18
CIRCULATION PUMPS
NOTE: The direction of water flow is very
important for the proper operation of the outdoor
furnace. Installing a swing check valve in the
return line can prevent possible reverse flow.
Water Flow
For a single building using a water-to-air heat exchanger
system with a domestic water heater, the direction of
water flow must go from the hot outlet on the outdoor
furnace to the lower side fitting of the domestic water
heater exchanger, to the lower fitting of the heat
exchanger on the existing furnace, and then to the return
port of the outdoor furnace.
NOTE: if there is a high heat draw with a single set
of lines, a wraparound pump (as shown in Fig. 21)
may be needed in order to keep the supply water
temperature the same temperature indicated by
the FireStar controller.
NOTE: Some systems may have different flow
patterns.
Access to Ports on Furnace
Access to the hot supply and return ports is gained by
removing the access panels on the lower right-hand
side and back of the furnace. There are two hot supply
and two return ports on the furnace. This configuration
allows for mounting the circulation pumps on the
furnace (Fig. 22).
Fig. 22
1" CENTRAL PE
X
3/4
1" CENTRAL PE
X
3/4
1" CENTRAL PE
X
1" CENTRAL PE
X
1" CENTRAL PE
X
1" CENTRAL PE
X
Side View
Rear View
Return
Return
Supply
Supply
There are eight knock-out tabs on the floor panel of
the furnace to accommodate the water lines. These
align with the hollowed-out area in the foundation
specifications (Fig. 6). The pump access area in the back
right corner must align with the blocked out area of the
foundation.
Installing Circulation Pumps
The Taco 009 is a medium flow, high head pressure
pump that requires an adequate amount of pressure on
the outlet side to prevent the motor from overloading.
Maxim
with Wrap-around-pump Installed
1" CENTR
AL PEX
3/4
1" CENTR
AL PEX
3/4
1" CENTR
AL PEX
1" CENTR
AL PEX
1" CENTR
AL PEX
1" CENTR
AL PEX
Area of Focus
Side
Rear
Side
3/4
1"
CENTR
AL PEX
3/4
1"
CENTR
AL PEX
1"
CENTR
AL PEX
1"
CENTR
AL PEX
1"
CENTR
AL PEX
1"
CENTR
AL PEX
198
410 388
5800004
225
119
556
224
296
1334
5926
1330
118
Qty p/n Description
Parts List
1 198
Ball Valve, 3/4"
2 5800004 Taco 007 Pump
2 118
Close Nipple, 3/4"
1 119
Pump Flange Kit, 3/4"
1 410
Ball Valve, 1-1/4"
4 1330
PEX Adapter, 1" x 3/4"
1 224
Isolation Flange, 3/4"
1 225
Isolation Flange, 1-1/4"
1 388
Hex Bushing, 1-1/4" x 3/4"
2 556
Power Supply Cord, 32"
2 296
Swing Check Valve, 3/4"
4 1334
PEX 90° Elbow, 1"
12 5926
Stainless Steel Clamp, 1"
Parts and accessories sold separately.
Pump size may vary.
Side View
Rear View
Fig. 21
Section 6 - System Installation
