Carrier 38HQ User Manual

Number OneAi'rConditbninqMakerDivisiun uf Carrier CorporationCarrier Parkway • Syracuse NY 13221Weathermaster III Heat Pump(Outdoor Coil Section;

SERVICE’ Refrigerant Charging — The 38HQ940 outdoor coil contains a factory charge of 7.1 lb of R-22; the 38HQ960 outdoor coil conta

REFRIGERANT CHARGING AND CHECK CHARTSr.Fig. 10 — 38HQ120/38HQ940 with 40AQ030 or 28HQ.VQ030 Cooling Cycle Charging Chart (R-22)Fig. 12 — 38HQ127/38HQ9

Fig. 14 — 38HQ134/38HQ940 with 40AQ036 or 28HQ,VQ036 or 40FS160/ 28HQ,VQ036 Cooling Cycle Charging ChartSUCTION PRESSURE AT COMPRESSOR SERVICE PORT (P

Fig. 18 — 38HQ120/38HQ940 with 40AQ036 or 28HQ.VQ036 or 40FS160/28HQ,VQ036 Heating Cycle Operation Check ChartFig. 20 — 38HQ127/38HQ940 with 40AQ036 o

Fig. 22 — 38HQ140/38HQ960 with 28HQ,VQ042 or 40FS160/28HQ.VQ042 or 40FS200/28HQ,VQ042 or 40QB042 Heating Cycle Operation Check ChartFig. 23 — 38HQ146/

6. From intersect point, project vertically downward to chart suction pressure line. Compare chart suction pressure to unit suction

Fig. 25 — 38HQ Refrigerant Flow DiagramsDEFROST CONTROL, consisting of a defrost timer, defrost thermostat and defrost relay, interrupts

5. Slide piston out by inserting a small soft wire thru metering hole (18-gage thermostat wire). See that metering hole, sealing su

TROUBLESHOOTING CHART — COOLING CYCLE

TROUBLESHOOTING CHART — HEATING CYCLE

4-0" OVERHEAD SPACE REQUIRED FOR SERVICE AND AIRFLOW,M HOLE (OR l|- KO)LIQUID LINE CONNik-IfMTG SLOTS (USE ANY 2 TO BOLT UNIT DOWN)38HQOUTDOORCOI

(iKFor replacement items use Carrier Specified Parts.Manufacturer reserves the right to discontinue, or change at any time, specifications or designs

Table 3 ^ Carrier-Approved 38HQ SystemsINDOORCOMPROUTDOORCOILINDOOR FAN COILINDOORACCURATER™OUTDOOR ACCURATER iMAX HEIGHT (ft) INDOOR UNITSSECTIONPIST

does not obstruct drainage holes (holes drain water during heating and defrost cycles). Attach unit to pad with 1/4-in. mounting bol

Since it is lightweight, the outdoor unit can be mounted on a platform attached to or built out from structure. Construct platform

REPLACE THE ACCURATER™ REFRIGERANT CONTROL PISTON IN THE INDOOR AND OUTDOOR COIL AS REQUIRED before connecting refrigerant lines. See

Fig. 7 — Accessory CouplerSweat Connection to Compatible Fitting (Use refrigerant grade tubing.)1. Remove locking nut, rubber O-ring and S

CONNECT GROUND LEADS AND POWER WIRINGConnect ground leads to the ground lug in control box for safety. Connect power wiring. See Fig

THERMOSTAT 40AQ OR 40QB FAN COIL 38HQ SUBBASE COOLING CONTROL COMPRESSOR HH93AZ073 OR KIT SECTIONHH93AZ075 TERMINAL BOARD TERMINAL BOARDCOOLING AND