Vermont Castings Duzy Series User manual

Installation and
Operating Instructions
Approved to ANSI Z21.60 / CSA 2.26
WARNINGS
If the information in this manual is not followed
exactly, a re or explosion may result causing
property damage, personal injury or loss of
life.
– Do not store or use gasoline or other
ammable 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 re department.
– Installation and service must be performed
by a qualied installer, service agency or the
gas supplier.
This gas log set is to be installed only in a
solid-fuel burning replace with a working
ue constructed of noncombustible material.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future refer-
ence.
VDY24/18D4
VDY30D3R
VDY24/18D5
VDY24/18D2A
321999
VDY log cover
Vented Gas Log Set
Models:
VDY24/18, VDY30
Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
"Duzy" Series

"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
2Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
Important Safety Information .................................... 3
Getting Started ........................................................... 4
Check for Correct Parts .......................................... 4
Items Required for Installation ................................ 4
Product Specications ............................................... 4
Gas Pressures ........................................................ 4
Gas Specications .................................................. 4
Ignition Controls ...................................................... 4
Minimum Hearth Dimensions.................................. 5
Damper Stop Installation......................................... 5
Placement in a Fireplace with a Restrictive Barrier 6
Installation ................................................................... 7
Place and Secure Appliance ................................... 7
Assembly Procedure............................................... 7
Gas Line Connection .............................................. 7
Electrical Wiring - Millivolt.......................................... 9
Check System Operation ........................................ 9
Log Placement .......................................................... 10
VDY24/18D2 ......................................................... 10
VDY30D2A............................................................ 11
VDY24/18D3R ...................................................... 12
VDY30D3R ........................................................... 13
VDY24/18D4 ......................................................... 14
VDY30D4 .............................................................. 16
VDY24/18D5 ......................................................... 18
VDY30D5 .............................................................. 20
Glowing Ember Placement ................................... 22
Decorative Volcanic Rock Placement ................... 22
CONTENTS
Fireplace Draft Test .................................................. 22
Flame Appearance .................................................... 23
Operating Instructions ............................................. 24
For Your Safety Read Before Lighting ................. 24
Manual Control Lighting Instructions .................... 24
Millivolt Control Lighting Instructions .................... 25
To Turn Off Gas to Heater..................................... 25
Match Lighting Instructions ................................... 25
Optional Remote Receiver (Millivolt)....................... 26
Cleaning and Servicing ............................................ 27
Troubleshooting ....................................................... 28
Service Parts.............................................................. 30
Accessories ............................................................... 38
Massachusetts Requirements.................................. 39
Warranty ..................................................................... 40
Thank you and congratulations on your purchase of a
Hearth & Home Technologies 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 re hazard and will void the warranty.

3
"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
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 ANSI Z21.60 • CSA 2.26 Dec-
orative Gas Appliance for Installation in Solid-Fuel
Burning Fireplace.
3. Installation and repair should be done by a qualied
service person. Hearth & Home Technologies Vented
Gas Logs must be installed only in a solid-fuel (wood)
burning replace which can only be constructed of
non-combustible material, with minimum venting
requirements, see installation section.
4. To prevent malfunction, gas log set and ue 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 compartments, burners and circulating air
passageways be kept clean.
5. Correct installation of the ceramic ber logs, and
annual cleaning are necessary to minimize problems
with sooting. See log placement instructions for proper
installation.
6. A damper clamp must be installed to provide the min-
imum permanent vent opening to vent ue products,
See installation instructions.
7. Never burn solid fuels in a replace where a gas log
set is installed.
8. This appliance must not be used with glass doors
in the closed position. Provisions for adequate com-
bustion air must be provided, adequate combustion air
usually results in all ames curling into the replace
away from screen and up the ue.
9. Keep room area clear and free from combustible mate-
rials, gasoline and other ammable 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 oper-
ation.
12. Do not place clothing or other ammable material near
the replace when the gas logs are in use.
IMPORTANT SAFETY INFORMATION
13. Do not use this gas log set if any part has been under-
water. Immediately call a qualied 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
piping 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 addi-
tion, a naturally vented gas log may not be installed
in a bedroom or bathroom in the commonwealth of
Massachusetts.
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference .
WARNING
• Any change 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.
IMPORTANT
Read these instructions carefully before
installing or trying to operate this vent-free
gas heater.
WARNING
This appliance is for installation only in
a solid fuel burning fireplace (masonry
replace or manufactured replace)
Nous recommandons que nos
appareils de chauffage au gaz
soient installés et entretenus par
des professionnels qui ont été
accrédités aux È.U. par le National
Fireplace Institute ® (NFI) comme
étant des spécialistes du NFI en
matièred’appareils de chauffage
au gaz.

"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
4Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
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 (2)
• 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"
tube tting
CERAMIC FIBER OR REFRACTORY CE-
MENT 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 pro-
ceeding 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 oor)
FEATURES & SPECIFICATIONS
GAS PRESSURES
Natural *Propane (LP)
Inlet Minimum 6.0” w.c. 11.0” w.c.
Inlet Maximum 10.5” w.c. 13.0” w.c.
Regulator Pressure 4.0” w.c. 10.0” w.c.
*NOTE: An external regulator is required to reduce supply pres-
sure to a maximum of 13” w.c.
CAUTION
• 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 ber logs to prevent skin irritation
from loose fibers. Logs are fragile —
handle with care.
GAS SPECIFICATIONS
Gas Rate
Min. Input
Model Fuel Control BTU/h
VDY24/18NMP Nat. Manual (thermocouple) 50,000
VDY24/18PMP LP Manual (thermocouple) 50,000
VDY24/18NVP Nat. Millivolt (thermopile) 50,000
VDY24/18PVP LP Millivolt (thermopile) 50,000
VDY30NMP Nat. Manual (thermocouple) 65,000
VDY30PMP LP Manual (thermocouple) 65,000
VDY30NVP Nat. Millivolt (thermopile) 65,000
VDY30PVP LP Millivolt (thermopile) 65,000
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.
Millivolt 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.
WARNING: This product and the
fuels used to operate this product (liquid
propane or natural gas), and the products
of combustion of such fuels, can expose
you to chemicals including benzene, which
is known to the State of California to cause
cancer and reproductive harm. For more
information go to: www.P65Warnings.
ca.gov.

5
"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
PRODUCT SPECIFICATIONS
FP2725
min hearth dims
D
A
B
C
MINIMUM HEARTH DIMENSIONS
MANUAL SERIES
Model A B C D
VDY24/18 17" 13Z\x" 26" 16"
(432 mm) (343 mm) (660 mm) (406 mm)
VDY30 23" 13Z\x" 32" 16"
(584 mm) (343 mm) (813 mm) (406 mm)
MILLIVOLT SERIES
VDY24/18 18" 13Z\x" 26" 16"
(457 mm) (343 mm) (660 mm) (406 mm)
VDY30 24" 13Z\x" 32" 16"
(610 mm) (343 mm) (813 mm) (406 mm)
Figure 1 -
Minimum Hearth Dimensions
BEFORE INSTALLING THE APPLIANCE:
• Turn off gas supply to Masonry fireplace or
manufactured wood burning rebox.
• Have the replace oor 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 locat-
ed on oor or wall of replace. 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 clo-
sure of the replace damper blade and provide a minimum
ue opening, per table below.
Should the clamp not t, or provide the required perma-
nent opening from the table have the damper blade cut
to provide minimum permanent opening or a permanent
stop installed.
FP2727
damper
Damper Stop
Damper
ST2727
Figure 2 -
Damper Stop Installation
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 Massachusetts.
Chimney
Height VDY24/18 VDY30
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' 30 sq in 51 sq in
The fireplace and gas logs function as
a system. If the replace 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
Minimum Opening Area of Chimney Damper
for Venting

"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
6Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
IMPORTANT INFORMATION FOR THE IN-
STALLATION OF THIS GAS LOG SET
The following are guidelines for placing a gas log set
in a replace that has a restrictive barrier along the
bottom front opening of the replace. Some examples
of barriers are glass/screen door frames and sunken/
recessed replaces.
Height of Minimum Depth of
Restriction (x) Fireplace/Firebox
No Restriction 23Z\x”
0 to 3” 15”
Greater than 3” *
*Any barrier greater than 3” placed in front of the gas log
set is not recommended by the manufacturer.
NOTE: Non combustible material such as refractory brick
may be used to line the oor of the replace 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 replace. Placement
of the receiver outside of the replace will extend the
battery life.
X
FP2854
logs in enclosure
Glass door
frames with
adjustable
louvers
should have
the louvers
fully open
while the unit
is in operation
Height of restrictive
barrier caused by glass
door frames, recessed
replaces, etc. from the
base or bottom surface of
the unit. (Refer to Table)
Refer to
Table
FP2854
Figure 3 -
Reference Drawing of Log Set in an Enclosure
The log set
should be
placed against
or as near as
possible to the
rear wall of the
replace/rebox.
WARNING
Barriers such as the bottom of a glass door
frame placed in front of a gas log set can
change the air ow characteristics of the
replace 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.

7
"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
PLACE AND SECURE APPLIANCE
INSTALLATION
ASSEMBLY PROCEDURE
1. Center the gas log unit in the replace or rebox. Make
certain the front feet of the grate sit inside the front edge
of the replace or rebox.
2. Refer to Figure 4 for hole locations. After centering the
grate correctly, mark the hole positions on the replace/
rebox oor. Drill two (2) 5/32" diameter holes approx-
imately 1Z\x" deep.
3. Anchor the grate to the replace/rebox oor using the
screws provided. Figure 4
Proper installation of the grate is essential to prevent any
movement of the gas logs and controls during operation.
WARNING
You must secure the gas log heater to the
replace oor. Properly securing the grate
prevents movement of the entire unit when
you adjust the controls. Grate movement
could cause a gas leak.
Figure 4 -
Securing Heater to Floor of
Fireplace/Firebox
Left Side
Mounting
Hole
Right Side Mounting Hole
FP2855
secure burner
FP2855
GAS LINE CONNECTION
NOTICE: A qualied gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
CAUTION
Use new black iron or steel pipe. Internally
tinned copper or copper tubing can be
used per National Fuel Code, section 2.6.3,
providing gas meets hydrogen 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 ow 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. Figure 5
FP2371
gas connect
Stainless
Flexible
Tube Pipe
Possible Locations
for Pressure
Tapping Point
To
Heater
Valve
Pipe
Coupling
Manual Shutoff
Valve FP2371
Figure 5 -
Gas Connection
IMPORTANT: Hold appliance regulator rmly 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 tted to the
gas log set. High pressure natural gas systems require a
regulator to reduce supply pressure to 10" w.c.
WARNING
Connecting directly to an unregulated
propane/LPG tank can cause an explosion

"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
8Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
GAS LINE CONNECTION
The heater gas inlet connection is 3/8" NPT at the reg-
ulator, 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 millivolt 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.
MANUAL CONTROL
Figure 6
The pressure regulator is preset and locked to discourage
tampering. If the pressure is not as specied, replace with
the correct part from the parts list in this manual.
Remove 1/8" NPT plug, located on side of regulator body.
Install tting and tubing to pressure gauge. After taking
pressure reading, re-install test plug. Check for gas leaks.
FP2499
manual valve
NPT Test Plug
FP2499
Figure 6 -
Manual Control Pressure
Test Point Location
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 pressure gauge over test point (Use test point labeled
“OUT”). After taking pressure reading, be sure and turn
captured screw clockwise rmly to re-seal. Do not over
torque. Check for gas leaks.
FP2856
millivolt valve
Test Port "Out"
FP2856
Figure 7 -
Pressure Test Point Location

9
"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
ELECTRICAL WIRING
Label all wires prior to disconnection when
servicing controls.
Wiring errors can cause improper and
dangerous operation.
Verify proper operation after servicing.
WARNING
FP2857
millivolt wiring
THTP
TP
TH
Optional Wall Switch
or Remote Receiver
Switch
Millivolt
Valve
Pilot
Figure 8 -
Wiring Diagram
FP2857
The Millivolt (thermopile) is a self powered combination
gas control that does not require 110VAC to operate. See
Figure 8 and installation instructions provided with option-
al wall switch or remote control for wiring instructions. A
maximum length of 15 feet of 18awg two conductor wire is
to be used for wall switch. Note switches must be suitable
for millivolt operation.
CHECKING SYSTEM OPERATION
The millivolt system and individual components may be
checked with a millivolt meter having a 1-1000 mV range.
Conduct each check shown in chart by connecting meter
test leads to terminals as indicated.
A. Complete Millivolt System Check
(“A” Reading - Contacts CLOSED - Control knob “ON”
- Main burner should turn ON)
1. If reading is more than 100 millivolts and the au-
tomatic valve still does not come on, replace the
control.
2. If the closed circuit reading (“A” reading) is less
than 100 millivolts, determine cause for low read-
ing, proceed to Section B.
B. Thermopile Output Reading Check
(“B” Reading - Contacts OPEN - Main burner OFF
1. 325 millivolts minimum. If the minimum millivolt
reading is not obtainable, readjust pilot for maxi-
mum millivolt output. If millivolt reading is still below
minimum specied, replace thermopile.
Connect Meter
Check Meter Leads Reading
Test To Test To Terminals Should Be
A Complete TH & THTP Minimum
System 100mV
B Thermopile TP & THTP Minimum
Output 325mV

"Duzy" Gas Log Sets – The Look and Feel of a Real Wood Fire
10 Hearth & Home Technologies • VDY 24/18/30 Gas Log Heater Install/Owner's Manual • 32D1999 • Rev D • 05/19
LOG PLACEMENT
IMPORTANT: Remove logs, handling carefully by holding
gently at each end. Gloves are recommended to prevent
skin irritation from ceramic bers. If skin becomes irritated,
wash gently with soap and water.
LOG PLACEMENT
DUZY II VDY24/18D2A
1. Install the rear log (#1) on the two locating pins of base.
Figure 9. Visually check to verify the log is securely
placed on the pins and in contact with the grate. Figure
10
LG972
VDY24_18D2 base
Locator Pins
Control
Cover
LG972
Figure 9
LG971
VDY24_18D2A rear log
Rear Log #1
LG971
Figure 10
2. Install the right log (#2) on top of the control cover. Slide
the log back until touching the rear log (#1). Visually
check to verify the log is resting on the grate and control
cover. Figure 11
3. Install the left log (#3) with its bottom groove resting on
the right side of the grate bar. Slide the log back until
touching the rear log (#1). Visually check to verify the
log is resting on the grate. Figure 12
LG973
VDY24_18D2A right log
Right
Log #2
LG973
Figure 11
LG974
VDY24_18D2A left log
Left Log #3
Bottom Groove
LG975
Figure 12
4. Install the top log (#4) with the base sitting on the rear
log (#1) and the top sitting on log (#4). Visually check
to verify the log is resting on the rear log (#1) and left
log (#3). Figure 13
LG975
VDY24_18D2A top log
Top Log #4
Figure 13 LG975