© 2005 D 337 - 06/05 2 of 4
Sequence of Operation
Group A Group B
24 V (ac) R & C
tN4 Bus A
115 V (ac) L & N
Group BGroup A
Dual Zone Manager 337
Meets Class B: Canadian
ICES & FCC Part 15
Made in
Canada
Power Fuse: T15 A 250 V
15 A
Zone A1
Zone A2
Power
Zone Group Pump A
Zone A3
Zone B1
Zone B2
Zone B3
tN4
tektra 996-02
For product instructions, see brochure
Input Power: 115 V (ac) ±10% 60 Hz, 15.5 A
Relay Rating: 115 V (ac) 5 A
All Loads Using Input Power: 15 A
Caution! Disconnect All
Power before Opening
Limited power available, see wiring brochure
For product literature:
www.tekmarcontrols.com
Zone Group Pump B
1
2345678910111213141516 20
H7005B
32 33 34 35 36 37 38 39 40 41 42 43
17 18 19 21 22 23 24
25
26 27
24 V (ac) Fuse: T2.5 A 250 V
28 29 30
31
On/Off
Zone Group
Pump A Delay
Zone Group
Pump A
Zone Group
Pump B Delay
Zone Group
Pump B
A1
A2
A3
B1
B2
B3
A1
A2
A3
B1
B2
B3
tN4 C C CWWRRPmp tN4 tN4 C WRtN4 C WRRtN4 C WtN4 RCWtN4
Input Power Zn Grp Zn Grp Zone A1 Zone A2 Zone A3 Zone B1 Zone B2 Zone B3
Zn Grp B B tNt Zone A1 tNt Zone A2 tNt Zone A3 tNt Zone B1 tNt Zone B2 tNt Zone B3
N
L Pmp A Pmp B
C
Vlv
C
Vlv
C
Vlv
C
Vlv
C
Vlv
C
Vlv
Supply
/signal wires 90°C min.
24 V (ac) Powered Outputs
The 337 has an internal transformer that provides
powered outputs for up to six 24 V (ac) zone valves and
six thermostats.
The internal transformer has limited power available. Refer
to the Job Records to determine the load on the transformer.
If the load is too large for the transformer, refer to the Wiring
Brochure to add additional power to the system.
115 V (ac) Powered Outputs
The 337 has two internal relays that provide powered outputs
for two zone group pumps.
Refer to the Job Records to determine the allowable loads
for these relays.
Sequence of Operation
When a thermostat calls for heat, the Zone LED turns on
and power is supplied to the zone valve.
• If the Zone Group Pump DIP switch is set to On and the
Zone Group Pump Delay DIP switch is set to Off, the
Zone Group Pump LED and relay turn on.
• If the Zone Group Pump DIP switch is set to On and the
Zone Group Pump Delay DIP switch is set to On, the
Zone Group Pump LED and relay turn on three minutes
after the zone valve is powered.
• If the Zone Group Pump DIP switch is set to Off, the
Zone Group Pump LED and relay are not turned on.
tN4 Bus A and tN4 Bus B
The 337 provides two tN4 busses. All of the tN4 terminals
for the A zones are internally connected. All of the tN4
terminals for the B zones are internally connected. Each
bus also has its own Zone Group Pump relay.
Since there are two separate tN4 busses, the zones on bus
A can operate at a separate water temperature or at the
same water temperature as the zones on bus B.
If the zones on bus B are to operate at the same water
temperature as bus A, connect bus A and bus B together.
If the zones on bus B are to operate at a separate water
temperature than bus A, do not connect bus A and bus B
together.
Pump B Demand
To operate the Zone Group Pump B relay externally, a
powered signal must be sent to the Pmp B terminal on the
337. Refer to the Wiring Brochure for the proper wiring.
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