Kaysun KEM-30 DNH3, Technical Manual

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=linear coefficient of thermal expansion; for steel, =6.5x10
-6
in./in
o
F(1.2x10
-5
per ); for copper,
=9.5x10
-6
in./in
o
F(1.7x10
-5
per )
In a chilled water system, the higher temperature T2 is the highest anticipated ambient temperature when
the chilled water system shuts down during summer. The lower temperature in a heating system is often the
ambient temperature at fill conditions(for example, 50
o
F or 10 ).
11.2.12 Selection and installation of the pump
(1)Select the pump
a. Select the water-flow of the pump
The rated water-flow must no less than the unit rated water-flow; in terms of multi-connect the units, that
water-flow must no less than total units’ rated water-flow.
b. Select the left of the pump.
H=h1+h2+h3+h4
H: The lift of the pump.
h1: Main unit water resistance.
h2: Pump water resistance.
h3: Water resistance of the longest water-loop distance, includes: pipe resistance, different valve’s
resistance, flexible pipe resistance, pipe elbow and three-way resistance, two-way resistance or three-way
resistance, as well as filter resistance.
H4: the longest terminal resistance.
(2) Installation the pump
a. The pump should be installed at the water inlet pipe, both of which sides must mount the soft connectors
for vibration-proof.
b. The backup pump for the system (recommended).
c. Units must with a main unit controls (Please see “4.5 fielding wiring” for the controls diagram).
11.3 Wiring Installation
All wiring installation should be done by qualified person.
11.3.1 Precautions:
1. The air-conditioner should apply special power supply, whose voltage should conform to rated voltage.
2. Wiring construction must be conducted by the professional technicians according to the labeling on the
circuit diagram.
3. Only use the electric components specified by our company, and require installation and technical
services from the manufacturer or authorized dealer. If wiring connection fails to conform to electric
installation norm, failure of the controller, electronic shock, and so on may be caused.
4. The connected fixed wires must be equipped with full switching-off devices with at least 3mm contact
separation.
5. Set leakage protective devices according to the requirements of national technical standard about electric
equipment.
6. After completing all wiring construction, conduct careful check before connecting the power supply.
7. Please carefully read the labels on the electric cabinet.
8. The user’s attempt to repair the controller is prohibited, since improper repair may cause electric shock,
damages to the controller, and so on. If the user has any requirement of repair, please contact the
maintenance center.