– 17 –
No.
Item
Specification
Remarks
5
Heater control
Ts: Temperature
setting
TC2: Water outlet
temperature
TG: Satisfaction
temperature of
discharge
pressure
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
>
45˚C, the heater relay is output as shown below by the difference
between Ts and TC2.
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
Table 1
6
Water
Heat exchanger
frost prevention
As the following description, the pump heater is controlled based upon the detected
temperature of TC1 sensor, TCJ sensor, TF sensor, TC2 sensor, and TA sensor,
regardless of Start/Stop operation.
1) Pump ON condition
(1) When any one of temperature of TC1 sensor, TCJ sensor, TF sensor,
TC2 sensor or TA sensor decreased below 5˚C
(2) When TC1 < 10˚C and TCJ-TC1
≥
5˚C
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
below 15˚C
4) Heater OFF condition
The state TA or TC2
≥
15˚C continued for 2 minutes or more.
TC1: Gas Temperature
TCJ: Liquid
(TF) Temperature
7
Cooling oil
(refrigerant)
recovery control
• Recovery operation
normally takes place
roughly 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 terminating the control.
3) Open the SV valve throughout the recovery control period.
8
Heating
refrigerant (oil)
recovery control
• 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.
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) 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.
(˚C)
Ts – TA
(A)
Ts – TC2
(B)
P1
Q1
Heater : ON
Heater OFF
Ts – TC2
1.5
–0.5
Heater : ON
Heater OFF
∗
Ts
≥
46˚C
P1
7˚C
2˚C
Q1
5˚C
0˚C
Table 2
Ts – TC2
(A)
Ts – TG
(B)
P1
2˚C
–11˚C
Q1
0˚C
–14˚C
