Unvented Gas Log Heater or Vented Decorative Appliance Models: PH18 (for use with PH18-R Log Sets), PH24 (for use with PH24-R or PH30-R Log Sets) WARNINGS If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. Installation and Operating 652035 PH logs cover Instructions – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
CONTENTS PH Gas Logs Thank you and congratulations on your purchase of an MHSC Log Set. PLEASE READ THE INSTALLATION AND OPERATION INSTRUCTIONS BEFORE USING THE APPLIANCE! IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instructions may result in a possible fire hazard and will void the warranty. Carbon Monoxide Warning......................................... 2 Important Safety Information..................................... 3 Codes..........
IMPORTANT SAFETY INFORMATION INSTALLER WARNING Please leave these instructions with the appliance. PH Gas Logs OWNER Please retain these instructions for future reference. • Any change to this heater or its controls can be dangerous. • Improper installation or use of the heater can cause serious injury or death from fire, burns, explosion or carbon monoxide poisoning. • Do not allow fans to blow directly into the fireplace. Avoid any drafts that alter burner flame patterns.
IMPORTANT SAFETY INFORMATION as they are burned off during the initial operation of the appliance; possibly causing headaches or eye or lung irritation. This is a normal and temporary occurrence. The initial break-in operation should last two to three hours with the burner at the highest setting. Provide maximum ventilation by opening windows or doors to allow odors to dissipate. Any odors remaining after this initial break-in period will be slight and will disappear with continued use. 20.
PRODUCT FEATURES PH Gas Logs Gas Specifications Model Fuel Control PH18NM Nat. Manual PH18NV Nat. Millivolt PH24NM Nat. Manual PH24NV Nat. Millivolt PH18PM LP Manual PH18PV LP Millivolt PH24PM LP Manual PH24PV LP Millivolt Min.Input Max. Input BTU/h BTU/h 18,000 30,000 26,000 30,000 19,000 36,000 24,000 36,000 22,500 30,000 24,500 30,000 25,000 36,000 29,000 36,000 GAS pressures Manual Regulator Pressure Millivolt Regulator Pressure Millivolt Pilot Regulator Max. Gas Inlet Pressure Min.
GETTING STARTED PH Gas Logs the burner only. Do not pick the unit up by the burners or grate (not attached to frame). • Gloves are recommended when handling ceramic fiber logs to prevent skin irritation from loose fibers. Logs are fragile — handle with care. Make sure you have received all parts: Check your packing list to verify that all listed parts have been received.
WARNING FIREPLACE and HEARTH DIMENSIONS PH Gas Logs This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fireplace, vent free appliance, or in listed ventless firebox enclosure. It has been design certified for these installations. Exception: DO NOT install this appliance in a factory-built fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs.
CLEARANCES and HEIGHT REQUIREMENTS WARNING PH Gas Logs The dimensions shown in Figures 3 through 11 and defined in the fireplace manufacturer's instructions are minimum clearances to maintain when installing this heater. Left and right clearances are determined when facing the front of the heater. When heater is installed into a ventless firebox, minimum clearances, as specified by the ventless firebox manufacturer, must be met. Follow these instructions carefully to ensure safe installation.
INSTALLATION REQUIREMENTS 8" or More of Heat Resistant Material Hood PH Gas Logs Heat Resistant Material 12" 10" 8" 6" 256O" 8" Heater in Fireplace or Figrebox Hood Heater in Fireplace or Firebox FP2923 Figure 5 Measure Heat Resistant Material for Mantel Heat resistant material (minimum requirements) with FP2923 wooden mantel or other combustible projection: resist matl w mantel To install theheat heater with a wooden mantel, shelf or other combustible projection above, first measure the heat res
FLOOR CLEARANCE PH Gas Logs The gas log heater must be installed at least 5" above any combustible flooring material, such as carpeting or tile, which is closer than 14" to the base of the fireplace. The minimum distance must be maintained from the top surface of carpeting, tile, etc. Figure 8 OR, The gas log heater may be installed nearer to the floor if a minimum of 14" of noncombustible material such as slate or marble is installed between the base of the fireplace and the combustible flooring.
INSTALLATION Before fully installing the unit: • Turn OFF the gas supply to the fireplace or fire- WARNING • box. Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper. PH Gas Logs Damper stop installation: A damper stop must be provided with the unit. Contact your dealer to obtain one.
INSTALLATION PH Gas Logs CONNECT THE GAS LINE 1. Center the gas log unit in the fireplace or firebox. 2. Install Grate: Insert longest middle grate bar in one of the two square holes in control panel. Figure 11. Be sure grate is centered. Sit horizontal bar inside two hooks on front of control panel. Figure 11. Make certain front feet of grate are located inside front edge of fireplace or firebox. 3. Anchor holes are located on the flange of the unit. Figure 11.
INSTALLATION PH Gas Logs CHECK GAS PRESSURE Millivolt Control The heater gas inlet connection is a 3/8" NPT at the valve. All units have the inlet connection on the right side, when you face the unit. To connect from the opposite side, route the pipe under the rear portion of the unit. Figure 14 When tightening up the joint to the valve, hold the valve securely to prevent movement.
ELECTRICAL WIRING - MILLIVOLT WARNING PH Gas Logs Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
ELECTRICAL WIRING - MILLIVOLT PH Gas Logs Connect optional Remote Receiver Follow instructions supplied with the remote. Connect the wires to the two .25" male connectors located on the left side of the valve when facing the unit (Refer to Page 17, Figure 15). Do not let wire touch grate or burner. NOTE: Heat reduces battery life. You can protect the receiver and extend battery life by mounting the receiver in a wall or other location outside the fireplace.
LOG PLACEMENT WARNING PH Gas Logs The positioning of the logs are critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance. Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. Only use the logs supplied with the unit.
LOG PLACEMENT PH Gas Logs 4. Place Front Log (#4) in between burner and grate so that notched areas fit between grate supports. Figure 18 Figure 18 LG1086 Front Log #4 Left Top Log #5 Right Top Log #6 5. Rest Left Top Log (#5) LG1086 on front and rear log cutouts. Figure 19 PH18 log 6. Rest Right Top Log (#6) on front and rear log cutouts.
LOG PLACEMENT WARNING PH Gas Logs The positioning of the logs are critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance. Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. Only use the logs supplied with the unit.
LOG PLACEMENT PH Gas Logs 4. P l a c e F r o n t L o g ( # 4 ) i n between burner and grate so that notched areas fit between grate supports. Figure 22 Figure 22 LG1090 Front Log #4 Left Top Log #5 Right Top Log #6 LG1090 PH24 log 4 5. Rest Left Top Log (#5) on front and rear log cutouts. Figure 23 6. Rest Right Top Log (#6) on front and rear log cutouts.
LOG PLACEMENT WARNING PH Gas Logs The positioning of the logs are critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance. Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. Only use the logs supplied with the unit.
LOG PLACEMENT PH Gas Logs 4. Place Front Log (#4) in between burner and grate so that notched areas fit between grate supports. Figure 26 LG1094 Figure 26 Front Log #4 Left Top Log #5 Right Top Log #6 LG1094 PH30 log 4 5. Rest Left Top Log (#5) on front and rear log cutouts. Figure 27 6. Rest Right Top Log (#6) on front and rear log cutouts. Figure 27 Figure 27 CAUTION LG1095 DO NOT sprinkle volcanic rock on the logs or around the pilot or the main burner. This LG1095 may cause sooting.
FLAME APPEARANCE PH Gas Logs Flames from the pilot, front and rear burner should be visually checked as soon as the heater is installed. In addition, periodically check the flames visually during operation. Check the pilot flame The pilot flame must always be present when the heater is in operation. It should just touch the top of the thermocouple tip for natural. Refer to Figures 28 and 30 for correct pilot flame appearance.
FLAME APPEARANCE PH Gas Logs In normal operation at full rate after 15 minutes, the following flame appearances should be observed: LG1099 Figure 32 Correct Burner Flame Appearance The left and right flames should be yellow and extend 1" to 2" above the log top surfaces. The yellow flames should not contact the logs.
PH Gas Logs CHECKING THE BURNER FLAME OPERATING INSTRUCTIONS Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into the fireplace. Do not place a blower inside the burn area of the firebox. Ceiling fans may create drafts that alter flame patterns. Sooting and improper burning will result. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or bonding agents.
OPERATING INSTRUCTIONS PH Gas Logs WARNING FOR YOUR SAFETY, READ BEFORE LIGHTING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the unit by hand. B. BEFORE OPERATING smell all around the appliance area for gas.
OPERATING INSTRUCTIONS PH Gas Logs MANUAL control lighting instructions WARNING 1. STOP! Read the safety information. 2. Make sure the manual shutoff valve is fully open. 3. This heater is equipped with an ignition device (piezo) which automatically Rotate lights the pilot. 4. Refer to Page 25 for the location of the piezo ignitor and control knob. Push in gas control knob slightly and turn control knob clockwise to the OFF position. NOTE: Knob cannot be turned to OFF unless knob is pushed in slightly.
OPERATING INSTRUCTIONS PH Gas Logs Millivolt control lighting instructions 1. STOP! Read the safety information label. 2. Make sure the manual shutoff valve is fully open. 3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo ignitor does not light the pilot, refer to instructions for Match Lighting Instructions, Page 28. 4. Turn gas control knob clockwise to the OFF position, set thermostat to lowest setting and turn ON/OFF switch to OFF position.
OPERATING INSTRUCTIONS and CLEANING & SERVICING PH Gas Logs MATCH lighting instructions WARNING 1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo button, light a match and hold the flame to the end of the pilot and ignite the pilot. 3. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access. 4.
WARNING TROUBLESHOOTING PH Gas Logs Turn off appliance and allow to cool before cleaning. Only a qualified service person should service and repair the heater. Problem When ignitor button is pressed, there is not spark at ODS/pilot. Appliance produces unwanted odors. Appliance shuts off during use. NOTE: All troubleshooting items are listed in order of operation. Possible Cause 1. Ignitor electrode positioned wrong. 2. Ignitor electrode is broken. 3. Ignitor electrode not connected to ignitor cable.
TROUBLESHOOTING PH Gas Logs Problem Possible Cause ODS/pilot lights, but flame goes out when control knob is released. Logs appear to smoke after initial operation. 1. Control knob not fully pressed in. 2. Control knob not pressed in long enough. 3. Manual shutoff valve not fully open. 4. Thermocouple connection loose at control valve. 5. Pilot flame not touching thermocouple, which allows thermocouple to cool, causing pilot flame to go out.
REPLACEMENT PARTS PH Gas Logs 1 4 3 7 - Millivolt 5 2 7 - Manual 8 11 6 9 WARNING 10 652035 PH parts Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury.
PH Gas Logs Ref. Description Qty. PH18NM/NV PH18PM/PV 1. Burner 1 65D1053 65D1054 2. Piezo Ignitor 1 14D0503 14D0503 5. Piezo Wire 1 00K0632 00K0632 Pilot Tube (not shown) 1 49D0050 49D0050 Manual Control 3. Injector 1 56D0613 20H3144 4. ODS Pilot Assy 1 26D2529 14D0476 6. Knob Control 1 18D0603 18D0603 7. Control Valve 1 30D0201 30D0202 8.
REPLACEMENT PARTS PH Gas Logs PH24-R PH18-R 6 1 5 5 3 1 6 3 2 2 4 4 PH30-R 5 1 6 3 2 4 Ref. 1. 2. 3. 4. 5. 6. Description Rear Log #1 Left Middle Log #2 Right Middle Log #3 Front Log #4 Left Top Log #5 Right Top Log #6 65D2035 Qty.
PH Gas Logs Massachusetts Residents Only — Please read and follow these special requirements NOTE REGARDING VENTED PRODUCTS This product must be installed by a licensed plumber or gas fitter when installed within the Commonwealth of Massachusetts. Any residence with a direct vent product must have a CO detector installed in the residence. Installation of the fireplace or vented gas log in the State of Massachusetts requires the damper to be permanently removed or welded in the fully open position.
LIMITED LIFETIME WARRANTY PH Gas Logs Lifetime Warranty The following components are warranted for life to the original owner, subject of proof of purchase: Firebox, Combustion Chamber, Heat Exchanger, Grate, and Stainless Steel Burners. Five Year Warranty The following components are warranted for 5 years to the original owner, subject of proof of purchase: Vent Free Ceramic Fiber Logs and Aluminized Burners.
MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.
