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IM 1068-2 / Page 8 of 28
Installation
6. The piping for steam or hot water can be supplied from
either the right or left side of the coil. Hot water must be
supplied to the bottom of the coil, and steam to the top
of the coil. See Figure 6 through Figure 13 for specifics.
To simplify connections to the coil, use 5/8'' O.D. copper
tubing where local codes allow.
7. A shutoff valve is recommended on the supply and return
side of the coil.
8. When steam is used, a trap is required on the return side.
Trap size should be determined by the consulting engineer
or steam trap supplier, depending upon the type of system
and the pressure applied. When hot water is used, an air
vent must be installed at the highest point in the piping
connection. If the vent is not automatic, it should be piped
with easy access for regular maintenance. Caution: Locate
vent so it does not drip or spray on electrical components.
9. Insulate all exposed water or steam lines that are located
within the room cabinet. Failure to do this may cause
erratic operation of the thermostat.
10. Protect the heat section from damage during construction.
Do not operate the heat section without a filter or the
warranty will be void.
Suggested Piping Arrangements
Hot Water Supply
Figure 6: Detail A – Hot Water Supply R.H., Retun L.H.
W
S
T
V
CL
Return Stub
2"
(51mm)
2
5
/
8
"
(67mm)
Figure 7: Detail C – Hot water supply R.H., return R.H.
U
T
V
W
CL
1"
(25mm)
2"
(51mm)
Return
Stub
CL
Figure 8: Detail E – Hot water supply L.H., return R.H.
2"
(51mm)
Return Stub
2
5
/
8
"
(67mm)
V
S
U
W
CL
CL
Figure 9: Detail G – Hot water supply L.H., return L.H.
2"
(51mm)
Return Stub
1" (25mm)
W
V
U
S
CL
CL
Steam Supply
Figure 10: Detail B – Steam supply R.H., return L.H.
Y
S
T
V
Return Stub
2"
(51mm)
2
5
/
8
"
(67mm)
CL
CL
Figure 11: Detail D – Steam supply R.H., return R.H.
U
T
V
Y
2"
(51mm)
Return Stub
1"
(25mm)
CL
CL
Figure 12: Detail F – Steam supply L.H., return R.H.
2
5
/
8
"
(67mm)
Return Stub
2"
(51mm)
V
S
U
Y
CL
CL
Figure 13: Detail H – Steam supply L.H., return L.H.
1"
(25mm)
Return Stub
2"
(51mm)
V
Y
U
S
CL
CL
S
T
U
V
W
Y
in.
19
1
⁄
4
21
3
⁄
4
21
1
⁄
4
10
1
⁄
2
23
1
⁄
2
20
1
⁄
4
mm
489
552
540
267
597
514
Notes:
Available on size 009 – 014 only.
Available on size 009 – 014 only.
Available on size 009 – 014 only.
Available on size 009 – 014 only.
Summary of Contents for IM 1068-2
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