Table of Contents
Advertisement
DISASSEMBLY PROCEDURE
8. How to remove the booster heater
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CNBHT connector and the THW3
connector on the controller board, and the 4 booster
heater lead wires wired to the BHC1 and BHC2
contactors and release the lead wires from the 7 bands
and the 2 cable straps. (Photos 8-1, 10-1, 10-2)
w THW3 will be used later.
(4) Close (OFF) the pump valve (lower) to stop flow. (Photo
8-2)
(5) Remove the two 1" nuts. (Photo 8-3)
w When reinstalling the 1" nuts, use new 1" gaskets.
(6) Remove the flare nut using two spanners: one to hold
the flare joint and the other to turn the flare nut.
(Photo 8-3)
(7) Remove the two screws on the heater stay. Lift the
booster heater slightly and remove the booster heater
from the heater stay. (Photo 8-4)
(8) Remove the flare joint from the booster heater.
(Photo 8-3)
w When reinstalling the flare joint, use a new 3/8" gas-
ket.
(9) Remove the drain cock from the booster heater.
(Photo 8-3)
w Replace the removed drain cock (primary circuit).
The reused drain cock could cause water leakage.
(10) Remove the THW3 thermistor from the booster heater.
(Refer to Procedure 20. )
Photo 8-4
PHOTOS
Control box
Photo 8-1
Controller
board
CNBHT
connector
THW3
connector
Terminal block (TB1)
w The photos shown are of the EHST20C-VM6HA model.
Photo 8-2
Photo 8-3
Booster
heater
6
Earth leakage breakers
(ECB1, ECB2)
Contactors
Pump valve
handle (lower)
Pump valve
(lower)
Flare nut
Flare joint
Gasket (3/8")
Nut (1")
Gasket (1")
Screw
Heater stay
Nut (1")
Screw
Gasket(1")
Drain cock
Hide quick links:
Advertisement
Table of Contents
