Toshiba MMW-UP0271LQ-E - Page 17

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No. Item Specification Remarks
6 Heater control TG: Satisfaction
temperature of
discharge
pressure
1. While the heating thermostat ON, the heater relay is output by difference between
Ts and TWI, and difference between Ts and TWO, Ts and TG.
2. In case of Ts > 45˚C, the heater relay is output as shown below by the difference
between Ts and TWO.
Heater ON condition: A and B as shown below Table 1 or Table 2
Heater OFF condition: A or B as shown below Table 1 or Table 2
Table 1
7 Water
Heat exchanger
frost prevention
As the following description, the pump and heater are controlled based upon TC1, TCJ,
TCJ2, TWO and TWI, regardless of Start/Stop operation.
1) Pump ON condition
(1) When any one of TC1, TCJ, TCJ2, TWO or TWI became below 5˚C
(2) When TC1 < 10˚C and TCJ - TC1 ≥ 5˚C
2) Pump OFF condition
When all of TC1, TCJ, TCJ2, TWO and TWI became above 12˚C
3) Heater ON condition
When TWI or TWO became below 15˚C after the pump was OFF and 65 seconds
progressed.
4) Heater OFF condition
TWI or TWO ≥ 15˚C continued for 2 minutes.
TC1: Gas Temperature
TCJ: Liquid
Temperature
TCJ2: Liquid
Temperature
8 Cooling oil
(refrigerant)
recovery control
• Recovery operation
normally takes place
r
oughly every 2 hours.
While the outdoor unit is recovering cooling oil (refrigerant), the hot water modules
perform the following control tasks:
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 completing the control.
3) Open the SV valve throughout the recovery control period.
9 Heating
refrigerant (oil)
recovery control
• Recovery operation
normally takes place
roughly every hour.
• The opening position
of the hot water
module PMV
depends on capacity
of the hot water
modules.
While the outdoor unit is recovering heating refrigerant (oil), the hot water modules
perform the following control tasks:
1) Open the indoor PMV to a certain degree.
2) Complete the recovery operation depending on the TWO.
The time to complete is determined by each indoor unit.
(˚C)
Ts – TWI
(A)
Ts – TWO
(B)
P1
Q1
Heater : ON
Heater OFF
Ts – TWO
1.5
–0.5
Heater : ON
Heater OFF
∗
Ts ≥ 46˚C
P1 7˚C 2˚C
Q1 5˚C 0˚C
Table 2
Ts – TWO
(A)
Ts – TG
(B)
P1 2˚C –11˚C
Q1 0˚C –14˚C