Nortek P7RF-K Series, Installation Instructions Manual

Page: 7 / 20

7
Grounding
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code (ANSI/NFPA 70) or CSA C22.1 Electrical Code.
Ground the air conditioning unit using the green grounding screw
provided in the control panel.
Overcurrent Protection
Generally, the best fuse or breaker for any air conditioner is the
smallest size that will permit the equipment to run under normal
usage and provide maximum equipment protection. Properly
sized fuses and breakers also prevent nuisance trips during unit
startup. If a fuse blows or a breaker trips, always determine
the reason. Do not arbitrarily install a larger fuse or breaker
and do not, in any case, exceed the maximum size listed
on the data label of the unit.
Thermostat / Low Voltage Connections
• These units are designed to operate with a 24 VAC Class
II control circuit. The control circuit wiring must comply with
the current provisions of the NEC (ANSI/NFPA 70) and
with applicable local codes having jurisdiction. Thermostat
connections should be made in accordance with the
instructions supplied with the thermostat and the indoor
equipment.
• The low voltage wires must be properly connected. Route 24V
control wires through the sealing grommet near the power
entrance. See Figure 7 (page 6) . Connect the control wires
to the defrost board and blower relay wire. Recommended
wire gauge and wire lengths for typical thermostat connections
are listed in Table 2 .
• Single stage or two-stage heating thermostats can be used with
this equipment depending on optional accessories installed
with the unit. Select a thermostat that operates in conjunction
with the installed accessories.
• The thermostat should be mounted about 5 feet above the
floor on an inside wall. DO NOT install the thermostat on an
outside wall or any other location where its operation may be
adversely affected by radiant heat from fireplaces, sunlight, or
lighting fixtures, and convective heat from warm air registers or
electrical appliances. Refer to the thermostat manufacturer’s
instruction sheet for detailed mounting information.
• The 16 SEER air conditioner uses a special two speed
compressor to achieve a high level of efficiency in a compact
frame. For the highest efficiency, the use of a 2-stage Heat /
Cool thermostat should be used with this unit. The heat / cool
thermostat prevents simultaneous operation of the heating
and cooling units and is equipped with an ON-AUTO fan mode
that allows the home owner to operate the indoor blower when
only air circulation is desired.
Heat / Cool Thermostat
A 2 stage Cooling thermostat is recommended for this product. A
single or two stage heating thermostat may be used depending on
the optional accessories installed with the unit. Install a thermostat
that operates in conjunction with the installed accessories. See
Figure 13 (page 13) for Heat / Cool applications
Table 3. CFM & Heat Rise Data
HEAT RISE DATA (BASED ON NOMINAL 10KW ELECTRIC HEAT KIT)
MODEL
P7RF-
BLOWER
SETTING
EXTERNAL STATIC PRESSURE DROP - INCHES WATER COLUMN
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CFM HEAT
RISE CFM
HEAT
RISE CFM
HEAT
RISE CFM
HEAT
RISE CFM
HEAT
RISE CFM
HEAT
RISE CFM
HEAT
RISE CFM
HEAT
RISE
X24K
Tap T1* 467 68 443 71 417 76 343 92 272 116 — — — — — —
Tap T2** 872 36 828 38 795 40 740 43 689 46 628 50 580 54 534 59
Tap T3*** 1115 28 1079 29 1043 30 1006 31 964 33 916 34 866 36 819 39
Tap T4 1244 25 1207 26 1173 27 1136 28 1102 29 1064 30 1011 31 965 33
Tap T5 1496 21 1465 22 1437 22 1407 22 1370 23 1331 24 1295 24 1257 25
X36K
Tap T1* 900 35 865 37 818 39 767 41 696 45 646 49 592 53 547 58
Tap T2*** 1131 28 1096 29 1058 30 1021 31 968 33 916 34 858 37 792 40
Tap T3** 1344 24 1313 24 1270 25 1231 26 1197 26 1156 27 1106 29 1046 30
Tap T4 1507 21 1475 21 1441 22 1401 23 1362 23 1326 24 1281 25 1230 26
Tap T5 1602 20 1570 20 1533 21 1501 21 1463 22 1418 22 1383 23 1336 24
X48K
Tap T1* 1062 30 1023 31 985 32 956 33 921 34 860 37 813 39 766 41
Tap T2*** 1079 29 1039 30 1006 31 969 33 927 34 870 36 842 38 777 41
Tap T3 1398 23 1356 23 1317 24 1277 25 1238 26 1200 26 1160 27 1115 28
Tap T4** 1654 19 1623 19 1572 20 1542 20 1509 21 1468 22 1428 22 1394 23
Tap T5 1982 16 1955 16 1921 16 1881 17 1851 17 1812 17 1782 18 1741 18
X60KA
Tap T1*** 1079 29 1039 30 1006 31 969 33 927 34 870 36 842 38 777 41
Tap T2* 1238 26 1216 26 1181 27 1135 28 1099 29 1057 30 1023 31 964 33
Tap T3 1610 20 1582 20 1551 20 1514 21 1475 21 1449 22 1412 22 1372 23
Tap T4** 1827 17 1794 18 1773 18 1741 18 1694 19 1657 19 1624 19 1583 20
Tap T5 2059 15 2026 16 1998 16 1960 16 1933 16 1901 17 1856 17 1827 17
* Denotes factory set Low COOL speed
** Denotes factory set High COOL speed
*** Denotes factory set electric HEAT speed
NOTE: Temperature rises shaded grey are for reference only. These
conditions are not recommended.