Vanguard VMH2800TNC Owner's Operation And Installation Manual - Gas Residential Heaters
12
103506
GAS RESIDENTIAL HEATERS
®
INSTALLATION
Continued
C. MOUNTING HEATER
WITH
OPTIONAL HEARTH BASE
(WHERE APPLICABLE) TO
OPTIONAL MANTEL. See
instructions included with
mantel kit.
Assembling Mantel
IMPORTANT:
Only use the optional man-
tels specified in this manual. See Accesso-
ries, page 20 for proper mantel kits. This
heater is only approved for use with models
GMF800/GMU801 series, GM900F/
GM901U series, GM902F/GM903U series,
and GM700F/GM701U series mantel kits.
Using any other mantel will void the A.G.A.
approval for this heater. Only use models
GMF800/GMU801 series, GM900F/
GM901U series, GM902F/GM903U series
and GM700F/GM701U series mantels with
this heater. Do not use these mantels with
any other product. Before installing, all
mantels except the GM902F/GM903U se-
ries mantel, the heater must be mounted on
the optional hearth base.
Installing Mantel to Heater
WARNING: If installing the
GHB802 or GHB802A base on
heater, and using with a GA se-
ries heater blower accessory
along with a GS601 surround or a
GM800 or GM900 series mantel,
the surround or mantel clearance
to back wall should be 3/4 inch.
This will improve flame appear-
ance and combustion. This space
is not necessary if using a
GHB802B or GHB802C hearth
base. Use only a GHB802B or
GHB802C hearth base if using a
GA series heater blower acces-
sory with a GM700 series mantel.
CONNECTING TO
GAS SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as wellhead gas.
IMPORTANT:
Check gas line pressure be-
fore connecting heater to gas line. Gas line
pressure must be no greater than 14 inches
of water. If gas line pressure is higher,
heater regulator damage could occur.
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"
or greater diameter to allow
proper gas volume to heater. If
pipe is too small, undue loss of
pressure will occur.
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 20).
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection *
Tee Joint
Pipe
Nipple
Cap
Sediment
Trap
Pressure
Regulator
3/8" NPT
Pipe Nipple
Ground
Union
Joint
Heater
Cabinet
3" Minimum
Note:
Burner bracket
not shown for clarity
Manual Shutoff Valve *
From Gas Meter
(4" W.C. to 10.5" W.C. Pressure)
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 20. 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.
IMPORTANT:
Hold pressure regulator with
wrench when connecting it to gas piping
and/or fittings.
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design-certified manual
shutoff valve from your dealer. See Accessories, page 20.
Figure 20 - Gas Connection