Carrier AQUAZONE 50PSH, Инструкция по установке, запуску и обслуживанию

Страница: 42 / 64

42
PRE-START-UP
System Checkout
After completing the installation and before energizing unit, the
following system checks should be made prior to initial start-up:
1. Verify that the supply voltage to the heat pump is in accor -
dance with the nameplate ratings.
2. Verify that the control transformer is set to the correct voltage
for 208/230V units (factory setting is 230V).
3. Make sure that all electrical connections are tight and secure.
4. Check electrical fusing/breaker and wiring for correct size.
5. Verify that the low voltage wiring between the thermostat or
DDC controls and the unit is correct.
6. Verify that the water piping is complete and correct.
7. Verify that there are no leaks in the external piping or in the
internal unit piping. Correct as necessary.
8. Verify that the isolation or flow control valves are open and
that any automatic flow control valve or balancing valve are
set to the correct setting.
9. Check that the water flow is correct and adjust if necessary.
10. Check the blower for free rotation, and that it is secured to the
shaft.
11. Verify that the foam blower shipping support has been
removed.
12. Vertical Units Only - Verify that vibration isolation has been
provided and that the unit has been installed on a solid
structure.
13. Horizontal Units Only - Verify that the hanging brackets have
been installed and that the unit is secured to an adequate sup -
port structure.
14. Verify that the unit has proper service clearance. Be certain
that all access panels are secured in place.
15. Verify that ductwork has been properly fastened to supply
and return duct collars.
16. Verify that the ductwork is free from obstruction and that all
dampers or registers are open.
17. Make sure return air filters are positioned correctly in the fil -
ter rack if removed during installation.
18. Verify that the unit is not in TEST mode.
19. Verify that all control components have been properly config -
ured and that all control components have been wired.
20. For units with WSHP Open, verify that a ZS sensor, WS sen -
sor, Equipment Touch, or System Touch has been installed
and that a commissioning interface is available.
CLEAN AIR COIL
To obtain maximum performance, clean the air coil before starting
the unit. A ten percent solution of dishwasher detergent and water
is recommended for both sides of the coil. Rinse thoroughly with
water.
Set Blower Motor Speed
PERMANENT SPLIT CAPACITOR (PSC) MOTOR
The 50PS units sizes 07-12 are provided with PSC blower motors
with three speed settings. See Table 11 for blower performance by
speed setting.
If a motor speed change is required, follow the instructions below:
1. Disconnect power to the heat pump and follow all proper
lockout and tagout procedures to ensure that power is
removed from the unit.
2. Remove the front access cover.
3. Remove the blower speed wire from the blower relay. Clip
the 1⁄4 in. quick connect from the lead and cap the unused
lead.
4. Uncap the desired blower speed wire and terminate with
1⁄4 in. quick connect. Connect to the blower relay.
5. If the motor is a 460 V motor and the speed is changed from
high to medium or low, connect the high speed motor lead to
the orange intermediate winding lead instead of simply cap -
ping it.
CONSTANT TORQUE (ECM) MOTOR
The 50PS units from size 015 to 070 in 208V, 230V, 265V, or
460V are available with constant torque ECM blower motors.
Constant Torque ECM motors have three speed settings. See Ta -
ble 11 for blower performance by speed setting.
If a motor speed change is required, follow the instructions below:
1. Disconnect power to the heat pump and follow all proper
lockout and tagout procedures to ensure that power is
removed from the unit.
2. Remove the blower access panel and access the torque tap
wire on the motor.
3. Change the torque tap wire to on the molex plug to one of the
five speed settings. See Fig. 38.
Fig. 38 — Constant Torque ECM Pin Diagram
NOTE: Constant Torque Motors (ECM) are programmed to have
a 30s ramp up/down. Contact application engineering for details
on applications where immediate ramp down is required.
CONSTANT AIRFLOW (ECM) MOTOR
The 50PS units from size 015 to 070 in 208V, 230V, 265V, or
460V are available with a constant airflow ECM blower motor.
These motors dynamically adjust their power output to precisely
match the desired airflow on a pre-programed fan curve. See
Table 12 for Constant Airflow ECM Motor Blower performance
data. These motors include the following features:
1. Three Speed Settings : Units are factory set to "NORM"
but can be field adjusted to "+" to increase CFM by 15% or
to "–" to reduce CFM by 15%. See the constant airflow
ECM motor blower performance table for complete details
on available CFM for each unit size (refer to the Wire Con -
trol Connections section of this manual).
2.
Low CFM Ventilation:
Units circulate air at 70% of full
airflow rate when there is a call for fan only.
3. Passive Dehumidification : Reduces airflow during a cooling
call when dehumidification is also required. This reduces the
sensible heat ratio of the cooling coil and extends cooling run
time to dehumidify more effectively (refer to the Wire Con -
trol Connections section of this manual).
4.
Test Mode:
Operates the motor at a 70% torque setting. This
setting can be used to diagnose programming problems in the
motor itself (refer to the Wire Control Connections section of
this manual).
5. CFM Indicator Light : indicator light blinks for each
100 CFM of air delivered.
NOTE: This blink code is approximate and should not replace test
and balance.
P20-1-SPD1
P20-2-SPD2
P20-3-SPD3
P20-4-SPD4
P20-5-SPD5
P20-6-COM
1
2
3
4
5
9
YL
OR
PU
BL
BR
GY