Monessen Hearth VDY24/18 User manual

INSTALLATION AND OPERATING INSTRUCTIONS
Shown with
Log Set
VDY24/18D2
MODELS: VDY24/18 • VDY30
Natural Gas or Propane/LPG Control Type: Manual or Milli-Volt
This gas log set is to be installed only
in a solid-fuel burning fireplace with a
working flue constructed of noncom-
bustible material.
READ AND SAVE THESE INSTRUCTIONS
Approved to ANSI Z21.60
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.
– Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the
fire department.
– Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
Shown with
Log Set
VDY30D3R
Shown with
Log Set
VDY24/18D4

2 32D1999
Important Safety Information ........................ 3
Getting Started ............................................... 4
Product Specifications ................................... 5
Product/Features Specifications ................... 6
Placement in a Fireplace with a Restrictive
Barrier ........................................................ 7
Installation ....................................................... 8
Connecting the Gas ......................................... 9
Electrical Wiring (Millivolt) .............................11
Log Placement .............................................. 12
Fireplace Draft Test ...................................... 16
Flame Appearance ........................................ 17
TABLE OF CONTENTS
Operating Instructions ................................. 18
For Your Safety Read Before Lighting ...... 18
Manual Control Lighting Instructions ......... 18
Milli-Volt Control Lighting Instructions ....... 19
Safety Instructions for Manual Control without
Pilot ........................................................... 20
Optional Remote Receiver ........................... 21
Cleaning and Servicing ................................ 22
Illustrated Parts List ..................................... 23
Troubleshooting ........................................... 27
Warranty ..........................................Back Cover

32D1999 3
1. The installation, combustion and ventilation air must
conform with local codes or, in the absence of local codes,
with the National Fuel Gas Code, ANSI Z223.1.
2. This unit complies with ANS Z21.60-1996 • CGA 2.26-
M96 Decorative Gas Appliance for Installation in Solid-
Fuel Burning Fireplace. The natural gas manual control
unit without the pilot complies with IAS U.S. 7-94. Man-
ually Lighted, Natural Gas Decorative Gas Appliance for
Installation in Solid-Fuel Burning Fireplaces.
3. Installation and repair should be done by a qualified ser-
vice person. Monessen Vented Gas Logs must be installed
only in a solid-fuel (wood) burning fireplace which can
only be constructed of non-combustible material, with
minimum venting requirements, see installation sec-
tion.
4. To prevent malfunction, gas log set and flue should be
cleaned at least annually by a professional service person.
More frequent cleaning may be required due to excessive
lint from carpeting, etc. It is imperative that control com-
partments, burners and circulating air passageways be
kept clean.
5. Correct installation of the ceramic fiber logs, and annual
cleaning are necessary to minimize problems with soot-
ing. See log placement instructions for proper instal-
lation.
6. A damper clamp must be installed to provide the minimum
permanent vent opening to vent flue products, Refer to
installation instructions.
7. Never burn solid fuels in a fireplace where a gas log set
is installed.
8. This appliance must not be used with glass
doors in the closed position. Provisions for adequate
combustion air must be provided, adequate combustion
air usually results in all flames curling into the fireplace
away from screen and up the flue.
INSTALLER
Please leave these instructions with the owner.
OWNER
Please retain these instructions for future reference .
IMPORTANT
Read these instructions carefully before installing or trying to operate this gas log set.
IMPORTANT SAFETY INFORMATION
9. Keep room area clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
10. Children and adults should be alerted to the hazard of
high surface temperature and should stay away to avoid
burns or clothing ignition.
11. Young children should be carefully supervised when they
are in the same room with the gas log set in operation.
12. Do not place clothing or other flammable material near
the fireplace when the gas logs are in use.
13. Do not use this gas log set if any part has been underwater.
Immediately call a qualified service technician to inspect
the gas logs and replace any part of the control system
and any gas control which has been under water.
14. The gas log set and its individual shutoff valve must be
disconnected from the gas supply piping system during
any pressure testing of the gas supply piping system at
test pressures in excess of 1/2 psig (3.5kPa).
15. The gas log set must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply pip-
ing system at test pressures equal to or less than 1/2 psig
(3.5kPa).
16. FOR MASSACHUSETTS RESIDENTS ONLY:
Installation of this vented gas log in the Commonwealth
of Massachusetts requires the damper be permanently
removed or welded in the full open position. In addition, a
naturally vented gas log may not be installed in a bedroom
or bathroom in the commonwealth of Massachusetts.
Any modification to this gas log set or its controls can be dangerous. Improper
installation or use of the gas log set can cause serious injury or death from fire, burns,
explosion or carbon monoxide poisoning.
WARNING
This appliance is for installation only in
a solid fuel burning fireplace (masonry
fireplace or manufactured fireplace)
WARNING

4 32D1999
GETTING STARTED
MAKE SURE YOU HAVE RECEIVED ALL PARTS:
Check your packing list to verify that all listed parts have been received. You should have the following:
BURNER - GRATE ASSEMBLY 24/18, 30
• Burner and Grate Weldment Assembly • Lava Rocks (x2)
• Glowing Embers (Rock Wool) • Damper Clamp
• Installation /Operating Instructions • Masonry Screws (2)
• 3/8" Aluminum tube with 3/8" 90° elbow, 1/2" to 3/8" tubefitting
CERAMIC FIBER LOGS 24/18, 30
• Individual Logs • Installation Instructions
Carefully inspect the contents for shipping damage. If any parts are missing or damaged, immediately inform the dealer
from whom you purchased the appliance. Do not attempt to install any part of the appliance unless you have all parts
in good condition.
ITEMS REQUIRED FOR INSTALLATION
Ensure that the following items are available before proceeding with installation:
• External regulator (for propane/L.P.G. only) • Manual shutoff valve
• Piping which complies with local codes • Pipe wrench
• Tee joint
• Pipe sealant approved for use with propane/L.P.G. (Resistant to sulfur compounds)
• Drill with masonry bit (for mounting to the floor)
• Handle the gas log burner assembly by the grate only. Do not pick the unit up by the
burner.
• Gloves are recommended when handling ceramic fiber logs to prevent skin irritation
from loose fibers. Logs are fragile — handle with care.
CAUTION

32D1999 5
PRODUCT SPECIFICATIONS
NATURAL GAS
Manual Pressure Milli-Volt Pressure
Regulator Pressure Setting: 4" w.c. Regulator Pressure Setting: 4.0" w.c.
Gas Inlet Pressure: Max. 10 1/2" w.c. Gas Inlet Pressure: Max. 10 1/2" w. c. • Min. 6" w.c.
Min. 6" w.c.
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
Manual Pressure Milli-Volt Pressure
Regulator Pressure Setting: 10" w.c. Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Maximum 13" w.c. Gas Inlet Pressure: Maximum 13" w.c.
Minimum 11" w.c. Minimum 11" w.c.
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Manual control with pilot has three (3) positions:
OFF - All gas to the gas logs is shut off at the valve.
IGN - Valve position to light/maintain a standing pilot.
ON - Valve position to light/maintain the gas burner.
Manual control without pilot has two (2) positions:
OFF - All gas to the gas logs is shut off at the valve.
ON - Valve position to light/maintain the gas burner.
Milli-Volt control with pilot has three (3) positions:
OFF - All gas to the gas logs is shut off at the valve.
IGN - Valve position to light/maintain a standing pilot.
ON - Valve position to light/maintain the gas burner.
Model Number Pilot Control Type Gas Rate Min BTU/Hr
VDY24/18NMP Yes Manual (Thermocouple) 50,000
VDY24/18NM No Manual 50,000
VDY24/18VP Yes Milli-Volt (Thermopile) 50,000
VDY30NMP Yes Manual (Thermocouple) 65,000
VDY30NM No Manual 65,000
VDY30NVP Yes Milli-Volt (Thermopile) 65,000
Model Number Pilot Control Type Gas Rate Min BTU/Hr
VDY24/18PMP Yes Manual (Thermocouple) 50,000
VDY24/18PVP Yes Milli-Volt (Thermopile) 50,000
VDY30PMP Yes Manual (Thermocouple) 65,000
VDY30PVP Yes Milli-Volt (Thermopile) 65,000

6 32D1999
A
C
D
B
In compliance with IAS U.S. 7-94, ANS Z21.60-1996 • CGA 2.26-M96 and National Fuel Gas Code, Section 6.6
BEFORE INSTALLING THE APPLIANCE:
• Turn off gas supply to masonary fireplace or manufactured wood
burning firebox.
• Have the fireplace floor and chimney professionally cleaned to remove ashes,
soot, creosote or other obstructions. Have this cleaning performed annually
after installation.
• Seal any fresh air vents or ash clean-out doors located on floor or wall of
fireplace. If not, drafting may cause pilot outage or sooting. Use a heat-resistant sealant.
INSTALL AND OPERATE THE APPLIANCE AS DIRECTED IN THIS MANUAL.
DAMPER STOP INSTALLATION:
A damper stop is provided with the unit. The damper stop must be installed as shown in (Figure 2) to prevent full closure of
the fireplace damper blade and provide a minimum flue opening, per table below.
Should the clamp not fit, or provide the required permanent opening from the table have the damper blade cut to provide
minimum permanent opening or a permanent stop installed.
Damper Stop
Damper
Figure 2 - Damper Stop
Installation
MANUAL SERIES (W/ PILOT AND W/O PILOT)
MILLIVOLT SERIES (W/ PILOT)
PRODUCT / FEATURES SPECIFICATIONS
Figure 1 - Minimum Hearth Dimensions
Minimum Opening Area of Chimney
Damper for Venting
The fireplace and gas logs function
as a system. If the fireplace is spilling
into the room (check with a match or
smoke stick). Reposition the damper
clamp until a positive draft is obtained,
by opening the damper. If negative
pressure in the home prevents having
a positive draft contact your dealer.
WARNING
FOR MASSACHUSETTS RESIDENTS ONLY
Installation of this vented gas log set in the Commonwealth
of Massachusetts requires the damper be permanently
removed or welded in the fully open position. In addition, a
naturally vented gas log may not be installed in a bedroom
or bathroom in the Commonwealth of Masasachusetts.
Model A B C D
VDY 24/18 17 13 1/226 16
VDY 30 23 13 1/232 16
Model A B C D
VDY 24/18 18 13 1/226 16
VDY 30 24 13 1/232 16
Chimney
Height VDY24/18N VDY30N
6' 51 sq in 64 sq in
8' 51 sq in 64 sq in
10' 51 sq in 64 sq in
15' 39 sq in 51 sq in
20' 39 sq in 51 sq in
30' 39 sq in 51 sq in
39 sq in

32D1999 7
PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER
IMPORTANT INFORMATION FOR THE INSTALLATION OF THIS GAS LOG SET
The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front open-
ing of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.
Glass door frames
with adjustable
louvers should have
the lovers fully open
while the unit is in
operation.
Height of restrictive barrier
caused by glass door frames,
recessed fireplaces, etc. from
the base or bottom surface of the
unit. (Refer to Table).
The log set should be
placed against or as near
as possible to the rear wall
of the fireplace/firebox.
Depth of fireplace/firebox.
(Refer toTable).
Figure 3 - Reference Drawing of a Log Set in an Enclosure
NOTE: Non combustible material such as refractory brick may be used to line the floor of the fireplace
in order to raise the height of the gas log set in relation to a restrictive barrier. If the unit is raised, THE
MINIMUM HEIGHT DIMENSION LISTED IN THE HOMEOWNER’S MANUAL MUST NOT BE EXCEEDED.
NOTE: If the log set is equipped with a remote receiver, a restrictive barrier may reduce the battery life
by increasing the ambient temperature inside the fireplace. Placement of the receiver outside of the
fireplace will extend the battery life.
X
Barriers such as the bottom of a glass door frame placed in front of a gas log set can
change the air flow characteristics of the fireplace which in turn can cause the unit to
overheat and malfunction. Any deviation from the installation guidelines on this sheet
will potentially void the warranty.
WARNING
Height of Restriction (X) Minimum Depth of Fireplace/Firebox
No restriction 131/2"
0 to 1.5" 15"
Greater than 11/2" to 3" 15"
Greater than 3" ANY BARRIER GREATER THAN THREE INCHES (3") PLACED IN FRONT OF
THE GAS LOG SET IS NOT RECOMMENDED BY THE MANUFACTURER.

8 32D1999
PLACING AND SECURING APPLIANCE
Figure 4 - Securing Heater to Floor of Fireplace/Firebox
Left Side
Mounting
Hole
INSTALLATION
ASSEMBLY PROCEDURE
1. Center the gas log unit in the fireplace or firebox. Make certain the front feet of the grate sit inside the front edge of the
fireplace or firebox.
2. Refer to Figure 4 for hole locations. After centering the grate correctly, mark the hole positions on the fireplace/firebox
floor. Drill two (2) 5/32" diameter holes approximately 11/2" deep.
3. Anchor the grate to the fireplace/firebox floor using the screws provided. Refer to Figure 4.
Proper installation of the grate is essential to prevent any movement of the gas logs and controls
during operation.
Right Side Mounting Hole
You must secure the gas log heater to
the fireplace floor. Properly securing
the grate prevents movement of
the entire unit when you adjust the
controls. Grate movement could cause
a gas leak.
WARNING

32D1999 9
CONNECTING THE GAS
Pipe Coupling
To Gas Log
Regulator Manual Shutoff
Valve
Gas Supply Inlet
Figure 5 - Gas Connection
Pipe
IMPORTANT: Hold appliance regulator firmly with a wrench to prevent movement when connecting to inlet piping.
Check gas type: The gas supply must be the same as stated on the gas logs rating plate. If the gas supply is different, DO
NOT INSTALL THE GAS LOGS. Contact your dealer for the correct model.
Always use an external regulator for all propane/LPG gas logs only, to reduce the supply tank pressure to a maximum of
13" w.c. This is in addition to the regulator fitted to the gas log set. High pressure natural gas systems require a regulator to
reduce supply pressure to 10" W.C.
Locations that the Pressure Tapping
Point May be Installed
NOTICE: A qualified gas appliance
installer must connect the appliance
to the gas supply. Consult all local
codes before installation.
NOTICE
Use new black iron pipe, steel pipe, copper tubing, or internally tinned copper tubing.
Copper or internally tinned copper tubing can only be used according to the National
Fuel Gas Code, section 2.6.3, providing gas meets sulfide limits, and where permitted
by local codes. Gas piping system must be sized to provide minimum inlet pressure
(listed on Data Plate) at the maximum flow rate (BTU/Hr). Undue pressure loss will occur
if the pipe is too small.
A manual shutoff valve must be installed upstream of the appliance. Union tee and
plugged 1/8" NPT pressure tapping point should be installed upstream of the appliance.
Refer to Figure 5.
CAUTION
Connecting directly to an
unregulated propane/LPG tank can
cause an explosion
WARNING

10 32D1999
Figure 6 - Pressure Test Point Location
Test Plug
MANUAL CONTROL (Figure 6)
The pressure regulator is preset and locked to discourage
tampering. If the pressure is not as specified, replace with
the correct part from the parts list in this manual.
Remove 1/8" NPT plug, located on side of regulator body.
Install fitting and tubing to pressure gauge. After taking pres-
sure reading, re-install test plug. Check for gas leaks.
MILLIVOLT CONTROL (Figure 7)
The valve regulator controls the burner pressure which should
be checked at the pressure test point. Turn captured screw
counter clockwise 2 or 3 turns and then place tubing to pres-
sure gauge over test point (Use test point labeled “OUT”).
After taking pressure reading, be sure and turn captured screw
clockwise firmly to re-seal. Do not over torque. Check for
gas leaks.
Test Port
“Out”
Figure 7 - Pressure Test Point Location
CONNECTING THE GAS
The heater gas inlet connection is 3/8" NPT at the regulator, inlet on the right side facing the gas log. If a left side connection
is required, the connecting pipe may be led under the rear of the gas logs or behind the grate for connection to the inlet.
NOTE: The milli-volt valve has an internal regulator, thus the incoming gas line connects directly to
the valve.
Test all gas joints from the gas meter to the appliance regulator for leaks using a gas analyzer or soap and water solution after
completing connection. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning.