IM 986-2 / Page 17 of 48
Before furring-in units, hydrostatically test the risers and
unit connection joints in accordance with local building
codes, to make sure they are leak-proof.
Note: Perform "Cleaning and Flushing Water
System" Procedure Below.
When furring-in units make sure that no screws or nails
penetrate the unit cabinet.
8. Layout the stud wall floor plates and frame-in
unit referencing “Typical Framing & Discharge
Arrangements” on page 13 and “Critical Dimensions”
on page 14 and table 1 .
Note: Before cutting and hanging drywall, remove
the appropriate discharge air opening knockout. See
Table 2). Protect unit from construction debris with a
protective cover.
Cleaning and Flushing Water
System
Prior to first operation of any unit, the water circulating
system must be cleaned and flushed of all construction dirt
and debris or damage will occur.
1. Prior to first operation of any unit, the water
circulating system must be cleaned and flushed of all
construction dirt and debris .
If the units are equipped with water shutoff valves,
either electric or pressure operated, the supply and
return runouts must be connected together at each
unit location . This will prevent the introduction of
dirt into the unit (Figure 26) .
CAUTION
Note: Be sure that each riser stub-out (supply &
return) are centered within the riser knockout in
the cabinet (Figure 25). If there is a void between
the stub-out and the stub-out seal on the cabinet
interior, this indicates that the stub-out is not properly
centered within the knockout.
Figure 25: Center the Riser Stub-Outs in the Knockouts and
within Seals on the Cabinet Interior
5 . Anchor risers to the building structure to prevent
vertical riser movement greater than, plus or minus
one inch to allow for riser expansion or contraction .
6 . Solder all supply and return riser connections to
units above and/or below .
7 . Remove riser ties used to secure the risers to the
cabinet during shipping .
Riser Knockouts
Stub-Out Connections with
Valves Centered within
Knockouts and Seals
Stub-Outs
Seals
Cabinet
Interior
Knockouts
on Cabinet
Exterior
CAUTION
WARNING
The unit is not designed to support the weight of the risers.
Anchor them securely to the building structure.
CAUTION
Discharge Openings
Unit Size
Single
Double
Triple
Single-Top Opening
W H W H W H W H
009–012
14"
16"
14"
8"
NR
NR
12"
12"
015–018
14"
16"
14"
8"
14"
8"
12"
12"
021–024
NR
NR
18"
14"
18"
10"
18"
18"
030–036
NR
NR
18"
14"
18"
10"
18"
18
Table 2: Discharge Knockout Openings
NR =
Not Recommended
Summary of Contents for IM 986-2 VHC
Page 2: ...Page 2 of 48 IM 986 2...
