Wiring For Heater - Mitsubishi Electric PAC-IF061B-E Installation And Operation Manual

4. Electrical work

4.6 Wiring for heater

<Care to be taken when connecting a booster heater(s)>
The initial setting assumes that the connected booster heater(s) has a built-in direct cut-off thermostat. <Fig. 4.6.1>
When the connected booster heater(s) has a built-in indirect cut-off thermostat, perform wiring according to the following items. < Fig. 4.6.2>
• Connect the thermostat signal to BHT (TBO.5 1-2).
• Remove the jumper wire from connector CNBHT.
• Connect a contactor (or relay) for protecting the booster heater.
(Connect the electromagnetic coil terminals to BC (TBO.5 3-4).
*
Do not remove the jumper wire from connector CNBHT when the connected booster heater(s) has a built-in direct cut-off thermostat. < Fig. 4.6.1>
<Care to be taken when connecting an immersion heater>
The initial setting assumes that the connected immersion heater has a built-in direct cut-off thermostat. <Fig. 4.6.3>
<Wiring for booster heater with a built-in direct cut-off thermostat>
Earth leakage
circuit breaker for
booster heater
Contactor or
relay for booster
heater
Direct cut-off
thermostat
Booster heater1
<Fig. 4.6.1>
<Wiring for immersion heater with a built-in direct cut-off thermostat>
Earth leakage
circuit breaker for
immersion heater
Contactor or relay
for immersion
heater
Direct cut-off
thermostat
Immersion heater
<Fig. 4.6.3>
TBO.4 3-4
TBO.5 1-2
TBO.5 3-4
TBO.5 5-6
TBO.5 7-8
OUT7
(TBO.5 7-8)
Contactor or
relay for
booster heater 2
OUT6
(TBO.5 5-6)
Booster heater2
OUT9
(TBO.4 3-4)
<Wiring for booster heater with a built-in indirect cut-off thermostat>
Earth leakage
circuit breaker for
booster heater
Contactor or relay
for protecting
booster heater
Contactor or
relay for booster
heater 1
Booster heater1
Indirect cut-off
thermostat
CNBHT
BC
(TBO.5 3-4)
Contactor or
relay for
booster heater 2
OUT6
(TBO.5 5-6)
Booster heater2
BHT
(TBO.5 1-2)
<Fig. 4.6.2>
OUT7
(TBO.5 7-8)
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