Water Connections; Flow Control; Condenser Connections - Carrier Pro-Dialog Plus 30HZ Installation, Operation And Maintenance Instructions

6.2 - Water connections

This diagram shows a typical water installation.
Typical water circuit diagram
2
1
9
12
10
11
legend
1 Control valve
2 Air vent
3 Flow switch for the evaporator
4 Flexible connection
5 Heat exchanger
6 Pressure tap
7 Thermostat sleeve
8 Drain
9 Buffer tank
10 Filter (mesh size: 1.2 mm = 20 mesh)
11 Expansion tank
12 Fill valve

6.3 - Flow control

6.3.1 - evaporator flow switch and chilled water pump
interlock
IMPORTANT: On 30hZ/hZV units, the unit chilled
water flow switch must be energised, and the chilled water
pump interlock must be connected. failure to follow this
instruction will void the Carrier guarantee.
The flow switch is supplied, installed on the evaporator
entering water pipe and factory-set to the minimum water
flow rate. If adjustment is necessary:
1. Switch on the unit. Set it to constant flow (preset value).
The yellow LED is illuminated, and the output is
switched for approximately 20 seconds (power-on
delay time).
2. Turn the potentiometer until one green LED is illumi-
nated. The further the green LED is from the yellow
LED, the safer the adjustment (standby capacity in
case of flow or temperature fluctuations).
3. After the adjustment attach the label supplied to the
potentiometer, in order to protect it against unautho-
rised tampering.
Terminals 34 and 35 are provided for field installation of the
chilled water pump interlock (auxiliary contact for pump
operation to be wired on site).
5
4
3
6
8
7
Potentiometer adjustment
1
legend
1 Setting potentiometer sensitivity
2 Chain of LEDs
- red LED lights: the unit is not adjusted
- yellow LED lights: the output is switched
- green LED lights: the unit is adjusted

6.4 - Condenser connections

The condenser is of the multi-tube shell and tube type with
removable water boxes to facilitate cleaning of the tubes.
6.4.1 - before making water connections
Tighten the bolts in both heads to the lower torque shown,
following the method described. Tighten in the pairs and
sequence indicated according to the size of bolt (see below)
using a torque value at the low end of the range given.
Water box tightening sequence
7
4
6
Sequence 1: 1 2 3 4
Sequence 2: 5 6 7 8
Bolt size M12 - 71-87 Nm
Bolt size M16 - 171-210 Nm
Bolt size M20 - 171-210 Nm
2
1
5
3
8
2
17