User manual FIELD CONTROLS 46115000

[. . . ] The thermostat (wall thermostat or aquastat) calls for heat and energizes a relay which activates the power venter. After the venter motor has come up to speed, the pressure switch closes. For millivolt controlled water heaters using the CK-20 Series Control Kit, the gas valve pressure switch activates the power venter at the same time as the burner fires. After the heating requirement has been satisfied, the thermostat circuit will open and de-activate the burner and power venter circuit. [. . . ] With an input over 50, 000 BTU's per hour, a 12" termination clearance shall be required. The vent termination point shall not be installed closer than 3' from an inside corner of an L-shaped structure. The vent termination should not be mounted directly above, or within 3' horizontally from an oil tank vent or gas meter. The bottom of the vent terminal shall be located at least 12" above finished grade. Page 4 Diagram A 3. After determining the location of the venting system termination point (see Diagram A), cut a square hole through the wall 1" larger than the outer pipe diameter of the power venter. Mount the power venter through the wall, keeping the outer pipe centered in the hole. (See Figure 3) Fasten the power venter to the outside wall with appropriate fasteners. Seal the edges of the power venter base plate to the wall with a high temperature silicone sealant. Wood or vinyl siding should be cut so that the unit mounts directly on the wall board to provide a stable support. If the siding is greater than 1/2" thick use a spacer plate or board behind the power venter mounting plate. (See Figure 2) NOTE: If mounting the power venter though a combustible wall material and the flue gas temperature is above 400°F at the power venter inlet, line the square hole with a piece of corrosion resistant sheet metal or non-combustible material. Loosen the locking screw on the air flow adjustment damper on the outer pipe of the power venter. Follow appliance manufacturer's procedures for starting the heating appliance. After the system has operated for several minutes to stabilize flue gas temperatures, check for negative draft or up-draft at the heating appliance outlet or air flow into the draft hood. Adjust the adjustment damper closed to obtain the minimum air flow required to maintain draft. Then increase air flow slightly (10% over minimum air flow rate) to ensure proper venting. For oil-fired or gas-fired power burners, adjust draft to proper over-fired draft. Figure 8 If proper draft has been established, tighten the adjustment locking screw. For gas-fired systems, shut off thermostat and check for residual heat spilling from draft hood. If so, use a Field Controls PPC-5 Electronic Post Purge or a Control Kit which includes one. Before installing, refer to the General Installation Inspection to check for negative pressure problems in the building. If sufficient combustion air for the burner is not provided, a flow reversal during the off cycle could occur within the venting system. This may cause combustion problems as well as condensation that could block the air pressure sensing tube. [. . . ] Check the barometric draft control, if installed, to insure the gate swings freely. System Safety Devices: With the heating system operating, disconnect the pressure sensing tube from the pressure switch on the CK Kit. For 30 millivolt operating systems, disconnect one lead of the spill switch circuit from the thermocouple junction block. Re-connection will allow relighting the pilot. Page 8 REPLACEMENT PARTS Should the motor or blower wheel need replacing, the following replacement items are available. [. . . ]