A.Y. McDonald 7111, 7112 Installation Manual
Installation Instructions Installation Instructions
Angle Dual Check Backow
Preventers/Device
Meets requirements of ASSE 1024 and CSA B64.6 Meets requirements of ASSE 1024 and CSA B64.6
7111 & 7112 Series
Model Number Explanation
SPACE 1, 2, 3, & 4
Basic dual check valve model number:
7111 = Inline valve
7112 = Angle valve
SPACE 5
(–) Standard
R = Reverse direction of ow
W = Pentagon test plug in cap
SPACE 6
Dual check valve size:
3 = 3/4" 4 = 1"
SPACE 7
Inlet connection type:
A = Male meter thread integral
B = Male meter thread union
C = CTS (-22) Mac-Pak compression union
E = Female iron pipe integral
F = Female iron pipe union
G = CTS T - Series compression union
H = Meter swivel integral with saddle
J = Meter swivel integral
K = K-Style male thread integral
L = K-Style female thread union
M = Male iron pipe union
N = Meter female thread union
P = Male iron pipe thread integral
Q = K-Style male thread union
S = Male meter thread with O-ring seal integral
T = CTS T - Series compression integral
W = Yokebox Cradle
Y = Yoke style thread male integral
2 = CTS (-22) Mac-Pak compression integral
SPACE 8
Outlet connection type:
A = Male meter thread integral
B = Male meter thread union
C = CTS (-22) Mac-Pak compression union
G = CTS T - Series compression union
E = Female iron pipe integral
F = Female iron pipe union
H = Meter swivel integral with saddle
K = K-Style male tread integral
L = K-Style female thread union
M = Male iron pipe union
N = Meter female thread union
P = Male iron pipe thread integral
Q = CTS Q - Series compression integral
R = Copper are integral
T = CTS T - Series compression integral
V = CTS Q - Series compression integral
2 = CTS (-22) Mac-Pak compression integral
COMPONENTS and REPAIR PARTS COMPONENTS and REPAIR PARTS
O-ring O-ring
→ →
Inlet Inlet
→ →
O-ring repair part O-ring repair part
→ →
Inlet Inlet
O-ring
repair part
→
HOW TO ORDER HOW TO ORDER
UNIT REQUIRED (Example): UNIT REQUIRED (Example):
Order Model 7112-3HE43 Order Model 7112-3HE43
Space 1-4 Space 5 Space 6 Space 7 Space 8 Space 9 Space 10 Space 11 Space 1-4 Space 5 Space 6 Space 7 Space 8 Space 9 Space 10 Space 11
7112 - 3 H E 4 3 7112 - 3 H E 4 3
Reverse Flow Direction Reverse Flow DirectionStandard Flow Direction Standard Flow Direction
→
Insert spacer repair part Insert spacer repair part
→
O-ring O-ring
→
→
Bottom
check cartridge
→
Outlet Outlet
→
Insert spacer
O-ring O-ring
→ →
Inlet Inlet
→
→→
→
Insert spacer
repair part
→
Bottom
→
check cartridge
repair part
Outlet Outlet
O-ring
repair part
→
Outlet Outlet
SPACE 9
Blank
→
repair part
→
→
→
Bottom
check cartridge
O-ring repair part O-ring repair part
→
→
→
→
Inlet Inlet
→
O-ring O-ring
→
→
Outlet Outlet
→→
Insert spacer
repair part
→
Bottom
→
check cartridge
repair part
→
SPACE 10 & 11
Sizes for inlet (8) and outlet (9) connections:
1 = 1/2" 3 = 3/4" 5 = 1 1/4"
2 = 5/8" 4 = 1" 6 = 1 1/2"
Thread size of meter swivel nut:
METER THREAD METER
SIZE SIZE DESIGNATION
5/8 3/4" 3
5/8 x 3/4 1" 4
3/4 1" 4
1 1 1/4" 5
For Iron Yokes use the following designation:
METER THREAD METER
SIZE SIZE DESIGNATION
5/8 - 2
5/8 x 3/4 - 3
3/4 - 3
1 - 4
Not all sizes or combinations available
contact factory.
- Angle style valve - No test valve
- Valve size 3/4" - Outlet - FNPT integral 3/4"
- Inlet - Meter swivel integral with saddle (5/8 x 3/4 meter)
(Installation and test procedures on opposite side) (Installation and test procedures on opposite side)
800.292.2737 | FAX 800.832.9296 | sales@aymcdonald.com | aymcdonald.com 800.292.2737
10/14 10/143210-373 3210-373
Installation Instructions Installation Instructions
Angle Dual Check Backow
Preventers/Device
1. Use only for residential and mobile home supply service or individual outlets.
2. The device can be installed in any position.
3. The device shall be installed in an accessible location to facilitate the removal for servicing and testing.
4. Service lines should be thoroughly ushed before installing the device. Excessive pipe sealant or Teon tape
may foul checks. A suitable strainer should be installed upstream of the device.
5. DO NOT use Vaseline®, plumber's grease, or any other petroleum based product on seals or O-rings.
6. Insure that device is installed in proper ow direction. Refer to ow direction arrow on body.
7. Do not over-tighten O-ring cap seal or across body cylinder to avoid distortion.
8. Any sweat ttings must be completed before installing device.
9. A pressure relief valve or expansion tank is recommended downstream of device if thermal expansion
conditions are possible.
10. Use only on cold water services. Protect from freezing.
11. Refer to pressure and temperature ratings on device tag.
FIELD INSPECTION & TEST PROCEDURE FIELD INSPECTION & TEST PROCEDURE
A. DIS-ASSEMBLY
1. Remove the device cap.
2. Remove the two check assemblies using care not to damage device components.
3. Visually inspect seals, sealing surfaces, etc. for debris or damage.
B. TESTING
1. Insert top check assembly into A.Y. McDONALD angle test kit as shown in drawing.
2. Add water to test kit level to upper red line - 42 inches (1.5 PSIG).
3. Obser ve water level for up to 5 minutes until water level stabilizes.
Water level should not fall below lower red line - 28 inches (1.0 PSIG).
4. If water column falls below 28 inches the check assembly should be
cleaned and re-tested or replaced.
5. Repeat steps B1 - B4 for bottom check car tridge.
C. RE-ASSEMBLY
1. Clean and inspect device components.
2. Check car tridge O-rings should be lightly lubricated with a NSF approved
silicone lubricant.
3. Inser t check assemblies into body correctly corresponding to ow direction
on the device body.
4. Inser t spacer and re-assemble device cap. Do not over-tighten.
42" 42"
28" 28"
Contact factory for
test kit.
WARNING: It is unlawful in CALIFORNIA & VERMONT (effective 1/1/2010); MARYLAND (effective 1/1/2012); LOUISIANA (effective 1/1/2013)
and the UNITED STATES OF AMERICA (effective 1/4/2014) to use any product in the installation or repair of any public water system or any
plumbing in a facility or system that provides water for human consumption if the wetted surface area of the product has a weighted average lead
content greater than 0.25%. This prohibition does not extend to service saddles used in California, Louisiana or under USA Public Law 111-380.
800.292.2737 | FAX 800.832.9296 | sales@aymcdonald.com | aymcdonald.com 800.292.2737
10/14 10/143210-373 3210-373
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