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VZ-VZH-VZT-IOM (08-24) 1047121-A
Figure 28. Flexible Gas Connector—Incorrect Installation
⚠ CAUTION ⚠
A field-supplied pressure regulator is required if the gas supply pressure exceeds 14 IN WC.
2. Immediately upstream of appliance and close to heater, install field-supplied connections as shown in Figure
29. Plugged 1/8-inch NPT tap on manual shutoff valve provides connection for supply line pressure test gauge.
3. Install flexible gas connector with shutoff valve in U-configuration as shown in Figure 29. Care must be taken to
observe pipe bend diameter of 12 inches (30 cm) and pipe displacement distance of 3 inches (8 cm), which is
for cold condition and may reduce when unit is fired.
4. Leak-test all connections by brushing on leak-detecting solution. Bleed trapped air from gas lines as needed.
⚠ CAUTION ⚠
Take care when making gas connections to the heater not to apply excessive turning force to the
internal controls. Hold the gas connection pipe nipple securely with a pipe wrench when tightening
the flexible gas connector.
NOTE: The gas meter and service MUST BE large enough to handle all burners being installed plus
any other connected load. The gas supply to the unit MUST BE sufficient to adequately handle a
maximum pressure drop of 1/2 IN WC.
1. See Figure 28, which shows potential incorrect flexible gas connector installation positions. Ensure that connector
is not installed in any of these positions.
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