How can we temporarily bypass a Burnham IQ outdoor reset?

Bypass the OD reset

Yes jumping terminals #&$ on the card will simulate and call for DHW and override the t-stat demand. The control also has priority built into it so the heat circulator will shut down.

Are they using deep night set back? If so reduce the degree of setback. How many zones? Maybe change the boost time on the ODR card.

Let's Think About This

You have o.d. reset to save energy and give better comfort, but you're also using setback for ??? Then coming out of set back, you want to disable the o.d. reset because it takes too long to recover for the old folks (even though the control has boost). Now you're considering simulating a domestic call to run the temp to 180* even though doing this will cause the boiler to continue to fire after the thermostat has turned off the circ. and there's no flow through the boiler? And you think all of this is a good idea??



Please tell me they don't let you have any sharp objects.

Bypassing ODR directly

Determine the OAT which will produce the water temp you want.  Check thermistor table for the correct value.  Find the nearest standard resistor value.  Buy one. Install SPDT relay and choose between ODR and setpoint.

The Scenario is Correct, No?

From what you've stated, I don't know how anything else could be deduced:

1. You have ODR. Its purpose is to save energy by matching supply temp to the actual load on the structure. This also produces greater comfort in the process. These are facts, though not stated by you.

2. You are using setback, even though you didn't directly say so, because you want to more rapidly warm up the heated area and the boost function is doing it in increments that are too small. That you did state and there can be no other way of interpreting that other than using setback. If I'm wrong, please show me and I'll apologize.

3. You are seeking a method to jury-rig something to get around the logic that Burnham placed in their control. Though you don't state it, that strongly implies they missed something in its design. Action speak louder than words.



What I was try to get you to see is your thinking and re-engineering attempt is flawed.



Please follow: ODR and setback are opposite approaches at reducing energy consumption. As I stated above, ODR reduces energy consumption by matching the supply water temp to the heat loss of the structure at any given o.d. temp. Greater comfort is a by-product. In fact, a properly designed and adjusted system with ODR almost doesn't need a thermostat, the logic of the control will provide just the right amount of heat. In case you doubt that, I've got one right next door that's been doing just that for weeks with no thermostat on it.



Setback, however, takes a vastly different approach. It simply turns the system off until the structure drops to a lower temp. Then, it attempts to return the structure to the higher temp when it is setup. If the setback is deep enough or long enough, there can be energy savings. Usually, not that much. But, it comes at the sacrifice of comfort. Just the opposite of ODR. This approach is counter-productive to ODR, totally.



The engineers at Burnham were more than knowledgeable enough to realize all this. They also realize that most Americans are wed to the antiquated idea that setback is the way to save and that many will attempt this even though it's fighting against the better technology of ODR. Their solution is the boost feature. It's a compromise between to waring approaches because they knew Americans would use setback. And, they're not the only manufacturer to offer it by any means. Although, most, if not all German mod/cons, do not offer it because they know it's counter-productive.



I've said all that to try to get you to see that it's your operational approach that's wrong, not the boiler's control system. Reduce or eliminate the setback and you'll have greater savings AND comfort. The boiler control doesn't need modifying.