SECTION 7 – MAINTENANCE
FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018
149
JOHNSON CONTROLS
Figure 69 -
Chilled/Hot Water and Cooling Water System Evaporator Heating
If the chiller-heater needs to be stored long-term, the storage method
varies. A lot depends on the machine room temperature
condition and the storage period. If the machine room temperature is below 32°F (0°C), dra
in off the chilled/hot, and cooling
water. Dry the tube interiors. Make sure all equipment is completely dry.
Nitrogen gas pressurization inside the absorption chiller-heater is required when the storage period exceeds 6 months. Contact
your local Johnson Controls Service Center for more details.
There are two storage methods available for the chiller-heater during off-season (winter) or plant suspension; the wet storage
method and the dry storage method. The wet storage method is available only where heat source water and hot water will not
freeze.
Each storage method has its own characteristics. Select the method to use based on the plant’s features and the storage
period.
DANGER: The chiller-heater is not explosion proof. Highly flammable items, gas, or
liquids should not be handled or stored near the chiller-heater. Failure to do this may
result in explosion, injury, or damage to the equipment and/or building.
LD20185
①
②
③
④
Control Panel
P
P
P
T
T
T
T
M
Power Supply/Instrumenta-
tion (for remote monitoring)
Telephone
line
Drain from
Chiller-Heater,
Purge, and Safety
Valve
Drainage
Equipment
Drain Vent
Circulating
Header
Replenishment
Water
Expansion Tank
Chilled / Hot Water Pump
Install the pump at the high pressure
side of the absorption chiller heater
Cooling
Tower
Blow Valve
Replenishment W
a
ter
Cooling Water Pump
Outside Scope of Delivery
Three-Way Valve
Tapping for Chemical
Cleaning
Flue Gas
High Temperature Generator
Absorption
Chiller-Heater
Flow Meter
Within Scope of Delivery
Outside Scope of Delivery
Fuel
Tapping for
Chemical Cleaning Air Vent
