Reddit reviews Air Gas North Central Inc 90-340 White Rodgers Switching Relay
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Manufacturer Model 90-340Genuine Replacement PartWhite Rodgers itemCountry of Origin: China
Regarding the connection of the DH terminal to the NC terminal. Depending based on the wiring diagram that is on the relay, make sure the the terminal wired to R is on the other side of the switch. For example, in the relay I recommended https://smile.amazon.com/dp/B00ECX0FWO/ref=sxbs_sxwds-stvpv2_1?pf_rd_m=ATVPDKIKX0DER&pf_rd_p=3534659722&pd_rd_wg=DmHfT&pf_rd_r=VMHAX0BV3DW2EFSGH0D8&pf_rd_s=desktop-sx-bottom-slot&pf_rd_t=301&pd_rd_i=B00ECX0FWO&pd_rd_w=PstLc&pf_rd_i=DPDT+24vac+relay&pd_rd_r=bca85d26-c459-459f-be4d-7e8d679d7b14&ie=UTF8&qid=1524087357&sr=1 R should be wired to terminal 1 and 4, DH to terminal 2 or 5, O to terminal 3, Y to terminal 6.