Connecting To Gas Supply - Desa VYM27NR Owner's Operation And Installation Manual

INSTALLATION
Continued
7. Mark screw locations through one hole
on each side of the mounting flanges
(see Figure 12). If installing in a brick-
bottom fireplace, mark screw locations
in mortar joint of bricks.
8. Remove heater base from fireplace.
9. Drill holes at marked locations using
3/16" drill bit.
10. Attach base assembly to fireplace floor
using two masonry screws (in hardware
package).
11. Connect to gas supply. See Connect-
ing To Gas Supply, page 11.
12. Replace logs on heater base.
Flexible Gas
Hose (if allowed
Fitting
by local codes)
Figure 11 - Attaching Flexible Gas Hose
to Heater
Masonry Screw
Figure 12 - Attaching Base Assembly to
Fireplace Floor
104674
CONNECTING TO GAS
SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
Installation Items Needed
Before installing heater, make sure you have
the items listed below.
• piping (check local codes)
• sealant (resistant to LP gas)
• manual shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* An A.G.A. design-certified manual shutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur-
chase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See
Accessories, page 24.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as wellhead gas.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of 1/2"
diameter or greater to allow
proper gas volume to heater. If
pipe is too small, undue loss of
pressure will occur.
Mounting
Flanges
Gas Control
Figure 13 - Gas Connection
* Purchase the optional A.G.A. design-certified manual shutoff valve from your dealer. See
Accessories, page 24.
** Minimum inlet pressure for purpose of input adjustment.
OWNER'S MANUAL
Approved Flexible Gas
Hose (if allowed by
local codes)
11
Installation must include a manual shutoff
valve, union, and plugged 1/8" NPT tap.
Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from
heater (see Figure 13).
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
from going into pipe. Excess sealant in pipe
could result in clogged heater valves.
CAUTION: Use pipe joint seal-
ant that is resistant to liquid pe-
troleum (LP) gas.
Install sediment trap in supply line as shown
in Figure 13. Locate sediment trap where it
is within reach for cleaning. Locate sedi-
ment trap where trapped matter is not likely
to freeze. A sediment trap traps moisture
and contaminants. This keeps them from
going into heater controls. If sediment trap
is not installed or is installed wrong, heater
may not run properly.
CAUTION: Avoid damage to
control. Hold gas fitting with
wrench when connecting it to gas
piping and/or fittings.
A.G.A. Design-Certified
Manual Shutoff Valve With
1/8" NPT Tap*
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)
Tee
Joint
3" Minimum
Pipe
Nipple
Cap
Sediment
Trap
Continued