Lennox Hearth LMDVR-3328-CPM Millivolt Appliances SIT Systems, SIT Millivolt Gas Valve

IMPORTANT

LE CANADA SEULEMENT

La conversion devra être effectuée conformément aux recommanda- tions des autorités provinciales ayant juridiction et conformément aux exigences du code d'installation CAN1-B149.1 ET.2.

Gas conversion kits are available to adapt the appliance from the use of one type of gas to the use of another. These kits contain all the necessary components needed to complete the task including labeling that must be affixed to ensure safe operation.

Kit part numbers are listed here and the following steps detail the conversion procedure.

Step 1. Turn off the gas supply to the appliance. Remove the front glass door/frame from the appliance. Access the control compartment.

Step 2. Carefully remove the logs. Exercise care so as not to break the logs.

Step 3. Locate the screws securing the burner assembly to the appliance. Remove the burner assembly and retain the securing screws.

Step 4. Millivolt Appliances - SIT Systems

a. See Figure 62 and the instructions provided with the kit. Using a Torx T20, tool or or standard flat screwdriver remove and discard the three pressure regulator mounting screws. Remove the pressure regulator, spring, poppet, diaphragm and bushing. Discard all removed components. Ensure the rubber gasket installed on the back of the replacement pressure regulator is properly positioned and install the new pressure regulator using the new screws supplied with the kit. Tighten screws to 25 In. lb. torque.

SIT Millivolt Gas Valve

Pressure

Regulator

Remove

These

Components

Figure 62

Pilot for

SIT Millivolt

Gas Valve

Pilot

Orifice

Figure 63

b. Attach manometer to the manifold side pressure test fitting and verify manifold pressure reads 3.5 inches water column (0.87 kPa) for natural gas, and 10.0 inches water column (2.49 kPa) for propane gas.

c. Refer to Figure 63 and remove the pilot hood assembly to access the hexed pilot orifice. Remove and replace the orifice with the one provided with the kit.

Step 5. Millivolt Appliances

Honeywell Systems -

a. Convert the gas valve as follows

(see Figure 64 ): Remove the plastic protect- ing cap. Remove the gas type setting screw by turning it counterclockwise. Obtain the replacement gas type setting screw from the kit and screw it into place (red for propane and blue for natural gas). Tighten the gas type setting screw by turning it clockwise. Replace the plastic protecting cap.

Honeywell Millivolt Gas Valve

Adjusting Knob

Regulator Cap

Conversion screw

(blue natural gas;

red LP/propane gas)

Figure 64

b. Attach manometer to the manifold side pressure test fitting and verify manifold pressure reads 3.5 inches water column (0.87 kPa) for natural gas, and 10.0 inches water column (2.49 kPa) for pro- pane gas.

c. Convert the pilot orifice as follows (see Figures 65 & 66 ):

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Note - Use extra care not to engage the orifice strip with the 7/16" open end wrench (contacting the orifice strip could cause strip distortion rendering the pilot inoperative). Also avoid wrench contact to any of the other pilot parts.

Use a 7/16" open end wrench and turn the pilot hex fitting counter-clockwise 1/4 turn. (See Figure 66).

Note - The orifice strip tab may be randomly located on any side of the hex fitting.

d.Push the orifice strip tab all the way against the hex fitting to align the appropri- ate gas type orifice (see Figures 65 & 66). The type of gas for which the pilot is set, is, the gas type shown on the tab.

e.Retighten, clockwise, the pilot hex fitting until the pilot hood aligns with the thermocouple and thermopile as indicated by the arrows shown in Figure 66.

Pilot for Honeywell Millivolt Gas Valve

Orifice Strip Tab Position Identification

For LP (propane gas) and Natural Gas

P	L			LP (propane) Gas Posi-
				tion - 1/16 inch hole,
				LP and red color shown
				on tab.
				Natural Gas Position
		NA	T	- NAT shown on tab.

Top View of Hex Fiting and Orifice Strip Tab

Figure 65

Pilot for Honeywell Millivolt Gas Valve

(Loosening of Hex Fitting For

Orifice Strip Tab Positioning)

Hood	Hood
	Alignment

7/16 in. Open End Wrench

Orifice

Strip Tab

Take care not to contact the orifice strip tab with the hex fitting wrench - distortion of the tab may render the pilot inoperative.

Figure 66

35