Lochinvar 000 - 500 User Manual

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.

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.  To check manifold
pressure, see Manifold  Ad just ment  Procedure.  Do not
increase manifold pressure beyond spec 

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.

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.  

Max. (Inches Water Column)   10.5             13

Min. (Inches Water Column)    *4.5             11
Min. (Inches Water Column)  **5.0             11

*Models 45,000 - 360,000 Btu/hr Only
**Models 399,999 - 500,000 Btu/hr Only

45,000

3.5" 10"

0.9"

2.5"

75,000

2.4"

7"

0.9"

2.5"

90,000 - 180,000

3.5"

10"

0.9"

2.5"

199,999

2.9"

7.5"

0.9"

2.5"

215,000 - 399,999

3.5"

10"  

0.9"

2.5"

500,000

3.5"

10" (two valves)

N/A

N/A