Carrier 28QX - Manual (Page 20)

Step 6 — Make Electrical Connections — Field
wiring must comply with local and national fire,
safety and electrical codes. Voltage to units must
be within ± 10% of voltage indicated on nameplate.
Operation of unit on improper line voltage
constitutes abuse and is not covered by Carrier
warranty.
Electrical data for pump packages including
wire and fuse sizes are shown in Table 3. See 38HQ
and 40FS unit Installation Instructions for similar
electrical data. All line and control power wiring
connections for the Solaround"'''^ System are
shown in this booklet. Refer to Pump Package
label wiring diagram, Fig. 25 and 26 and typical
system wiring schematic. Fig. 27. Be sure ther­
mistor sensors are wired to terminals in pump
package control box.
INSTALF BRANCH CIRCUIT FUSED DIS­
CONNECTS of adequate size to handle unit
starting current. Provide a separate fused dis­
connect for each of the following; pump package,
compressor section, indoor fan coil and outdoor
coil section. Locate disconnects within sight of and
readily accessible from the unit, per section 440-14
of National Electrical Code (NEC).
Be sure all ground leads are connected to
grounding lugs provided on units.
CONTROL POWER (24 v) is supplied by indoor
fan coil with 60-va transformer. On 40FQ-25 and
30 kw electric heaters, remove 60-va transformer
and replace with 75-va transformer available from
C a r r i e r S e r v i c e P a r t s C e n t e r (Part No.
HT01BD235).
Use C a r r i e r accessory room thermostat
H H 0 7 A T 0 7 1 w i t h t h e r m o s t a t s u b b a s e
HH93AZ069 for proper unit operation.
Warning Logic (WL) Control Wiring Modification -
Locate WL control in 38HQ compressor section
control box. Move black wire (extended from
low-pressure switch) from WL terminal 2 to WL
terminal 3. This prevents heat pump unit from
restarting when it is shut off by a safety control,
and service is required. The heat pump cannot
restart until thermostat is reset. For instance, if the
heat pump is shut off by 28QX coil freeze
protector, the WL signals a system malfunction by
illuminating a warning light on wall thermostat.
The freeze protector was activated by indoor fan
failure or low refrigerant charge. Either condition
warrants unit servicing before thermostat is reset
and unit is restarted.
Tri-X Coil Wiring — Splice connect 3 wiring leads
to pigtails on 28QX coil freeze-protector (Fig. 25,
26, 27). Use wire nuts and 16 AWG wire (up to
150 ft). Connect leads to pump package terminal
board one.
Thermistor Sensor Wiring — Connect wires from
thermistor on storage tank, and collector panel, to
barrier strip terminals provided on pump package
controller. Use 18 AWG wire for lengths up to
50 ft; 14 AWG wire for lengths up to 250 ft. Use
wire nuts for pigtail connections on thermistors.
Table 3 — Electrical Data (60-Hz)
PUMP
PACKAGE
34WA167
34WA257
34WA367
34GL167
34GL257
34GL367
OPER BRANCI■1 CIRCUIT
V/PH VO LT* Power Wire Max Ft Gnd Wire
Max Min Size (AWG) Wire Sizet (AWG)
2 5 14 63 14
5.8 14 26 14
8 0 . 12 30 14
115/1 126 104
3 3 • 14 48 14
6.6 14 24 14
8.8 12 27 14
Max Pus
Ampst
■|5
15
25
15
15
25
FLA — Full Load Amps
‘Permissible limits of the voltage range (for limited period of time) at
which the units will operate satisfactorily.
•(-Required when using nonmetallic conduit.
:j;Maximum dual element fuse size.
NOTES: 1
2 .
All units have 24-v control circuit which requires ex­
ternal power source.
Copper wire size in table based on 60 C. Use copper or
copper-clad aluminum wire. Use latest National Electri­
cal Code (NEC) for wire sizing.
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