Lennox Hearth LMDVT-3328-CNE, LMDVT-3328-CPM, LMDVT-3328-CNM SIT Millivolt, Honeywell Millivolt

Input (BTU) Manually-Modulated Gas Valves (millivolt models)

NATURAL GAS

Models	Input Rate (BTU / HR)
LMDVT-3328CNM	17,500 high
LMDVR-3328CNM	11,700 low
LMDV-3530CNM	20,000 high
	12,800 low
LMDV-4035CNM	27,000 high
	18,500 low
Table 1

Input (BTU) Manually-Modulated Gas Valves (millivolt models)

PROPANE GAS

Models	Input Rate (BTU / HR)
LMDVT-3328CPM	17,500 high
LMDVR-3328CPM	14,000 low
LMDV-3530CPM	20,000 high
	15,200 low
LMDV-4035CPM	27,000 high
	21,500 low

Table 2

Electronic Models -

Electronic models have a fixed rate gas valve. Input of electronic models is shown in Table 3.

Electronic Models with Fixed Rate Gas Valve

Natural and Propane Gas

Model Series	Input Rate
	(BTU / HR)
LMDVT-3328	17,500
LMDVR-3328
LMDV-3530	20,000
LMDV-4035	27,000

Table 3

Gas Pressure - All Models

Tables 4, 5 and 6 show the appliances' gas pressure requirements:

Inlet Gas Supply Pressure

(all models)

Fuel #	Minimum	Maximum
Natural Gas	5.0" WC	10.5" WC
	(1.24 kPa)	(2.61 kPa)
Propane	11.0" WC	13.0" WC
	(2.74 kPa)	(3.23 kPa)

Table 4

Manifold Gas Supply Pressure

(millivolt models)

Fuel #		Low	High
Natural	(Lo) 2.2" WC		(Hi) 3.5" WC
Gas		(.55 kPa)	(.87 kPa)
Propane	(Lo) 6.3" WC		(Hi) 10.0" WC
		(1.57 kPa)	(2.49 kPa)
Table 5
Manifold Gas Supply Pressure
	(electronic models)
Fuel #		Maximum Manifold Pressure
Natural Gas		(Hi) 3.5" WC (.87 kPa)
Propane		(Hi) 10.0" WC (2.49 kPa)
Table 6

Test gauge connections are provided on the front of the millivolt gas control valve, identi- fied IN for the inlet and OUT for the manifold side. A 1/8" NPT Test gauge connection is provided at the inlet and outlet side of the electronic gas control valve.

These appliances must be isolated from the gas supply piping system (by closing their individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

These appliances and their individual shut-off valves must be disconnected from the gas supply piping system during any pressure testing of that system at pressures greater than 1/2 psig (3.5 kPa).

Orifice Sizes - Sea Level to High Altitude (All Models)

These appliances are tested and approved for installation at elevations of 0-4500 feet (0-1372 meters)abovesealevelusingthestandardburner orifice sizes (marked with an "*" in Table 7). For elevations above 4500 feet, contact your gas supplier or qualified service technician .

Burner Orifice Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model	Nat.Gas	Propane
Series	drill size (inches)	drill size (inches)
LMDVT-3328	#45 (.082") *	(.048") *
LMDVR-3328	39L66 •	99K780 •
LMDV-3530	#44 (.086") *	#55 (.052") *
	60J8001 •	19L5201 •
LMDV-4035	#37 (.104") *	1/16" (.062")*
	24M1001 •	21L0101 •

Table 7	* Standard size installed at factory
	• Part /Cat. Number

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Install the appliance according to the regulations of the local authorities having jurisdiction and, in the USA, the National Fuel Gas Code NFPA 54

/ANSI Z223.1 - latest edition or, in Canada, the CAN1-B149.1 and .2 codes - latest edition.

Gas Valve Diagrams

See Figures 1 & 2 for Millivolt models and Figure 3 For Electronic Models.

SIT Millivolt			Gas Valve
HI/LO Variable			Inlet Pressure Tap
Flame Height
Adjustment	Manifold Pressure Tap
TPTH			OUT	IN
TP		IH	OFF
				P
				I
		LOW	it	L
TH				O
				T
			NO
P
I
TOL
Pilot Adjustment		Main Gas
Screw		Control Knob
		OFF/PILOT/ON
Figure 1

Honeywell Millivolt			Gas Valve
		PIEZO
PILOT		IGNITER	CONVERTIBLE
			HI/LO REGULATOR
ADJUSTMENT	GAS CONTROL
			(adjusts flame height
SCREW
	KNOB		and heat output)
TP/TH		O
		NI
			L
		P	O
TP			H
	L	I
	FFO TO
TH
WIRING	INLET		OUTLET
TERM-	PRESSURE		PRESSURE
INALS	TAP		TAP
Figure 2

Honeywell Electronic Gas Valve

Manifold Pressure		ON / OFF Switch
Port			Inlet
C			Pressure
ONTROL	OFF ON	N	Port
		I
IGNITER			Electronic
		ISP	Gas
			Control
			Valve

Figure 3