6 Gas connections (continued)
Installation & Operation Manual
WARNING
Use two wrenches when tightening gas piping at boiler (FIG.
Natural gas supply pressure requirements
1. Pressure required at the gas valve inlet pressure port: |
• Maximum 14 inches w.c. (3.5 kPa) with no flow |
(lockup) or with boiler on. |
• Minimum 5 inches w.c. (1.25 kPa) for 1.0 models with gas |
flowing (verify during boiler startup). |
• Minimum 4 inches w.c. (.99 kPa) for 1.3 - 1.5 models with |
gas flowing (verify during boiler startup). |
Figure 6-2 Inlet Pipe with Backup Wrench
USE BACK UP WRENCH TO
PREVENT PIPE FROM ROTATING
NOTICE | Maximum inlet gas pressure must not |
exceed the value specified. Minimum | |
| value listed is for the purposes of input |
| adjustment. |
Natural gas:
WARNING Check boiler rating plate to determine which fuel the boiler is set for. SYNC
boilers CANNOT be field converted. Failure to comply could result in severe personal injury, death, or substantial property damage.
Pipe sizing for natural gas
1.Refer to Table 6A for pipe length and diameter. Based on rated boiler input (divide by 1,000 to obtain cubic feet per hour).
a.Table 6A is only for natural gas with specific gravity 0.60 inches, with a pressure drop through the gas piping of 0.5 inches w.c.
b.For additional gas pipe sizing information, refer to ANSI Z223.1 (or B149.1 for Canadian installations).
2. Install 100% lockup gas pressure regulator in supply line |
if inlet pressure can exceed 14 inches w.c. (3.5 kPa) at any |
time. Adjust lockup regulator for 14 inches w.c. (3.5 kPa) |
maximum. |
Propane Gas:
WARNING | Check boiler rating plate to determine which |
| fuel the boiler is set for. SYNC boilers CAN |
| |
| NOT be field converted. Failure to comply |
| could result in severe personal injury, death, |
| or substantial property damage. |
Pipe sizing for propane gas
1.Contact gas supplier to size pipes, tanks, and 100% lockup gas pressure regulator.
Propane Supply Pressure Requirements
1.Adjust propane supply regulator provided by the gas supplier for 14 inches w.c. (3.5 kPa) maximum pressure.
2.Pressure required at gas valve inlet pressure port:
•Maximum 14 inches w.c. (3.5 kPa)with no flow (lockup) or with boiler on.
•Minimum 8 inches w.c. (1.9 kPa) with gas flowing (verify during boiler startup).
WARNING Ensure that the high gas pressure regulator is at least 10 feet (3 m) upstream of the
appliance.
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