Rapid 4044, Installation, Operation & Service Manual

Page: 78 / 162

4000-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
70 of 154
SECTION 1 8 : GAS PIPING
1 8 .1 Gas Manifolds
All gas piping to the air handler m u st comply w ith:
United States: Refer to NFPA 54/ANSI Z223.1 - latest
re
v ision, National F u el Gas Code.
Canada: Refer to CSA B149.1 - latest re v ision,
Nat u ral Gas and Propane Installation Code.
The air handlers are a v ailable w ith three gas manifold
options.
• American National Standards Instit u te (ANSI)
compliant manifold: ( See Page 71, Figure 55 ).
• Factory M u t u al (FM)-compliant manifold:
( See Page 72, Figure 56 ).
• XL Ins u rance (former IRI)-compliant manifold:
( See Page 73, Figure 57 ).
1 8 .2 Gas Pipin g and Pressures
The air handler is eq u ipped w ith a gas manifold
s u itable for connection to s u pply press u re of u p to 5
p.s.i. maxim u m for all manifold types.
When gas s u pply exceeds the abo v e-listed maxim u m
gas press u res, an additional high press u re gas
reg u lator w ill be req u ired to ass u re that the correct
gas press u re is s u pplied to the air handler.
O u tlet press u re from the reg u lator / inlet press u re to
air handler sho u ld be meas u red at the inlet of the air
handler gas manifold.
Minim u m gas press u re as indicated on data plate
m u st be meas u red w ith the b u rner operating in high
fire.
Minim u m inlet gas press u re is determined by gas
train size and BTU/h rating.
WARNING
Explosion Hazard
Leak test all components of gas piping
before operation.
Gas can leak if piping is not installed
properly.
Do not high pressure test gas piping with air
handler connected.
Failure to follow these instructions can result
in death, injury or property damage.