17
Fig. 17 — Locate 42SU Unit Knockouts
Fig. 18 — Remove 42SU Unit Knockouts
Fig. 19 — 42SU Unit Knockout Insulation Removal
Submittals and product literature detailing unit operation,
controls, and connections should be thoroughly reviewed BE-
FORE beginning the connection and testing of risers and
piping.
To assure optimal unit performance, the supply connection(s)
are marked on the unit’s coil with an “S” meaning supply or
inlet and “R” meaning return or outlet indicating flow direc-
tion to and from the coil. Blue letters mark the chilled water
connections and red letters mark the hot water connections.
The unit’s internal piping is designed to accommodate a total
riser vertical movement of ±1½ in., due to thermal expansion
and/or contraction, when positioned properly at the jobsite.
Risers must be anchored to the building structure to limit ex-
pansion and contraction movement to a maximum of 3 inch-
es. Riser anchoring and expansion compensation is not in-
cluded in the unit and must be provided. Riser end caps, air
vents, and/or flushing loops must be provided at the jobsite
by the installer.
Proper field riser installation and vertical positioning in the
unit should have a pipe run-out to the service valves which
are centered in the knockout access slots and that slope down
slightly away from the riser (see Fig. 20). This prevents con-
densation from running back to the riser and possible damage
from dripping at the bottom of a riser column. Each job has
specific requirements and satisfying those requirements is the
responsibility of the installer.
Riser to Unit Installation
Before making the riser joints, the riser insulation must be
pulled back away from the joint and protected from heat
during the brazing process. Each riser joint must be in vertical
alignment. Variations in floor-to-floor dimensions may re-
quire field work such as cutting off or extending the risers.
This operation is the responsibility of the installer. The riser
joint filler material must be selected to withstand the total op-
erating pressure (both static and pumping head) to which the
system will be subjected. Low temperature lead alloy solders
such as “50/50” and “60/40” are normally not suitable.
Riser to Drain Installation
1. After the applicable supply, return, and drain knockouts
have been removed, carefully position the unit so that the
riser ball valves penetrate into the unit through the riser
TOP SUPPLY
AIR KNOCKOUT
TOP VIEW
ELECTRICAL
KNOCKOUTS
SIDE SUPPLY AIR
KNOCKOUT
1 PER SIDE
RISER KNOCKOUTS
4 PER SIDE,
EXCEPT ON
RETURN AIR SIDE
DRAIN KNOCKOUT
1 PER SIDE,
EXCEPT ON
RETURN AIR SIDE
OUTSIDE AIR
KNOCKOUT
2 SIDES ONLY,
ADJACENT TO
RETURN AIR
OPENING
SIDE VIEW
RETURN
AIR
OPTIONAL
ELECTRICAL
KNOCKOUTS
KNOCKOUT
SLOT
KNOCKOUT
TAB
KNOCKOUT
KNOCKOUT
TAB
DRAIN
KNOCKOUT
SUPPLY AND RETURN
CAUTION
Toxic residues and loose particles resulting from manu-
facturing and field piping techniques such as joint com-
pounds, soldering flux, and metal shavings may be pres-
ent in the unit and the piping system. Special consider-
ation must be given to system cleanliness when
connecting to solar, domestic or potable water systems.
DRAIN
INSULATION
CUT LINE
SUPPLY AND RETURN
INSULATION CUT LINE
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