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DRAIN PIPING
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Pump control range procedure
In order to control the water flow rate you must lower the
water pressure. The value of this pressure is calculated from
the difference between the value of the inlet and outlet water
pressure.
Two pressure gauges must be installed in order to obtain this
value:
1. Located after the pump (at the water outlet toward the
radiating floor circuit)
2. Located over the water inlet port (as shown in the
following figure).
The value of the water's pressure drop must be between the
minimal and maximal values of the range of the waters flow
ratio curve.
13 DRAIN PIPING
13.1. DRAIN DISCHARGING BOSS
When the base of the outdoor unit is temporarily utilized as a drain
receiver and the drain water in it is discharged, this drain boss is utilized
to connect the drain piping.
Model
DBS-26
■ Connecting procedure
1. Insert the rubber cap into the drain boss up to the extruded
portions
2. Insert the boss into the unit base and turn approximately
40 degree counterclockwise.
3. Size of the drain boss is 32 mm (O.D.)
4. A drain pipe should be field-supplied
PMML138A_R1-eng-fre.indb 34
Applicable Model
H(V)RNME
Manometer
check valve
Manometer
check valve
NOTE:
The manometers is only necessary for comissioning.
After this you can turn off
NOTE:
Do not use this drain boss set in a cold area, because the
drain water may freeze.This drain boss is not sufficient to
collect all the drain water. If collecting drain water is com-
pletely required, provide a drain-pan that is bigger than the
unit base and install it under the unit with drainage.
Drain pipe
Drain pipe
Extruded portion
Drain Boss
Rubber cap
PMML0138A-rev.1 - 11/2009
Drain hole of
Base
34
19/11/2009 14:46:00
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