[
VI
Control ]
- 74 -
HWE1410A
GB
Defrost Operation Control
-7- Defrost Operation Control
(1) Defrost cycle type
The defrost cycle has following two types: Bypass defrost that is the same method as that used in a CITY MULTI series sys-
tem and heat recovery defrost (default) that the heat is collected from the water circuit and the defrost cycle ends early.
The following figure shows the refrigerant flow for the bypass defrost. In the bypass defrost method, LEV1 and 2 are closed
and the heat is not exchanged between the refrigerant and water. In the heat recovery defrost method, the defrost cycle ends
early because the heat is caught from the water.
The basic defrost method is the heat recovery defrost with the dip switch 3-10 on the HBC turned OFF (default). The bypass
defrost may be performed depending on the water temperature. Setting the dip switch 3-10 to ON performs the bypass defrost.
(2) Starting the defrost operation
The defrost cycle will start when all of the three conditions (outside temperature, cumulative compressor operation time, and
pipe temperature) under <Condition 1>, <Condition 2>, or <Condition 3> are met.
1) Outdoor unit pipe temperature (TH6)
If 10 minutes have passed since compressor startup or since the completion of a defrost cycle, a forced defrost cycle can be
started by setting DIP SW2-7 to ON.
Even if the defrost-prohibit timer is set to 90 minutes (or 150 minutes for "Condition 3" to be met), the actual defrost-prohibit
time for the next defrost cycle is 50 minutes if the last defrost cycle took 12 minutes.
S
S
Refrigerant flow
High-pressure
pipe
Low-pressure
pipe
HBC refrigerant system
HBC water system
LEV1
LEV2
SV1
HIC
T13
T15
T16
LEV3
PS1
T12
T11
T14
Water
Water
Water
Water
PS
Cooling-main
heat exchanger
Heating-main
heat exchanger
PS
S
21S4Ma
21S4Mb
Water pump WP1
Water purge
valve
Expansion
tank
Water
supply
Refrigerant Refrigerant
Refrigerant
Water pressure
protection valves
PS3
Strainer
T32
T34
Strainer
T33
Air purge valves
Water pump WP2
T35
Refrigerant
M
Condition 1
Condition 2
Condition 3
Outside temperature
(TH7)
-5ºC [23ºF] or above
-5ºC [23ºF] or below
Cumulative compressor
operation time
50 minutes or more
90 minutes or more if the defrost prohibit timer is set to 90.
250 minutes or more
Pipe temperature
(TH6)
The pipe temperature has
stayed below the temperatures
in the table below (Note1) for
three minutes.
The pipe temperature (TH6)
has stayed at or below the val-
ue obtained from the formula
"Outside temperature (TH7) -
10ºC [18ºF]" for three minutes.
or the 63LS reading has stayed
below the value obtained from
the formula "1.5 + 0.02 x
(20+TH7)" for three minutes.
The pipe temperature has
stayed below the temperatures
in the table below (Note1) for
three minutes
SW3-3 OFF
-8ºC
SW3-3 ON
-5ºC
0000002394.book 74 ページ 2016年1月12日 火曜日 午後4時49分
Содержание CITY MULTI CMB-WP1016V-GA1
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Страница 27: ... I Read Before Servicing 18 HWE1410A GB ...
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Страница 50: ... III HBC Controller Components 41 HWE1410A GB 4 Top side 1 CMB WP1016V GA1 2 CMB WP108V GA1 VB3f VB3e ...
Страница 52: ... III HBC Controller Components 43 HWE1410A GB 2 Top side 1 CMB WP1016V GB1 2 CMB WP108V GB1 VB3f VB3e ...
Страница 55: ... III HBC Controller Components 46 HWE1410A GB 2 Power supply circuit board ...
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Страница 67: ... IV Electrical Wiring Diagram 58 HWE1410A GB ...
Страница 68: ... 59 HWE1410A GB V Refrigerant Circuit 1 Refrigerant Circuit Diagram 61 2 Principal Parts and Functions 64 ...
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Страница 75: ... 66 V Refrigerant Circuit GB HWE1410A ...
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Страница 117: ... VII Test Run Mode 108 HWE1410A GB ...
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Страница 207: ... VIII Troubleshooting 198 HWE1410A GB ...
Страница 208: ... 199 HWE1410A GB IX LED Monitor Display on the Outdoor Unit Board 1 How to Read the LED on the Service Monitor 201 ...
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Страница 292: ... IX LED Monitor Display on the Heat source Unit Board 283 HWE1410A 0000002394 book 283 ページ 2016年1月12日 火曜日 午後4時49分 ...
Страница 293: ... IX LED Monitor Display on the Heat source Unit Board 284 HWE1410A 0000002394 book 284 ページ 2016年1月12日 火曜日 午後4時49分 ...
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