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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 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
All 50PC units are available with PSC blower motors. For 208V,
230V, 277V, or 460V units, the PSC motor has three speed set-
tings. For 575V units, the PSC motor only has one speed setting.
See Table 8 for the factory default motor setting. See Table 10 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 ¼ in. quick connect from the lead and cap the unused
lead.
4. Uncap the desired blower speed wire and terminate with ¼ 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 50PC units from size 015 to 070 in 208V, 230V, 277V, or
460V are available with constant torque ECM blower motors.
Constant Torque ECM motors have five speed settings. See
Table 9 for the factory default motor setting. 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 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. 23.
Fig. 23 — 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.
P20-1-SPD1
P20-2-SPD2
P20-3-SPD3
P20-4-SPD4
P20-5-SPD5
P20-6-COM
1
2
3
4
5
9
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OR
PU
BL
BR
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