Toshiba MMW-AP0271LQ-E Service Manual page 17

No. Item
5 Heater control 1. While the heating themal ON, the heater relay is output by difference between
Ts and TA, and difference between Ts and TC2, Ts and TG.
2. In case of Ts
between Ts and TC2.
Ts – TC2
6 Water As the following description, the pump heater is controlled based upon the detected
Heat exchanger temperature of TC1 sensor, TCJ sensor, TF sensor, TC2 sensor, and TA sensor,
frost prevention regardless of Start/Stop operation.
1) Pump ON condition
(1) When any one of temperature of TC1 sensor, TCJ sensor, TF sensor,
(2) When TC1 < 10˚C and TCJ-TC1
2) Pump OFF condition
When all the temperature of TC1 sensor, TCJ sensor, TF sensor, TC2 sensor, and
TA sensor increased above 12˚C
3) Heater ON condition
(1) When 65 seconds progressed after the pump was OFF, TA or TC2 decreased
4) Heater OFF condition
The state TA or TC2
7 Cooling oil While the outdoor unit is recovering cooling oil (refrigerant), the hot water modules
(refrigerant) perform the following control tasks:
recovery control
1) Close the hot water module PMV to a certain degree.
2) Engage in recovery control for a specified period of time and return to stand by
at the end of this period upon terminating the control.
3) Open the SV valve throughout the recovery control period.
8 Heating While the outdoor unit is recovering heating refrigerant (oil), the hot water modules
refrigerant (oil) perform the following control tasks:
recovery control
1) Open the indoor PMV to a certain degree.
2) Control the indoor fan according to the operation mode.
Indoor units operating in heating thermo ON / OFF state]
Non-operational hot water modules]
3) Terminate the recovery operation depending on the TC2 temperature reading.
The timing of termination is determined by each indoor unit.
Start condition: A and B as shown on the right, Table 1 or Table 2
Release condition: A or B as shown on the right, Table 1 or Table 2
(˚C)
P1
Q1
45˚C, the heater relay is output as shown below by the difference
Ts 46˚C
1.5
–0.5
TC2 sensor or TA sensor decreased below 5˚C
below 15˚C
15˚C continued for 2 minutes or more.
Specification
Table 1
P1
Q1
Heater : ON
Table 2
Ts – TC2
Heater OFF
P1
Q1
Heater : ON
Heater OFF
5˚C
– 17 –
Ts:
TC2: Water outlet
TG: Satisfaction
Ts – TA Ts – TC2
(A) (B)
7˚C 2˚C
5˚C 0˚C
Ts – TG
(A) (B)
2˚C –11˚C
0˚C –14˚C
TC1: Gas Temperature
TCJ: Liquid
(TF) Temperature
• Recovery operation
normally takes place
roughly every 2 hours.
• Recovery operation
normally takes place
roughly every hour.
• The opening position
of the hot water
module PMV
depending on
capacity of the hot
water modules.
Remarks
Temperature
setting
temperature
temperature of
discharge
pressure