Installation Of The Option Kit On The Domestic Hot Water Tank; Piping Requirements - Daikin EKHWSU150B3V3 Installation Manual

Installation of the option kit on the domestic hot water tank

All pipework and fittings must be flushed free of all flux and debris prior to the fitting of controls of this option kit. Failure to do this

may cause irreparable damage to the controls. Flush the system by opening the hot water tap.
All cautions as under chapter "Installation of the EKHWSU domestic hot water tank" on page 2 remain of extreme importance and

are equally valid in this chapter.
4
H

Piping requirements

 Tundish
The tundish should be vertical, located in the same space as the
domestic hot water tank and be fitted as close as possible to, but
lower than the temperature and pressure relief valve on the
domestic hot water tank and the expansion relief valve included
in the option kit, with no more than 600 mm of pipe between the
valve outlet and the tundish. The tundish must be visible.
Tundish pipework

Tundish pipework must be 22 mm metal pipe with a minimum
vertical length of 300 mm below the tundish before any elbows
or bends in the pipework. All pipework must have a continuous
fall of at least 1 in 200 thereafter. Maximum permitted
(equivalent) length of 22 mm pipework is 9 m. Each bend or
elbow is equivalent to 0.8 m of pipework.
Installation manual
9
6
60 0 m m
D1
10
60 0 m m
6
EKUHW2WB
12
12
F
6
6
R
5
C

D1
9
2
8
D2
11
7
13
Sizing of copper discharge pipe D2 for common temperature
relief valve outlet sizes
Valve Discharge
outlet Discharge pipe size D2
size pipe size D1 from tundish
15 mm 15 mm 22 mm
(a) The maximum allowed resistance is expressed as a length of straight pipe
(i.e. no ellbows or bends)
Requirements to discharges
 Discharge piping, tundish, drain valves, etc. must be
positioned away from any electrical components.
 The discharge pipe away from the tundish must terminate in
a safe, visible position without forming any risk to persons in
the vicinity.
If in any doubt, refer to Building Regulation G3.
Do not install any valves between the domestic hot
water tank and relief valves/expansion vessel.
EKUHWBB + EKUHW2WB + EKHWSU150-300B3V3
Domestic hot water tank with option kit for air to water heat pump
3
Fixed grating
Trapped
effluent water
Resistance
created by
Maximum each elbow
(a)
resistance or bend
up to 9 m 0.8 m
system
4P344370-1B – 2019.08