flyboy013
RVF VIP
- Joined
- Jul 24, 2020
- Messages
- 389
- Location
- Naples, Florida
- RV Year
- 2018
- RV Make
- Newmar
- RV Model
- Mountain Aire 4531
- RV Length
- 45
- Chassis
- Spartan K3
- Engine
- Cummins ISX12 (500HP)
- TOW/TOAD
- 2023 Jeep GC Summit Reserve
- Fulltimer
- Yes
Here is a link to the service manual. Note that the bypass switch activates the pumps for the two heating zones and not the summer loop pump. The heat exchanger for the hot water is in the distribution box with the pumps and activating the two heat circulating pumps circulates the transfer enough to also provide hot water.
The bypass jumper (activated via a switch mounted on the top of the distribution module zone board) can be used in conjunction with a purge pump to initially fill the system with coolant. When this jumper is activated, the Loop 1 and Loop 2 pumps turn on and push coolant through the entire system. Once the system is filled and purged of air, the bypass switch must be turned OFF.