Toshiba HWS-803XWHM3-E Service Manual page 53

Item
8-2. 7) Boiler control
Operation Mode
The boiler assists the hot water supply operation and heating operation according to the boiler's position.
and Control
Method
7-1) Boiler setting
• TCB-PCIN3E optional P.C. board is required. Connect its connection cable to CN208 port on the PC board of the
hydro unit.
• Setting DPSW on the hydro unit: DP_SW13_2="ON/OFF" switches "Using boiler/Not using boiler (Default)".
Set the switch to "ON" when using the boiler.
• The temperature switching the boiler and heat pump: FC_23=-10°C (Default) See the next item.
The boiler output becomes effective when the outside air temperature is -10°C or less.
• Boiler position setting: DP_SW02_1="ON/OF F" must be switched in accordance with the boiler position from the
3-way valve; before the 3-way valve/after the 3-way valve and in the heating side (Default).
When the switch is set to "ON", the boiler runs in the hot water supply operations or heating operation. The action
of the 3-way valve depends on heat pump's action and the boiler follows their action.
When the switch is set to "OFF", the boiler runs in heating operation. Also, the boiler runs when the heat pump is
running for hot water supply while heating and supplying hot water simultaneously.
• Priority setting between the boiler and hydro unit: FC_3E="0/ 1 " switches the running priority; hydro unit (Default)/
boiler.
When FC_3E is set to "0" (Default), the hydro unit has priority, the boiler stops as temperature reaches the hydro
unit's temperature setting.
When FC_3E is set to "1", the boiler continues to run even after temperature reaches the hydro unit's temperature
setting. (The setting of FC_3E is effective during the HP+Boiler operation.)
• Coordination setting of the boiler and heat pump: when FC_5B="0", the boiler and heat pump runs simultaneously
(Default).
when FC_5B="1", only the boiler runs (however, if the external air temperature becomes the boiler-HP switching
temperature or more within 60 minutes, the heater may run instead for up to 60 minutes.)
when FC_5B="2", the heater runs.
*1:When FC_3E is set to "0" (Default), the hydro unit has priority, the boiler stops as temperature reaches the hydro
unit's temperature setting.
When FC_3E is set to "1", the boiler continues to run even after temperature reaches the hydro unit's
temperature setting.
<Installation example>
DP_SW02_1="OFF"(The boiler is placed after the 3-way valve and in the heating side.)
Option
Outdoor
unit
* Boiler & HP switching temp setting FC23= -10
** Boiler control/functionality setting FC5B= 0 (HP+Boiler)
*** Hot water & cooling priority setting (FC_0F="1" hot water
priority is necessary.)
DP_SW02_1="ON"(The boiler is placed before the 3-way valve.)
Outdoor
Unit
* Boiler & HP switching temp setting FC23= -10
** Boiler control/functionality setting FC5B= 0 (HP+Boiler)
*** Hot water & cooling priority setting (FC_0F="1" hot water
priority is necessary)
Operation flow and applicable data, etc.
Boiler
Hydro
Buffer
Boiler
Hydro unit
Buffer tank
HEATING
HOT WATER
HEATING & HOT
WATER
Radiator
COOLING
COOLING & HOT
WATER
HEATING
HOT WATER
HEATING & HOT
WATER
COOLING
Radiator
COOLING & HOT
WATER
52
TO<=-10* -10*<TO
Boiler + HP*** HP
HP HP
Boiler for heating
HP for hot water HP
or heating
– HP (TO 10)
HP for cooling
HP for cooling
Heater for hot
Heater for hot water***
water***
TO<=-10* -10*<TO
Boiler + HP** HP
Boiler + HP** HP
Boiler + HP** HP
– HP (TO 10)
HP for cooling
HP for cooling
Heater for hot
Heater for hot water***
water***