Specifications
JOHNSON CONTROLS
2-50
FORM 102.20-N1 (1109)
Installation
FIG. 2-72 – INTEGRAL FACE AND BYPASS COIL (HORIZONTAL; TUBES, STEAM SHOWN)
FACE
DAMPERS
CLOSED
BYPASS
OPEN
STEAM IN
ACTUATOR
STEAM OUT
LD09630
VIFB and IFB
A complete IOM is provided with each
IFB or VIFB coil unit.
VIFB lower header must be free to
oat. After coil has been piped, re-
move yellow colored bolts to allow
header to oat. Always “back up” on
the coil connections when installing
ttings.
VIFB Warranty will be voided should
return piping on lower header (inlet
and return on two-row header) not
include exible connector(s) and if
lower header(s) bolts are not removed
prior to use.
See IFB/VIFB manufacturer's IOM
for additional piping details.
Factory does NOT pipe connections to
unit exterior.
Below 35°F, the Vertical Tube Integral Face and Bypass
(VIFB) or Integral Face and Bypass (IFB) operates
with full steam pressure or full water ow at all times.
This prevents freeze-up and temperature stratication.
FIG. 2-73 – VERTICAL INTEGRAL FACE AND
BYPASS COIL
STEAM IN
STEAM OUT
ACTUATOR
LD09631
(FACE MOUNTED ACTUATOR SHOWN)