Technical data

98
• Control systems
• intelligent Touch Manager • ED721208
The Reason why VRV Heat Recovery must not be Included
For Heat Recovery outdoor units, the watthour meter must be independently installed.
(1) For heat recovery, there is a case that the power consumption is less than VRV and VRV Plus.
(2) However, if different systems are put on the one meter, the electric power distribution would be calculated by constant counting, and
the calculation result would then more than the actual value on all indoor units.
Therefore, it is necessary to install the watthour meter independently as shown in Fig. 2.
In addition, the power port No. in Address Table must be different from others. (To be set at test operation)
Watthour meter with pulse output
Not allowed with 1 unit !
WHM
Power supply
three-phase
Electric energy
pulse signal line
VRV
Heat
Pump
VRV
Heat
Recovery
iTM
Fig.1 Not Recommended : Watthour meter is shared.
WHM
WHM
Power supply
three-phase
Electric
energy
pulse
signal line
Watthour meter with pulse output
VRV
Heat
Recovery
VRV
Heat
Pump
iTM
Fig.2 Recommended : Heat Recovery and other system watthour meter are separated.
Caution:
It is possible to register to the same electric power group for the following combination.
1. VRV, VRVII Heat Pump (R-22, R-407C)
2. VRV Heat Recovery (R-22, R-407C)
3. VRVII, VRVIII Heat Pump (R-410A)
4. VRVII, VRVIII Heat Recovery (R-410A)
When the combination of the above-mentioned is not observed, a correct power proportional distribution calculation cannot be done.