Principal Parts And Functions - Mitsubishi Electric City Multi PQHY-P72 Service Handbook

[2] Principal Parts and Functions

1. Heat source unit
(1) PQHY
Part Symbols
name (functions)
Compres- MC1
sor (Comp1)
High 63HS
pressure
sensor
Low 63LS
pressure
sensor
Pressure 63H1
switch
Notes Usage
Adjusts the amount of circulating
refrigerant by adjusting the oper-
ating frequency based on the op-
erating pressure data
1. Detects high pressure
2. Regulates frequency and pro-
vides high-pressure protection
1. Detects low pressure
2. Provides low-pressure protec-
tion
1. Detects high pressure
2. Provides high-pressure pro-
tection
- 109 -
[ VI Refrigerant Circuit ]
Specifications
Low-pressure shell scroll
compressor
Wirewound resistance
10°C[50°F] :0 .155ohm
20°C[68°F] : 0.161ohm
30°C[86°F] : 0.167ohm
Pressure
63HS
0~4.15 MPa [601psi]
Vout 0.5~3.5V
1 2 3
0.071V/0.098 MPa [14psi]
Pressure [MPa]
Con-
=1.38 x Vout [V]-0.69
nector
Pressure [psi]
=(1.38 x Vout [V] - 0.69) x 145
GND (Black)
1
2
Vout (White)
3
Vcc (DC5V) (Red)
Pressure
63LS
0~1.7 MPa [247psi]
Vout 0.5~3.5V
1 2 3
0.173V/0.098 MPa [14psi]
Pressure [MPa]
Con-
=0.566 x Vout [V] - 0.283
nector
Pressure [psi]
=(0.566 x Vout [V] - 0.283) x 145
GND (Black)
1
2
Vout (White)
3
Vcc (DC5V) (Red)
4.15MPa[601psi] OFF setting
Check
method