1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. CITY MULTI PQRY-P72-336ZLMU-A1
  6. Data book

Mitsubishi Electric CITY MULTI PQRY-P72-336ZLMU-A1 Data Book page 73

Hide thumbs
Table of Contents
8. SYSTEM DESIGN GUIDE
5) Practical System Examples and Circulation Water Control
Since the water heat source CITY MULTI is of water heat source system, versatile systems can be constituted by
combining it with various heat sources.
The practical system examples are given below.
Either cooling or heating operation can be performed if the inlet water temperature of the water heat source CITY MULTI
stays within a range of 10~45°C [50~113°F]. However, the inlet water temperature near 30°C [86°F] for cooling and 20°C
[68°F] for heating is recommended by taking the life, power consumption and capacity of the air conditioning units into
consideration. The detail of the control is also shown below.
Example-1 Combination of closed type cooling tower and hot water heat storage tank (using underground hollow slab)
Cooling water pump
By detecting the inlet water temperature of the water heat source CITY MULTI system with T1 (around 30°C [86°F])
and T2 (around 20°C [68°F]), the temperature will be controlled by opening/closing V1 in the summer and V2 in the
winter.
In the summer, as the inlet water temperature rises exceeding the set temperature of T1, the bypass port of V1 will
open to lower the inlet water temperature. While in the winter, as the inlet water temperature drops, V2 will open
following the command of T2 to rise the inlet water temperature.
The water inside the heat storage tank will be heated by the auxiliary heat source by V3 being opened with timer
operation in the night-time. The electric heater of the auxiliary heat source will be controlled by T3 and the timer.
The start/stop control of the fan and pump of the closed type cooling tower is applied with the step control of the fan
and pump following the command of the auxiliary switch XS of V1, that operates only the fan at the light load while the
fan and pump at the maximum load thus controlling water temperature and saving motor power.
MEES21K047
Closed type
cooling tower
T1~T4 : Thermostat
V1~V2 : Proportional type
motor-driven 3-way valve
V3
: Motor-driven 3-way valve
XS
: Auxiliary switch
MG
: Magnetic switch
EH
: Electric heater
Expansion tank
Circulation
water pump
V1
XS
T1
Heat
source
unit
Heat exchanger
(closed type)
Heat storage
tank pump
Heat storage tank
WR2-Series-575V
T2
V2
EH
MG
T4
V3
Auxiliary
heat source
T3
71
Show Quick Links

Hide quick links:

Table of Contents
loading

Related Manuals for Mitsubishi Electric CITY MULTI PQRY-P72-336ZLMU-A1

Related Products for Mitsubishi Electric CITY MULTI PQRY-P72-336ZLMU-A1

This manual is also suitable for:

City multi pqry-p72-336zslmu-a1City multi pqry-p72zlmu-a1City multi pqry-p96zlmu-a1City multi pqry-p120zlmu-a1City multi pqry-p144zslmu-a1City multi pqry-p168zslmu-a1 ... Show all

Table of Contents