
One controller and one MUC instead of two. Half the hardware at the appliance.
One speed
Set once for both
Commissioned once at the MUC. Both draft inducers run together at the same speed.
One call
Start together
One wall switch, remote, or automation contact starts both flues at the same moment.
One system
Alarm and interlock
WBC-DUO: one audible and visual alarm. GBC-DUO: one gas interlock. One system to wire and inspect.

If either flue faults, the whole system knows. The MUC alarms. On gas, the appliance is shut off. On solid fuel, it stays in alarm until the fault is resolved.

Need each flue controlled on its own? Meridian DUO modulates each flue independently, each referenced to the room. Three or four flues: two controllers on one MUC through XV-MULTICTRL.

In the box

Code compliance shouldn't be an upgrade.

Included	WBC	GBC	Meridian	GFDC	SFDC
Plugs into a standard 120V outlet	Included	Included	Included	Included	Included
Factory-wired, plug-in Molex connections	Included	Included	Included	Included	Included
Proves draft or damper open	Included	Included	Included	Included	Included
Stack probe and pressure tubing	Not included	Included	Included	Not included	Not included
Gas interlock (NFPA 54)	Not included	Included	Included	Included	Not included
Audible and visual alarm (NFPA 211)	Included	Included	Visual, on display	Not included	Included
Service disconnect at draft inducer	Included	Included	Included	Not included	Not included
Smoke alarm (solid fuel)	By building	Not included	Not included	Not included	By building

GFDC and SFDC are the gas and solid fuel damper controls. DUO versions carry the same features as their base controller. NFPA 211 requires the audible and visual alarm on solid fuel; GBC carries it as well. Requirement-by-requirement detail on the Code Compliance page.

The MUC

One controller. Speed and alarms built in.

Every Controlled Power package includes the MUC, the Multi Use Controller. Run and alarm lights show status at a glance, the speed slider is set once at commissioning, and the audible alarm sounds if draft fails. A service mute lets a technician silence the sound while working on the system. The alarm light stays on until the fault clears, and the mute resets on the next power cycle.

The same MUC runs both GBC and WBC, so installers learn one control for gas and solid fuel. It plugs into the controller, and turns the system on from any low-voltage contact closure: a wall switch, a remote, or an automation relay.

Connection	Molex	Goes to
Controller	6-pin	GBC or WBC; two controllers through XV-MULTICTRL
On / off	4-pin, black lead	Wall switch, remote, or automation relay
Gas interlock (GBC)	4-pin, black lead	Appliance gas control

The MUC (Multi Use Controller) with run and alarm lights, speed slider, and service mute button.

Automation

If it can close a contact, it can run the system.

Every Controlled Power controller turns on and off from a simple low-voltage contact: a wall switch, a hearth remote, a home automation relay, or a building automation output.

Draft inducer speed is set at commissioning and stays with the controller, so no switch, app, or BAS can change it.

Need full BAS integration with status and readings on gas? Specify Meridian →

Controller	Native BACnet / Modbus	Automation can
WBC · WBC-DUO	Custom, by request	On and off by dry contact
GBC · GBC-DUO	No	On and off by dry contact

Specifications