Carrier 30AWH004HB Service Manual page 118

N° Remarks Work procedure (IMPORTANT: Ensure gloves are
worn at all times to avoid risk of injury)
(19) Flow
1. Perform works from 1 to 4 of (1) and (2).
switch
2. Remove the relative connector
3. Remove the flow switch.
CAUTION:
The flow switch connection uses an O ring for water
water leakage may occur.
Place a flow sensor parallel to the water heat
exchanger inlet pipe so that the wire is place on the
right side from the front view.
(20) Water 1. Perform works from 1 to 4 of (1) and (2).
heat 2. Disconnect all the power source cable, unit connec-
exchanger tion cable, and cylinder connection cable.
(BPHE) 3. Discharge refrigerant gas.
the water circuit
5. Remove refrigerant pipes connected to the com-
pressor with a burner.
CAUTION
Ensure flames of burner do not damage PMV. (If
doing so, a malfunction may be caused.)
the heat exchanger cover.
IMPORTANT:
After the water heat exchanger replacement repair,
open the water supply source valve and water
piping source valve to pass water through the hydro
unit, and check that the connection has no water
leakage.
After connecting the refrigerant pipe, check that the
connection has no refrigerant leakage.
(21) TWI sensor
1. Perform works from 1 to 4 of (1) and (2).
TWO
2. Take the sensors out.
sensor
(22) Pump
(Only H
versions)
1. Perform works from 1 to 4 of (1) and (2).
2. Remove the relative connectors
3. Remove the 2 nuts of the heater connection and the
lower side of the pump.
4. Remove the pump pulling it out.
CAUTION:
The pump connection uses a liquid packing for
water seal. When replacing the pump, use a
packing which was slathered with the liquid gasket.
IMPORTANT:
After the pump replacement repair, open the water
supply source valve and water piping valve to pass
water through the hydro unit, and check that the
pump connection has no water leakage.
SM_30AW.indd 118
Remarks
Flow switch
BPHE
Heat exchanger cover
Water pump motor
118
Water pump
Nuts Nuts
30AW
14-03-2011 14:46:59