Gas Supply; Gas Pres Sures & Piping - Lochinvar 000 - 500 Installation And Service Manual

GAS SUPPLY

Verify that the appliance is supplied with the type gas
spec i fied on the rating plate. This appliance is orificed
for operation up to 2000 feet altitude. The ap pli ance
will be derated 4% per 1000 feet above 2000 feet el e va -
tion. Consult the factory for installations above 2000
feet elevation. Field conversions for operation at high
altitude must be performed by certified per son nel only.
The appliance will be marked to indicate suitability for
high al ti tude operation.
GAS SUPPLY PRESSURE: Measured at the inlet
pres sure tap located upstream of the combination gas
valve(s) see Figures 20 - 22, page 17.
TABLE - C
GAS SUPPLY PRESSURE
Max. (Inches Water Column) 10.5
Min. (Inches Water Column)
Min. (Inches Water Column) **5.0
*Models 45,000 - 360,000 Btu/hr Only
**Models 399,999 - 500,000 Btu/hr Only
Maximum inlet gas pressure must not exceed the val ue
specified. Minimum value listed is for the purposes of
input adjustment.
MANIFOLD PRESSURE: Measured at the pres sure
tap on the downstream side of the com bi na tion gas
valve(s) (see Figures 20 - 22 on page 17). The gas
regulator settings for single stage and two stage
operation are factory set to supply proper manifold
pressure for normal operation.
pressure, see
increase manifold pressure beyond spec i fied
pressure settings shown below in Table D.
Btu/hr
Input Gas
45,000
75,000
90,000 - 180,000
199,999
215,000 - 399,999
500,000
Nat. Gas LP Gas
13
*4.5 11
11
To check manifold
. Do not
TABLE - D
MANIFOLD PRESSURE
Single and Two-Stage
Full or High Fire Settings
Natural Gas L.P. Gas
3.5" 10"
2.4" 7"
3.5" 10"
2.9" 7.5"
3.5" 10"
3.5" 10" (two valves)
GAS PRESSURE TEST
1. The appliance must be disconnected from the
gas supply piping system during any pressure
testing of that system at a test pressure in
excess of 1/2 PSIG (3.5kPa).
2. The appliance must be isolated from the gas
supply piping system by closing a 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).
3. The appliance and its gas connection must
be leak-tested before placing it in operation.
GAS CONNECTION
1. Safe operation of the appliance requires
properly sized gas supply piping. See data
in Table E.
2. Gas pipe size may be larger than appliance
gas connection.
3. Installation of a union is suggested for ease
of service, see Figure 16 on page 14.
4. Install a manual main gas shutoff valve,
outside of the appliance gas connection and
before the gas valve or manifold connection,
when local codes require.
5. A trap (drip leg) MUST be provided by the
installer in the inlet of the gas connection to the
appliance, see Figure 16 on page 14.
6. The combination gas valve has an integral
vent lim it ing device and does not require
venting to atmosphere, outside the building.
Two Stage
Low Fire Settings
Natural Gas
0.9"
0.9"
0.9"
0.9"
0.9"
N/A
12
L.P. Gas
2.5"
2.5"
2.5"
2.5"
2.5"
N/A