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OWNER'S MANUAL
towards the thermostat. (At the thermostat, the wires
should be connected to the two connection screws on the
back of the thermostat per the instructions received with
the thermostat).
Take care not to over-tighten the
connection screws and not to damage the internal parts
of the thermostat. Now attach the wires in their proper
location on the firebox.
GAS SUPPLY AND CONNECTIONS
NOTICE: A qualified technician must connect the
heater to the gas supply and leak test the unit before
it is approved for use. Consult all local codes.
WARNING: The unit must be installed and connected
in accordance with local codes, or in the absence of local
codes, with the most current edition of the National Fuel
Gas Code ANSI Z223.1.
We recommend using new black iron or steel pipe only.
Internally tinned copper tubing can be used in some
areas when permitted by local codes. Only use pipe of
sufficient diameter to allow full gas volume to heater,
without undue loss of pressure. Excessive pressure loss
will occur if the pipe is too small.
The gas supply line must include a manual shut-off
valve and union so the unit can be disconnected for
servicing.
Also a sediment trap and a 1/8" N.P.T.
plugged tapping must be installed upstream of the
heater. The sediment trap is installed to prevent moisture
and contaminants from passing through the pipe to the
heater controls and burners. Failure to install a sediment
trap could prevent the heater from operating reliably.
The 1/8" N.P.T. plugged tapping is installed for the test
Figure 8
gauge connection (immediately upstream of the gas
supply connection). Damage to the valve caused by
lack of a sediment trap will not be covered by the
warranty.
We have supplied a 36" flexible stainless steel gas line
for installation convenience and to avoid undue
mechanical load on the valve. We recommend using the
flexible line, but also refer to local code. The gas supply
line connection is made to the flexible line in the lower
rear right portion of the DVI-Ht. Apply a thread sealant
to both male ends on the flexible gas line. Thread one
end directly into the valve and the other to a 3/8"
connector on the gas line.
CAUTION: Check Gas Type! This unit is supplied as
NG only. A LP conversion is also supplied. A qualified
technician must do the conversion. The gas supply must
be the same as stated on the heater's rating plate (located
on the unit). If the gas supply is different, DO NOT
INSTALL the heater.
correct model or conversion kit.
Gas Pressure Adjustment:
TECHNICIAN MUST PERFORM THIS PROCEDURE
The supply line pressure is tested, to ensure it meets
minimum pressure requirements, as listed in the
Specifications sections of this manual, for the type of
fuel in use (NG or LP). The unit 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. During tests in excess of 1/2 psig. (14"
11
Model # 8890 DVI-Ht
Contact your dealer for the
A QUALIFIED
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