Country Flame INGLS 24-N, INGLS 24-P TROUBLE-SHOOTINGGUIDE, vent-free, Millivolt, vent-free, Millivolt, WIRE SIZE, WIRE SIZE, VALVE TYPE, SAFETY MAGNET, Millivolt Plus, Millivolt Plus

TROUBLE-SHOOTING GUIDE

The 820 Nova millivolt control Millvolt Plus vented, or the (2)

valve is available in three different configurations. They are the (1) Millivolt Plus vent-free, or the (3) Millivolt systems.

The Millivolt Plus vented system is for use in direct vent appliances that require fast shut-off in the even of a pilot flame failure. A thermocouple powers the safety magnet and a thermopile powers the main control valve.

The Millivolt Plus vent-freesystem is used in conjunction with an ODS pilot. As with the vented Millivolt Plus control valve, this valve uses a thermocouple to power the safety magnet and uses a thermopile to power the main control valve.

The Millivolt system is used with gravity vented appliances where rapid shut-off is not necessary in the event of a pilot flame outage. It uses a single thermopile to power both the safety magnet circuit and the main control valve. A spill switch could be used in the safety magnet circuit of this system.

All NOVA control valves are fitted with a safety interlock device that prevents unsafe ignition of the pilot burner after the ON/PILOT/OFF control knob is turned to the OFF position. All three of these control valves can accommodate a wall switch, or a wall thermostat, or a remote control unit that can be used to cycle the main control valve on and off. Following is the electrical data for the 820 Nova millivolt gas control valve models:

VALVE TYPE	MAIN CONTROL VALVE		SAFETY MAGNET
NOVA mV Plus	Minimum Voltage	145 mV	Hold-in current	Less than 285mA
Vented	Coil Resistance	2.25Ω±0.5Ω	Drop-out current	Greater than 125mA
			Coil resistance	0.018Ω±0.003Ω
NOVA mV Plus	Minimum Voltage	145 mV	Hold-in current	Less than 200mA
Un-vented	Coil Resistance	2.25Ω±0.5Ω	Drop-out current	Greater than 80mA
			Coil resistance	0.018Ω±0.003Ω
NOVA Millivolt	Minimum Voltage	145 mV	Hold-in current	Less than 12mA
Vented	Coil Resistance	2.25Ω±0.5Ω	Drop-out current	Greater than 4mA
			Coil resistance	10.2Ω±0.05Ω

All millivolt control valve circuits are easily affected by electrical resistance. If enough resistance is present in the appliances circuit, two things can occur. (A) Either the main control valve will work intermittently and be unpredictable or (B) the main control valve will not work at all. There are several areas where excess resistance can be found in the appliances circuit. In new installations, the thermostat itself can be found to be the problem. Always use a thermostat rated for millivolt control as they have been designed to minimize circuit resistance. The other area to check is the wiring itself. Wire gage plays an important part in wire resistance. The smaller the diameter of the wire and the greater the length of the wire, the larger the circuit resistance will be. The table above provides valuable information to select the proper wire that is used to connect to the main control valve. This table refers to the total length of wire from the control valve out to the thermostat and back to the control valve. All electrical connections must be tight, clean, and free from corrosion. Corrosion can build up over time due to humidity problems so inspect wire connections on an annual basis.

WIRE SIZE	MAXIMUM LENGTH	WIRE SIZE	MAXIMUM LENGTH
12 Gauge	150 feet	18 Gauge	40 feet
14 Gauge	100 feet	20 Gauge	25 feet
16 Gauge	64 feet	22 Gauge	16 feet

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