tekmar 557 Thermostat Installation - Manual (Page 7)

© 2014 557_D - 09/14
7 of 52 A Watts Water Technologies Company
4. If the thermostat display is off, or is cycling on and off, move the thermostat to the
next available zone on the House Control, Wiring Center, or Zone Manager.
If the thermostat display remains permanently on, there may be a fault with the
previously tried zone on the House Control, Wiring Center, or Zone Manager.
If the thermostat display continues to be off, or is cycling on and off, there may
be a fault on the thermostat.
If a fault is suspected, contact your tekmar sales representative for assistance.
Testing tekmarNet ® 4 and Stand Alone Wiring -------------------------- --------------------------
Testing the Power
1. Remove the front cover from the thermostat.
2. Use an electrical test meter to measure (ac) voltage between the R and C terminals.
The reading should be 24 V (ac) +/– 10%.
3. Install the front cover.
Testing the Relay Outputs -------------------------------------------- --------------------------------------------
The thermostat includes a User Test to check if the thermostat’s relays are operating
and that the thermostat is wired correctly to the HVAC equipment. The User Test setting
can be located in the Toolbox menu. Either Heat or Cool test can be selected.
Cancel button - Exits the user test and returns the Toolbox menu.
Hold button - Pauses the user test step for up to 5 minutes.
Next Item button - Advances the user test to the next test step.
User Test Sequence
Heat Test Cool Test
Step Relay(s) Closed Step Relay(s) Closed
O Relay OFF Rc-O/B is opened O Relay ON Rc-O/B
B Relay ON Rc-O/B B Relay OFF Rc-O/B is opened
Fan Rc-G Fan Rc-G
Y1 Heat Rc-Y1 and Rc-G Y1 Cool Rc-Y1 and Rc-G
Y2 Heat Rc-Y1 and Rc-Y2 and
Rc-G Y2 Cool Rc-Y1 and Rc-Y2 and
Rc-G
W2 Heat Rh2-W2 W2 Cool Rh2-W2
W1 Heat Rh1-W1 Humidify* ACC-ACC
Humidify* ACC-ACC Dehumidify* ACC-ACC or Rc-Y2
Dehumidify* ACC-ACC or Rc-Y2 HRV* Rc-Y2
HRV* Rc-Y2 Valve* ACC-ACC or Rc-Y2
Valve* ACC-ACC or Rc-Y2
*availability of test step and additional relay closures based upon Setup menu settings.
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