FIGURES AND TABLES
pinched and foam guards are in place.
16. Replace the electric heat vestibule cover removed in Step
2 and secure with screw.
17. Replace the compressor access panel.
AIRFLOW
The maximum external static pressure (ESP) for the unit is
listed on the unit rating label.
The blower speed is preset at the factory for optimum
operation in Heating and Cooling modes. It may be necessary
for some applications to change the factory set speed due
to the addition of electric heat kits. To change the blower
speed see the “Blower Speed” section in the Installation
Instructions shipped with the unit. If a lower blower speed
is desired, then the heater element high temperature limits
must be checked for proper operation. Nuisance tripping and
cycling of the limits may result with too little of airflow. Limit
operation should be checked with return air temperatures
between 72°F and 78°F. If a higher blower speed is desired
from the factory then no other testing is required.
IMPORTANT NOTE:
When installing H9HK heater kits In P7TQ Series
Table 2. Heat Rise and Range
NOMINAL
TONNAGE
UNIT
NOMINAL
KW
HEATER
KIT MODEL
HEATER KIT
PART NUMBER
BREAKERS
WIRING DIAGRAM
NUMBER
LIMIT
6-, 7.5-, 10-, and 12.5-ton
208–230V, 3PH
P7TQ(072/090/120/150-C)
9
H9HK009Q-01
1011669
NONE
Figure 14
155°F
18
H9HK018Q-11
1011672
1
Figure 16
155°F
30
H9HK030Q-21
1011675
2
Figure 18
210°F
35
H9HK035Q-21
1011678
2
Figure 18
210°F
6-, 7.5-, 10-, and 12.5-ton
460V, 3PH
P7TQ(072/090/120/150-D)
9
H9HK009S-01
1011670
NONE
Figure 15
155°F
18
H9HK018S-01
1011673
NONE
Figure 17
155°F
30
H9HK030S-01
1011676
NONE
Figure 19
210°F
35
H9HK035S-01
1011679
NONE
Figure 19
210°F
Table 3. Heater Kit Model Cross Reference
packaged units (on duct systems where the unit ESP
is greater than that marked on the unit rating label) the
heater kit may require the addition of a high static drive
kit to increase blower performance. For blower data See
the unit blower performance tables in the Installation
Instructions shipped with the unit. For accessory
description and part number info refer to the Technical
Sales litertaure.
Nominal heater kit temperature rise data shown in
Table 2
was calculated using the formula below.
Temp Rise: ΔT= (Btu/h)/(CFM*1.08)
NOTE: Generally the heat rise should be near values shown.
Anything greater than 3–5° above that shown should be
avoided.
6
CP-H9HK (05-20) 1012566-B
MODEL
NUMBER
NOMINAL
RATED CFM
TEMPERATURE RISE °F (°C)
*
9 KW
18 KW
30 KW
35 KW
P7TQ072-*
2,550
11°F (6°C)
22°F (12°C)
37°F (21°C)
43°F (24°C)
P7TQ090-*
3,150
9°F (5°C)
18°F (10°C)
30°F (17°C)
35°F (19°C)
P7TQ120-*
3,450
8°F (4°C)
16°F (9°C)
27°F (15°C)
32°F (18°C)
P7TQ150-*
4,300
7°F (4°C)
13°F (7°C)
22°F (12°C)
26°F (14°C)
*
Temperature rise calculation = rise (°F) = (kW*3413) / 1.08 / nominal CFM.
NOTE: For 208–230V electric heat kits operating @ 208 Volts, the kW rating is derated 25%, therefore temperature rise will be lower than the
values in the table.
