CCI Thermal Technologies AV - Advanced Vertical Unit Heater - Manuel (Page 4)

4
FIGURE 3
FIGURE 2
AH-24B Tandem
A in. 52-15/16
mm 1345
B in.
31-1/2
mm 800
C in.
4-13/16
mm 122
D in.
7-7/16
mm 189
E in.
24-3/16
mm 615
F in.
58-1/4
mm 1480
G in.
9/16
mm 14.3
H in.
36-7/8
mm 937
I in.
2-1/16
mm 53
J in.
5/8
mm 16
K in.
59-1/2
mm 1512
DIM AH-12A AH-16A AH-20A AH-24A
A in 15-13/16 19-13/16 23-13/16 27-7/8
mm 401 503 605 707
B in 19-7/16
23-1/2 27-1/2 31-1/2
mm 494 596 698 800
C in
4-3/16 4-3/16 4-3/16 4-3/16
mm 107 107 107 107
D in 7-15/16
7-9/16 7-3/16 6-7/8
mm 201 192 183 174
E in
23-5/8 23-5/8 23-5/8 23-5/8
mm 600 600 600 600
F in 18-3/16 22-3/16 26-3/16 30-3/16
mm 462 564 665 766
G in
9/16 9/16 9/16 9/16
mm 14.3 14.3 14.3 14.3
H in
23-7/8 27-7/8 31-7/8 35-7/8
mm 606.5 708.5 809.5 911.5
I in
1-9/16 1-9/16 1-9/16 1-9/16
mm 39 39 39 39
J in
5/8 5/8 5/8 5/8
mm 16 16 16 16
K in 27-1/2 31-5/8 35-1/2 39-5/8
mm 698.5 802.5 903 1005
L in.
65-1/2
mm 1662.5
MOUNTING
1. The unit heater is designed to be installed in an upright and
level position. However, it may be installed in any position
provided that for steam service the inlet is above the outlet
and the bottom of the heat exchanger drains towards the
outlet.
2. Heater cabinets are designed to be mounted from the top or
bottom using 1/2” (14 mm) bolts. For heater dimensions, see
Figure 2 for single fan or Figure 3 for 24” tandem.
3. The mounting structure must be strong enough to:
a. support the heater’s weight (refer to the specification
section),
b. provide sufficient stiffness to prevent excessive
vibration, and
c. withstand abusive situations such as transportable
installations.
4. For ease of installation, a variety of mounting kits are
available from the factory.
MOUNTING HEIGHTS
1. The base of the heater is to be elevated a minimum of 7.9
ft (2.4 m) above the floor.
2. Heaters maybe mounted at higher elevations and still
provide warm air at the floor level. The maximum elevation
at which warm air will still reach the floor depends on site
and operation conditions.
3. Louvers can be adjusted to provide greater downward
deflection of the discharge air. It is recommended that
louvers not be closed more than 75° from full open.
MOUNTING CLEARANCES
1. Leave at least 20” (500 mm) clearance between the rear of
the motor and the nearest obstruction.
2. Clearance equal to the height of the heater cabinet above,
or beneath, the cabinet is required for easy fan or motor
replacement.
TEMPERATURE CONTROL
1. If required, the unit heater’s output may be thermostatically
controlled by the following:
a. Airflow through the heat exchanger can be turned on
and off by thermostatically controlling the fan motor.
Usually the flow of the heat transfer medium is
allowed to pass through the heat exchanger without
interruption. This is the most economical method of
controlling the heater.
b. Heat transfer medium flow may be controlled by a
thermostatic valve, while allowing the fan motor to run
continuously to circulate room air.
c. Absolute control of the heater output from the heat
exchanger will require that the fan and heat transfer
medium be shut off. Such control of the heater
output is possible by a thermostatic valve control in
combination with the thermostatic fan control.
FINAL INSPECTION
1. Before application of electrical power:
a. Check that all connections are secured and comply
with the applicable wiring diagram (see Figure 7) and
code requirements.
b. Confirm the power supply is compatible with the data
plate rating on motor.
c. Remove any foreign objects from heater.
d. Ensure all electrical covers are well secured.
e. Ensure the fan rotates freely, ensure air exits through
louvers and the fan rotates counterclockwise when
viewed from the rear of the heater.