Work Procedure; Dry Storage; Figure 61 - Wet Storage During Heating Operation Period - York EX Series Installation, Operation & Maintenance Instructions Manual

SECTION 7 – MAINTENANCE
Open/close signal for three way valve
Thermometer
T
Drain valve
Close

FIGURE 61 - WET STORAGE DURING HEATING OPERATION PERIOD

Work Procedure

1. If the quality of the remaining cooling water is
deteriorated, drain all the cooling water from the
absorber and the Condenser.
2. Flow clean water from a higher location than the
chiller-heater. Then feed the clean water continu-
ously and clean the tubes well.
3. Fill the absorber and the condenser with clean wa-
ter.
4. Circulate the clean water with the cooling water
pump for 30 min. to 1 hour.
5. Drain all of the cooling water from the Absorber
and Condenser.
6. Fill the absorber and condenser with clean water.
7. Keep this condition during heating operation pe-
riod.
158
Cooling
Tower
Open slightly
Chiller-Heater
Start/stop signal for cooling tower fan
Thermometer
T
Strainer
Drain valve
Close

Dry Storage

Dry storage involves draining the water from the tubes.
It most often used when the unit is installed in an out-
door location.
. Condition around the chiller-heater:
• During the heating operation period, there is con-
cern of cooling water freezing.
• Cooling tower is installed at the same level
(height) of the chiller-heater.
• Lining pipe is used for the cooling water piping
system.
Do NOT leave the tubes in absorber and
condenser as is after simply draining the
remained cooling water. If you do, the heat
transfer tubes will be at high risk of corro-
sion and rusty water (red rust) generation.
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
Close
P
Cooling water pump
Filled with water
LD20942
JOHNSON CONTROLS