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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
filter rack if removed during installation.
18. Verify that the unit is not in TEST mode.
19. Verify that all control components have been properly
configured and that all control components have been wired.
20. For units with WSHP Open, verify that a ZS sensor, WS
sensor, 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
All 50PC units are available with PSC blower motors. For 208V,
230V, 265V, or 460V units, the PSC motor has three speed
settings. For 575V units, the PSC motor only has one speed
setting. See Table 10 for the factory default motor setting. See
Tables 12-14 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 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
capping it.
CONSTANT TORQUE (ECM) MOTOR
The 50PC 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 five speed settings. See
Table 11 for the factory default motor setting. See Tables 12-14 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.)
YL
1
OR
2
PU
3
BL
4
BR
5
GY
9
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 50PC 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
Tables 12-14 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 Control Connec-
tions 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
Control 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.
37
P20-1-SPD1
P20-2-SPD2
P20-3-SPD3
P20-4-SPD4
P20-5-SPD5
P20-6-COM
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