Small Hvac System; Removal; Installation - PREVOST H3-41 Maintenance Manual

SECTION 22: HEATING AND AIR CONDITIONING
FIGURE 61: PUMP LOCATION – X3 SERIES
(CENTRAL A/C)
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FIGURE 62: WATER CIRCULATING PUMP (CENTRAL
A/C)
4.13.2

Small HVAC System

Water circulating pump which is located on the
ceiling of the spare
(Figure 63)
The water circulating pump consists of a
centrifugal pump and an electric motor which are
mounted in a compact assembly.
The seal-less/brushless
periodic maintenance. The pump motor is not
repairable but can be separated from the
impeller housing. In case of pump impeller
failure, refer to Ametek 18 GPM Seal-Less
ECDC Water Circulating Pump manual for
repair. Inspection of the pump, to determine if
the pump is working properly, should be made
while the pump is in operation.
If there is evidence that the pump is not
operating as per specifications, the unit must be
44 PA1621 Maintenance Manual All Series | Revised February 2019
wheel compartment
pump requires no
disassembled for repair (impeller assembly
only).
NOTE
For complete information on seal-less water
circulating pump, refer to Ametek 18 GPM
Seal-Less ECDC Water Circulating Pump
manual. Take note that the motor described in
this manual is different from the one installed
on your circulating pump which is not
repairable.
FIGURE 63: HOT WATER CIRCULATING PUMP
INSTALLATION (SMALL HVAC SYSTEM)
4.13.3

Removal

1. Stop engine and allow engine coolant to
cool.
2. Close shutoff valves on the heater line.
Refer to Figure 77 ou Figure 78 in this
section to gain access to the heater line
shutoff valve.
3. Disconnect the electrical wiring from the
motor.
WARNING
Before proceeding with the following steps,
check that coolant has cooled down.
4. Disconnect water lines from the pump at the
fittings.
5. Remove the two clamps holding the pump
motor to its mounting bracket. Remove the
pump with the motor as an assembly.
4.13.4

Installation

1. Connect water lines to the pump. Position
the pump and motor assembly on the
mounting bracket. Position the mounting
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