Installation/Use/Maintenance Instructions
Fan coil units VFC, installation in sills
E
LTG Incorporated · PO Box 2889 · Spartanburg, S.C. 29304, USA
VFC_USA_BA (07/19)
Phone 864 599-6340, Fax -6344 · e-mail: [email protected] · Internet: www.LTG-INC.net
Former editions are invalid · Subject to technical modifications
page 33 of 19
5.2
Water Connections
Remove the heat exchanger plugs prior
to water connection!
Units are provided with heat exchangers with copper
tubes and aluminum fins for 4-pipe operation with sepa
rate heating and cooling circuits or for 2-pipe operation.
The heat exchangers have been approved for a maximum
operating pressure of 145 psi (other pressures on
request).
Depending on the unit type, water connections are sup
plied in the following versions:
1. copper fitting with 0.5 “ outer diameter.
This connection is only suitable for flexible
connection with quick coupling.
2. 1/2” internal thread fitting, conical sealing.
Connections must be strainless.
Connecting lines must be able to
expand.
Attention:
Prior to allowing water to enter the unit
the flexible water connection hoses will
have to be checked for proper and
leakproof connection. Even though
hoses to the heat exchanger are prein
stalled, connections might have loos
ened during transport or installation of
the unit on site.
You may use off-the-shelf control valves and shut-off
valves.
When tightening the fittings, avoid damaging the heat ex
changer pipes through bending or twisting.
Pipe fittings must always be flush.
In order to adjust the water flow rate specified in the selec
tion data, a regulating device or restricting olive will be re
quired. A regulating device for each individual unit can be
provided only when the units are identical, with the same
water flow quantities and the same pressure loses, in the
case of the Tichelmann system (reverse return principle).
In this case, one regulating device for the entire line may
be sufficient. Otherwise, a regulating device will be re
quired for each heat exchanger.
If removal of a heat exchanger without draining the entire
system or a line is a requirement, 2 or 4 shut-off valves will
have to be provided for each unit. You may use off-the-
shelf shut-off valves.
The unit fitting will only be provided with an integrated
vent if specifically asked for. The water speed inside the
heat exchanger is usually sufficient to carry along air bub
bles and one ventilation device per line is therefore appro
priate. In a case of emergency, the line may be ventilated
by slightly loosening the standard fitting of the unit.
Included in the unit price and provided with the unit (un
less special fittings such as transitions, straight-way or
angle valves or hose connections are ordered) is a com
plete compression fitting for unit-side water connection,
appropriate to take copper pipes with a 0.5 “ outer diame
ter, wall thickness of 0.03 “…0.04 “, suitable for connecting
hoses. The union nut is fixed to the heat exchanger pipe's
flared end, while olive and banjo bolt will be delivered in
packs of 2 or 4 - according to type of unit - in a bag attached
to the unit.
Due to possible condensation, the connections to the heat
exchanger for cooling should be insulated, e.g. using Ar
maflex insulation.
