Table of Contents
Advertisement
SECTION 28 - HEAT RECOVERY
Setpoints
• Hot Water Control setpoint – (Extended temp
range equals 65.0°F to 125.0°F; default 95.0)
(Standard temp range equals 65.0°F to 112°F;
default 95.0) Sets the temperature that the Leav-
ing Heating Condenser Water Temperature will
be controlled to Displayed as Active Hot Water
setpoint.
MICROBOARD
031-02430-000
031-02430-001
RS-485
J14
COM 3
10
11
OUT
+5V
HEATING CONDENSER
FLOW SWITCH -
THERMAL TYPE
NOTE 2
LEAVING HEATING
CONDENSER WATER
THERMISTOR
RETURN HEATING
CONDENSER WATER
THERMISTOR
REMOTE HOT WATER
SETPOINT
0-10VDC or 4-20mA
HEATING CONDENSER
WATER FLOW SWITCH
120VAC
NOTE 2
NOTES:
1. If Head Pressure Control is ENABLED and Hot Water Control is DISABLED or if Hot Water Control is ENABLED
but there is NO water flow in the heating condenser, valve control will automatically switch over to the Head Pressure Control.
2. The chiller could be equipped with either paddle/differential pressure (120VAC) type or Thermal Type (+5VDC) flow
switches. Each Type must be connected as shown.
FIGURE 92 - HEAT RECOVERY BLOCK DIAGRAM
238
J12
J9
2
4/12
3
3/11
J10
2
1
5
4
TB9
3
4
TB20
1
2
JCI COMPANY CONFIDENTIAL
I/O
BOARD
031-02895-000
TB2
POSITIONING
(-)
AO2
2
(+)
GND
3
TB1
AO1
2
GND
3
AI1
5VDC
AI2
5VDC
AI8
GND
DI1+
DI1-
FORM 160.54-M1
ISSUE DATE: 10/25/2019
VALVE
HEAT RECOVERY
CONTROL VALVE
0-10VDC or 4-20mA
NOTE 1
HOT GAS BYPASS
CONTROL VALVE
0-10VDC
JOHNSON CONTROLS
LD14238
Advertisement
Table of Contents
