NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig (3450 Pa). Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig (3450 Pa). The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the
Check for gas leaks at the
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| ! | WARNING | |
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581J | FIRE OR EXPLOSION HAZARD | |||
Failure to follow this warning could result in personal | ||||
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| injury, death and/or property damage. |
SConnect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
SNever purge a gas line into a combustion chamber. S Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for the detection of leaks to check all connections.
S Use proper length of pipe to avoid stress on gas control manifold.
NOTE: If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A
Step 11 — Install External Condensate Trap and Line
The unit has one
When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightened with a
To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a
CONDENSATE PAN (SIDE VIEW) |
| ALTERNATE | ||
STANDARD | DRAIN PLUG | |||
BOTTOM DRAIN | ||||
SIDE DRAIN | ||||
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C08021
Fig. 22 - Condensate Drain Pan (Side View)
The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 23.
BURNER
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
TO ROOF
DRAIN
BASE RAIL
2˝ (51) MIN
OPEN
VENT
SEE NOTE
ROOF
CURB
DRAIN PLUG
ORIFICE
A93059
Fig. 21 - Orifice Hole
NOTE: Trap should be deep enough to offset maximum unit static difference. A 4” (102) trap is recommended.
C08022
Fig. 23 - Condensate Drain Piping Details
All units must have an external trap for condensate drainage. Install a trap at least
16