22
Unit must be powered to perform the following procedure. Set the
electrical multimeter to VDC. Attach black negative (–) lead of
meter to the terminal labeled “L2” (shown above the potentiome
-
ters). Attach the RED positive (+) lead of the meter to the terminal
labeled “L1” and confirm that there is approximately 5 to 10 vdc
present.
Attach the RED positive (+) lead of the meter to the DC OUT
-
PUTS. LOW, MED, and HIGH are typically connected together.
1. Close either the LOW, MED, or HIGH speed relay contacts
by applying 24 VAC to the corresponding LOW, MED or
HIGH 24 VAC INPUT and COM.
2. Measure voltage at the DC OUTPUTS and adjust the potenti
-
ometer for that speed. (VR1 LOW, VR2 MED, VR3 HIGH)
3. In order to achieve higher CFM, turn the potentiometer clock
-
wise.
NOTE: For specific voltages adjustment please contact Carrier
factory representative.
When the 42DH/DV unit is ordered with Proportional Control, no
control board is required, and no field adjustments are possible.
Motor uses a 0-10 VDC signal directly. See control box label. Fan
enabled at 1.5 VDC. Turning the voltage past the setting for high
speed may introduce the risk of condensate blow off.
Water Balancing System
A complete knowledge of the hydronic system, along with its
components and controls, is essential to proper water system bal
-
ancing. This procedure shall not be attempted by unqualified
personnel. The system must be complete, and all components
must be in operating condition BEFORE beginning water system
balancing operations.
Each hydronic system has different operating characteristics
depending on the devices and controls used in the system. The
actual balancing technique may vary from one system to another.
After the proper system operation is established, record the appro
-
priate system operating conditions such as various water tempera
-
tures and flow rates in a convenient place for future reference.
Before, and during water system balancing, conditions may exist
due to incorrect system pressures which may result in noticeable
water noise or undesirable valve operation. After the entire system
is balanced, these conditions will not exist on properly designed
systems.
Table 5 —
Motor Performance Data (Full Load Amps)
NOTES:
1. Motor Full Load amps refer to National Electric Code (NEC) amps;
actual motor nameplate amps may vary.
2. Motors are UL recognized, constant speed brushless DC type,
open drip proof, ball bearing, multi-voltage options, 0-10v control.
Table 6 —
Single Phase Electric Heater Availability
LEGEND
NOTES:
1. Electric Heating Capacities BTUh)=Heater kW x 3413.
2. Electric Heater Amperage for Single-phase Power = (Heater kW x
1000)/Applied Voltage.
MOTOR TYPE
VOLTAGE
42DH/DV UNIT SIZE
06, 10
08, 12, 16, 20
22
30
MOTOR HORSEPOWER AND FLA (HP)
1/2
1
1-1/2
3
1-PHASE
SINGLE SPEED
STANDARD
EFFICIENCY
115v/1-PHASE/50-60 Hz
6.40
10.70
N/A
N/A
208v/1-PHASE/50-60 Hz
3.80
6.30
N/A
N/A
230v/1-PHASE/50-60 Hz
3.60
5.80
N/A
N/A
277v/1-PHASE/50-60 Hz
3.20
5.10
N/A
N/A
3-PHASE
SINGLE SPEED
STANDARD
EFFICIENCY
208v/3-PHASE/50-60 Hz
2.00
3.70
4.4
8.9
230v/3-PHASE/50-60 Hz
1.85
3.30
4.4
8.9
460v/3-PHASE/50-60 Hz
1.00
1.75
2.2
4.4
kW
ELECTRIC HEATER AMPS
42DH/DV UNIT SIZE (HEATER STAGES)
SINGLE PHASE
(1 OR 2 STAGE)
06
08
10
12
16
20
120v
208v
240v
277v
1 stg
2 stg
1 stg
2 stg
1 stg
2 stg
1 stg
2 stg
1 stg
2 stg
1 stg
2 stg
1.0
8.3
4.8
4.2
3.6
X
—
X
—
—
—
—
—
—
—
—
—
1.5
12.5
7.2
6.3
5.4
X
—
X
—
X
—
X
—
—
—
—
—
2.0
16.7
9.6
8.3
7.2
X
—
X
—
X
—
X
—
—
—
—
—
2.5
20.8
12.0
10.4
9.0
X
—
X
—
X
—
X
—
X
—
—
—
3.0
25.0
14.4
12.5
10.8
X
X
X
X
X
X
X
X
X
X
—
—
3.5
29.2
16.8
14.6
12.6
X
X
X
X
X
X
X
X
X
X
X
X
4.0
33.3
19.2
16.7
14.4
X
X
X
X
X
X
X
X
X
X
X
X
4.5
37.5
21.6
18.8
16.2
X
X
X
X
X
X
X
X
X
X
X
X
5.0
—
24.0
20.8
18.1
X
X
X
X
X
X
X
X
X
X
X
X
6.0
—
28.8
25.0
21.7
X
X
X
X
X
X
X
X
X
X
X
X
7.0
—
33.7
29.2
25.3
—
—
X
X
X
X
X
X
X
X
X
X
8.0
—
38.5
33.3
28.9
—
—
X
X
X
X
X
X
X
X
X
X
9.9
—
—
—
35.7
—
—
—
—
X
X
X
X
X
X
X
X
12.0
—
—
—
43.3
—
—
—
—
—
—
X
X
X
X
X
X
X — Available Option
— — Not Available
