Carrier 28QX - Manual (Page 16)

BULB WELL
THERMISTOR
SENSOR
Fig. 18 — Thermistor Sensor and Bulb Well
Step 5b — Install Glycol Pump Package specified
by Carrier. Review System Requirements, pg 6.
The glycol system is composed of the same
components as the plain water system with dif­
ferences only in the pump and control package.
F o l l o w
same installation requirements and
recommendations indicated for the plain water
system including solar collector and storage tank
installation found in Steps 3 and 4.
MOUNT ON FLOOR — The glycol pump package
(Fig. 19) can be mounted directly on a floor. If the
floor space is subject to flooding, elevate the pump
package so that flood water cannot enter the unit.
Provide service access at the rear, front, top and
sides of unit as shown in Fig. 2.
MAKE WATER/GLYCOL PIPING CONNEC­
TIONS — Use water grade copper tubing or better.
Sweat all connections and joints with solder (95-5).
Tubing sizes for solar collector piping loop are
specified (by Carrier) for system. Tubing sizes for
Tri-X, coil water loop, heat exchanger loop and
domestic hot water preheating piping are shown
below. Size pipe connections are required on
Glycol systems. Fig. 2. Typical piping diagrams for
completed systems are shown in Fig. 23 and 24.
WATER CONN TO
STORAGE TANK
GLYCOL/WATER CONN.
TO SOLAR COLLECTORS'
GLYCOL/WATER i
HEAT
EXCHANGER
HEAT
EXCHANGER
PUMP (P
3 )
WATER CONN TO
'TRI-X COIL
, ^ , GLYCOL/WATER CONN. FROM
1 ^ ----- '^OLAR COLLECTORS
BALL VALVES
SOLAR
COLLECTOR
PUMP
(P2)
GLYCOL
LEVEL
SIGHT GLASS
WATER CONN. FROM STORAGE
TANK (PROVIDES HEAT)
Fig. 19 — Glycol Pump Package (Panels Removed)
Fig. 20 — Solar Collector Panel(s) Piping Loop
on Glycol System
Collector Loop (Fig. 20) — This loop begins at the
“collector return” stub at top of the pump package
(2-1/8 in. O.D. pipe). It travels thru the expansion
tank, pump and heat exchanger and out of the
pump package thru the “collector supply” stub
(1-1/8 in. OD). The glycol travels thru the collec­
tors and back thru the drain down pipe to the
beginning of the loop.
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