IM 1068 / Page 7 of 32
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 Detail A through H for specics. 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
lter or the warranty will be void.
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
Detail G — Hot water supply L.H., return L.H. Detail H — Steam supply L.H., return L.H.
W
S
T
V
C
L
Return Stub
2"
(51mm)
2
5
/
8
"
(67mm)
U
T
V
W
C
L
1"
(25mm)
2"
(51mm)
Return
Stub
2"
(51mm)
Return Stub
2
5
/
8
"
(67mm)
V
S
U
W
C
L
2" (51mm)
Return Stub
1" (25mm)
W
V
U
S
C
L
Y
S
T
V
Return Stub
2"
(51mm)
2
5
/
8
"
(67mm)
C
L
U
T
V
Y
2"
(51mm)
Return Stub
1"
(25mm)
C
L
2
5
/
8
"
(67mm)
Return Stub
2"
(51mm)
V
S
U
Y
C
L
1"
(25mm)
Return Stub
2"
(51mm)
V
Y
U
S
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
Hot Water Supply Steam Supply
Detail A — Hot water supply R.H., return L.H. Detail B — Steam supply R.H., return L.H.
Detail C — Hot water supply R.H., return R.H. Detail D — Steam supply R.H., return R.H.
Detail E — Hot water supply L.H., return R.H. Detail F — Steam supply L.H., return R.H.
Figure 6: Suggested Piping Arrangements
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